Test Bank For Electrical Principles 7Th Ed by Jim Jenneson

Multiple Choice Questions 1. The generation, supply and distribution subsector is responsible for electrical power generation, transmission and distribution from electrical power stations to: A. the first user B. the second user C. the end user D. the middle user 2. The generation, supply and distribution subsector employs a range of people, including: A. electrical engineers and operators, electrical lines workers and electricians B. mechanical engineers and operators, electrical lines workers and electricians C. civil engineers and operators, electrical lines workers and electricians D. electronic engineers and operators, electrical lines workers and electricians 3. Electrical professionals design, construct and maintain: A. the human network B. the electronics work C. the mobile network D. the electrical network 141A-1 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. UEENEEE141A Testbank 4. Who employs many electricians to install and maintain machinery and electrical wiring and equipment to industrial installations, factories and mining sites? A. The industrial and mining subsector B. The government and mining subsector C. The civil and mining subsector D. The mechanical and mining subsector 5. The industrial and mining subsector also includes instrumentation, which is the installation, maintenance and calibration of instruments used in processing and manufacturing to measure data such as: A. voltage, current, time rates, temperature and torque B. power, current, flow rates, temperature and location C. voltage, current, flow rates, temperature and location D. voltage, current, flow rates, frequency and location 6. Control wiring and equipment is used to regulate motors, valves and other devices used in electrical equipment such as: A. mixer grinders B. conveyor belts, smelters, lifts and escalators C. drillers D. None of the given answers are correct 7. The commercial and domestic construction and maintenance subsectors both employ licensed: A. electricians B. mechanist s C. artist s D. civil people 141A-2 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 8. Offices, large retail outlets, shops, restaurants, hotels and like comprise: A. the domestic subsector B. the electrical subsector C. the commercial subsector D. the common subsector 9. Residential dwellings are categorised under: A. the electrical subsector B. the commercial subsector C. the common subsector D. the domestic subsector 10. The electronics industry is similar to the electrical industry in that both require people with a: A. high level of electronics-related knowledge and skills B. high level of electricity-related knowledge and skills C. high level of electromechanical-related knowledge and skills D. high level of mechanical- and civil-related knowledge and skills 11. Which field involves the installation of cable and optical fibre across the country? A. Data and telecommunications B. Radio communications C. Industrial electronics D. Computer systems 141A-3 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 12. Which field involves the installation, servicing and maintenance of IT equipment? A. Data and telecommunications B. Radio communications C. Industrial electronics D. Computer systems 13. Which field involves servicing, maintenance and repair of photocopiers, cash registers and similar equipment used in offices and retail outlets? A. Commercial electronics B. Consumer electronics C. Industrial electronics D. Computer systems 14. Which field involves the servicing, maintenance and repair of electronic equipment such as televisions and microwaves? A. Commercial electronics B. Consumer electronics C. Industrial electronics D. Computer systems 15. Which field involves the installation, servicing and maintenance of commercial and domestic equipment such as CCTV, infrared and motion detectors and X-ray scanners? A. Industrial electronics B. Computer systems C. Security systems D. Commercial electronics 141A-4 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 16. How many types of circuit can be categorised their complexity? A. One B. Four C. Three D. Five 17. The source is simply where: A. the current comes from B. the energy comes from C. the power comes from D. the voltage comes from 18. The load is which part of the circuit? A. The receiving part B. The working part C. The source part D. The sending part 19. When there is no voltage present, electrons wander around the metallic conductor: A. in a random manner, with no particular direction B. in an even manner, with no particular direction C. in a random manner, with particular direction D. in a random manner, with opposite direction 141A-5 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 20. When a voltage is placed across two points of a solid conductor: A. the photons will migrate away from the positive of the supplied voltage and towards the negative of the supplied voltage B. the electrons will migrate towards negative of the supplied voltage and away from the positive of the supplied voltage C. the electrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage D. the neutrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage 21. Before electrons were known of, the (arbitrary) convention was that current flowed from: A. negative to negative B. positive to positive C. negative to positive D. positive to negative 22. Which is a pictorial method of recording the connections of a circuit quickly, simply and in a way that is easy to understand? A. Circle diagrams B. Circuit diagrams C. Flow diagrams D. Gap diagrams 23. A circuit drawn by one person must be able to be easily read by others who know the: A. standards B. idea s C. current D. design 141A-6 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 24. The symbols generally represent: A. a picture B. a picture rather than a concept C. a concept rather than a picture D. a concept and a picture 25. Components are labelled: A. from right to left and top to bottom B. from left to right and bottom to top C. from right to left and bottom to top D. from left to right and top to bottom 26. The discrepancy in ammeter readings can be ignored: A. when the resistor has a comparatively high value of resistance when compared with the voltmeter resistance B. when the resistor has a comparatively low value of resistance when compared with the voltmeter resistance C. when the resistor has a comparatively high value of resistance when compared with the wattmeter resistance D. when the inductor has a comparatively low value of inductance when compared with the voltmeter resistance 27. The resistances on a bridge read R1 = 10 kΩ, R2 = 1 kΩ and R3 = 3.95 kΩ. Find the value of the resistance being measured. A. 38.20 kΩ B. 36.20 kΩ C. 39.50 kΩ D. 37.45 kΩ 141A-7 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 28. In some cases or emergencies, even a flashing warning light might not draw enough attention, so: A. an alarm is sounded B. a motor starts to run C. a generator fails to run D. None of the given answers are correct 29. In a typical domestic home, the smaller wattage lamp always has the: A. lowest voltage across it B. highest resistance C. lowest resistance D. highest voltage across it 30. Which tester reads both a.c. and d.c. up to voltages of 500 V? A. An electronic-based voltage detector B. A plug-style tester C. A vibrating tester D. An electrical-based voltage detector 31. Many instruments used today incorporate a multitude of different test functions that include a(n): A. electronic-based voltage detector B. plug-style tester C. vibrating tester D. electrical-based voltage detector 141A-8 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 32. The logic probe will operate satisfactorily at: A. 20 MHz B. 20 Hz C. 20 KHz D. 40 MHz 33. Either current or voltage ranges being exceeded is called: A. under load B. full load C. overload D. no load 34. an ammeter connected across a voltage source is an example of: A. a wrong connection B. a tee connection C. a ring connection D. a right connection 35. When checking an unknown voltage (or current), always start with: A. the approximate range B. the medium range C. the highest range D. the lowest range 36. Only commercially produced test lamps pass the safety conditions required by: A. AS/NZS 61010, IEC 6664 and various relevant state acts and regulations B. AS/NZS 61010, IEC 61010and various relevant state acts and regulations C. AS/NZS 6110, IEC 60664 and various relevant state acts and regulations D. AS/NZS 6110, IEC 6066 and various relevant state acts and regulations 141A-9 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 37. Which is a registered trade name of an analogue multimeter? A. AOV B. VOA C. AVO D. VAO 38. Which type of meter is quite sensitive and often gives a full-scale deflection with a current of microamperes? A. Modern multimeters B. Modern ammeters C. Older ammeters D. The first ammeter ever invented 39. A digital multimeter is similar to an analogue multimeter, the only major difference being that the meter movement is replaced with a(n): A. analogue converter B. dual converter C. semi converter D. digital converter 40. The LCD display of a meter generally has: A. a front-lit function to allow it to be read in low light B. a front-lit function to allow it to be read in high light C. a back-lit function to allow it to be read in low light D. a back-lit function to allow it to be read in high light 141A-10 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 41. A digital multimeter is subject to large errors in the presence of a: A. radio-frequency field B. audio-frequency field C. power-frequency field D. high-frequency field 42. A digital device takes: A. more days to respond to the new value and settle again B. less time to respond to the new value and settle again C. a longer time to respond to the new value and settle again D. a longer time to respond to the old value 43. Clamp action meters are generally used to measure: A. voltage without having to interrupt the circuit being tested B. power without having to interrupt the circuit being tested C. frequency without having to interrupt the circuit being tested D. currents without having to interrupt the circuit being tested 44. Which instrument has a moving needle and can measure continuously changing values quickly and easily? A. An analogue instrument B. A digital instrument C. A musical instrument D. An optical instrument 141A-11 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 45. The face of the moving needle meter is calibrated to reflect: A. the power value caused by a certain voltage or current B. the speed value caused by a certain voltage or current C. the torque value caused by a certain voltage or current D. the power-factor value caused by a certain voltage or current 46. Which instruments have the ability to connect wirelessly via Bluetooth, Wi-Fi or mobile data? A. Modern microcontroller instruments B. Modern microprocessor instruments C. Analogue instruments D. Digital instruments 47. When used as an insulation tester, the bridge IR tester is a direct-reading series ohmmeter for: A. high-resistance values B. low-resistance values C. medium-resistance values D. constant-resistance values 48. The magnetic field tends to take the path of: A. highest magnetic resistance B. variable magnetic resistance C. least magnetic resistance D. constant magnetic resistance 141A-12 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 49. Magnetic shields in sensitive instruments are often made of a material known as ‘Mu-metal', which is a: A. nickel-chromium alloy B. nickel-iron alloy C. nickel-cobalt alloy D. nickel-aluminium alloy 50. Reed switches consist of two: A. ferrite magnetic wires B. ferromagnetic wires C. hard magnetic wires D. non-magnetic wires 51. When current travels along a conductor, a magnetic field: A. produces along the conductor B. surrounds the conductor C. opposes the current flowing through the conductor D. will not produce along the conductor 52. If the flux around two straight conductors carrying current is in the same direction, then the flux of each conductor unites to form a single flux: A. around both conductors B. between both conductors C. towards both conductors D. away from both conductors 141A-13 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 53. If a straight conductor is bent to form a loop, the strength of the flux inside the loop is due to the magnetic field generated by: A. the left side of the loop B. the right side of the loop C. each side of the loop D. the left or right side of the loop 54. The EMF generated in a coil can be determined by: A. e = Blv cosθ B. e = Blv sinθ C. e = Bl sinθ D. e = Bl cosθ 55. In electric circuits, ‘inductance' is the property of a circuit which creates: A. electromagnetic induction B. magnetic induction C. electric induction D. circuit inductance 56. The movement of pointer in a moving coil meter can work satisfactorily on: A. alternating current B. direct current C. both direct current and alternating current D. less than 2 volts of direct current 141A-14 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 57. What is the value of a multiplier if the voltage range of a moving coil meter needs to be extended up to 10 V? The internal resistance of the meter is 100 Ω and FSD occurs at 1mA. A. 10 Ω B. 100 KΩ C. 100 Ω D. 10 KΩ 58. The voltage range of a moving iron meter can be increased by using a: A. series resistor B. parallel resistor C. variable resistor D. variable voltage source 59. Relays are any set of contacts that are operated by a solenoid coil: A. electromagneticall y B. magneticall y C. electricall y D. mechanically 60. The mechanism of a contactor is the same as that of a relay, but is usually meant to operate: A. a d.c. circuit B. an a.c. circuit C. both a.c. and d.c. circuits D. mechanical circuits 141A-15 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 61. A contactor is essentially; A. a manual switch B. a smaller version of a relay C. a larger, higher current-carrying relay D. a semiconductor device 62. The operating principle of a d.c. motor is: A. when the two magnetic fields interact, the resulting magnetic field will produce a force B. a conductor moving in a magnetic field will experience a potential difference C. a stationary conductor in a magnetic field will experience a potential difference D. a current flowing through a conductor will produce a mechanical torque 63. Copper loss in a d.c. machine is influenced by: A. current through the coil B. voltage across the coil C. flux linking with the coil D. the rotating speed of the coil 64. Which of the following causes iron loss in a d.c. machine? A. Armature current B. Eddy current C. Load current D. Brush current 65. What does a coil of wire need to do within a magnetic field to produce a waveform with a positive voltage for one half-revolution and a negative voltage for a second half-revolution? A. Rotate B. Vibrate C. Move horizontally D. Move vertically 141A-16 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 66. If two inductors are connected in parallel across the a.c. supply, the total inductive reactance of the circuit is reduced in proportion to the: A. increase in supply voltage B. reduction in current C. reduction in supply voltage D. increase in current 67. When an a.c. voltage is applied to a capacitor, current flows in and out of the capacitor at a regular rate, dependent on the: A. supply frequency B. magnitude of supply voltage C. magnitude of current D. value of the capacitor 68. If we connect an inductor in series with an existing inductor, the current flowing in the circuit will experience: A. reduced opposition B. zero opposition C. no difference in opposition D. increased opposition 69. On a.c., the change in current flow produces an induced EMF that opposes it. The effect of this current opposition is called: A. inductive reactance B. capacitive reactance C. inductive resistance D. inductance 141A-17 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 70. The value of either a voltage or current waveform expressed at only one instant of time is called the: A. instantaneous value B. average value C. RMS value D. peak value 71. The frequency of a wave is the number of times a wave: A. repeats itself in one minute B. repeats itself in one second C. repeats itself in one micro second D. repeats itself in one millisecond 72. Alternating current (a.c.) is generated when a loop conductor, or coil, is rotated within a: A. magnetic field which has constant flux density B. distorted magnetic field C. uniform magnetic field D. time varying magnetic field 73. The function of tap changer in a transformer auxiliary equipment is: A. to change output voltage B. to change input voltage C. to change input current D. to change input voltage 141A-18 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 74. The function of a Buchholz relay in a transformer auxiliary equipment is to: A. detect water bubbles caused by an internal fault B. detect water bubbles caused by an external fault C. detect gas bubbles caused by an internal fault D. detect gas bubbles caused by an external fault 75. The purpose of the core in a transformer auxiliary equipment is to: A. provide a path for the electric field B. provide a path for the armature current C. provide a path for the field current D. provide a path for the magnetic field 76. What is the secondary current of a transformer that has 450 primary turns and 25 secondary turns when it draws a current of 4 A from the supply? A. 4 A B. 72 A C. 222 mA D. 25 A 77. The efficiency of a transformer can be calculated by: A. output/input B. input/ output C. output/(input + losses) D. output/(output -losses) 141A-19 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 78. The symbol of which type of inductor has a solid line? A. An air-cored inductor B. A ferrite-cored indictor C. A laminated-iron-cored inductor D. An epoxy-resin-cored inductor 79. If there is no solid or dashed line in the inductor symbol, this often means that it is a(n): A. air-cored inductor B. ferrite-cored indictor C. laminated-iron-cored inductor D. iron-powder-cored inductor 80. What type of inductor has a ceramic iron core? A. An air-cored inductor B. A ferrite-cored indictor C. An iron-cored inductor D. An Iron-powder-cored inductor 81. Autotransformers, like other transformers, may be step-up or step-down, meaning the secondary may be: A. a higher or lower voltage than the primary voltage B. an always-lower voltage than the primary voltage C. an always-higher voltage than the primary voltage D. the same as the primary voltage 141A-20 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 82. Standard AS/NZS3000 indicates the: A. limitations placed on the use of step-up transformers for general use B. limitations placed on the use of step-down transformers for general use C. limitations placed on the use of autotransformers for general use D. limitations placed on the use of isolation transformers for general use 83. Which transformer has an equal number of turns on the primary and secondary windings? A. An instrument transformer B. An isolation transformer C. An autotransformer D. None of the given answers are correct 84. What control technique can be used to limit the amount of current delivered to a welding rod? A. Changing the resistance B. Changing the capacitance C. Changing the conductance D. Changing the flux 85. The primary of a transformer winding is connected to the: A. electrical supply B. electrode supply C. electrical load D. battery 141A-21 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 86. The secondary of a transformer winding is connected to the: A. electrical supply B. electrode supply C. electrical load D. battery 87. Mutual induction is the operating principle of a: A. motor B. generator C. alternator D. transformer 88. The standard for current transformers (IEC 60044 (AS 60044)) specifies: A. one value for current range—5 A B. two values for current range—1 A and 5 A C. three values for current range—1 A, 2 A and 5 A D. four values for current range—1 A, 2 A, 5A and 10 A 89. For single-phase work, AS/NZS1243 specifies a secondary voltage of a potential transformer to be: A. 110 V B. 220V C. 230V D. 120V 90. An autotransformer is limited to a secondary voltage of: A. ± 20% of the primary voltage B. ± 22% of the primary voltage C. ± 28% of the primary voltage D. ± 25% of the primary voltage 141A-22 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 91. VDR is commonly used to protect home appliances from: A. voltage surges B. lightning C. discharge D. high current 92. An ESR meter is used to test a(n): A. inductor B. resisto r C. capacito r D. wire 93. The power curve in a parallel resistive circuit is sinusoidal in shape, which agrees with the laws of: A. trigonometry B. super position C. homogeneity D. linearity 94. The power in a parallel resistive circuit consists of: A. only negative values B. only positive values C. equal positive and negative values D. unequal positive and negative values 141A-23 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 95. If values of IRMS = 1 A and VRMS = 1 V, the power used in the parallel resistive circuit is: A. 2W B. 0W C. 1W D. 0.5W 96. For circuits that have both resistance and reactance, the product of the measured line voltage and line current produces a value greater than the power consumed. Therefore, it cannot be expressed in watts. The value is known as the: A. true power B. apparent power C. reactive power D. useful power 97. Apparent power is measured in: A. volt-amperes (VA) B. watts (W) C. kilowatts (kW) D. watt-amperes (WA) 98. The total current in a parallel R-L circuit does what by an angle φ? A. Leads the supply voltage B. Lags the supply voltage C. Leads the resistor current D. Lags the inductor current 99. The total current in a parallel R-L circuit is equal to: A. phasor difference of IR and IL B. IR C. IL D. phasor addition of IR and IXL+R 141A-24 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 100.Which is the reference phasor of a parallel R-L circuit? A. current flowing through the resistor IR B. current flowing through the inductor IR C. total current ITotal D. supply voltage V 141A-25 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. UEENEEE141A Testbank Answer Key Multiple Choice Questions 1. The generation, supply and distribution subsector is responsible for electrical power generation, transmission and distribution from electrical power stations to: A. thefirstuser B. the second user C. the end user D. themiddleuser Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 2. The generation, supply and distribution subsector employs a range of people, including: A. electrical engineers and operators, electrical lines workers and electricians B. mechanicalengineersandoperators,electricallinesworkersand electricians C. civil engineers and operators, electrical lines workers and electricians D. electronic engineers and operators, electrical lines workers and electricians Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 3. Electrical professionals design, construct and maintain: A. the human network B. theelectronicswork C. themobilenetwork D. the electrical network Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises 141A-26 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 4. Who employs many electricians to install and maintain machinery and electrical wiring and equipment to industrial installations, factories and mining sites? A. The industrial and mining subsector B. The government and mining subsector C. The civil and mining subsector D. The mechanical and mining subsector Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 5. The industrial and mining subsector also includes instrumentation, which is the installation, maintenance and calibration of instruments used in processing and manufacturing to measure data such as: A. voltage, current, time rates, temperature and torque B. power, current, flow rates, temperature and location C. voltage, current, flow rates, temperature and location D. voltage, current, flow rates, frequency and location Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 6. Control wiring and equipment is used to regulate motors, valves and other devices used in electrical equipment such as: A. mixer grinders B. conveyor belts, smelters, lifts and escalators C. drillers D. Noneofthegivenanswersarecorrect Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-27 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 7. The commercial and domestic construction and maintenance subsectors both employ licensed: A. electricians B. mechanists C. artists D. civilpeople Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 8. Offices, large retail outlets, shops, restaurants, hotels and like comprise: A. the domestic subsector B. theelectricalsubsector C. the commercial subsector D. the common subsector Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 9. Residential dwellings are categorised under: A. the electrical subsector B. thecommercialsubsector C. the common subsector D. the domestic subsector Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 10. The electronics industry is similar to the electrical industry in that both require people with a: A. high level of electronics-related knowledge and skills B. high level of electricity-related knowledge and skills C. high level of electromechanical-related knowledge and skills D. high level of mechanical- and civil-related knowledge and skills Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-28 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 11. Which field involves the installation of cable and optical fibre across the country? A. Data and telecommunications B. Radio communications C. Industrialelectronics D. Computersystems Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 12. Which field involves the installation, servicing and maintenance of IT equipment? A. Data and telecommunications B. Radio communications C. Industrialelectronics D. Computersystems Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 13. Which field involves servicing, maintenance and repair of photocopiers, cash registers and similar equipment used in offices and retail outlets? A. Commercial electronics B. Consumerelectronics C. Industrialelectronics D. Computersystems Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 14. Which field involves the servicing, maintenance and repair of electronic equipment such as televisions and microwaves? A. Commercial electronics B. Consumerelectronics C. Industrialelectronics D. Computersystems Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises 141A-29 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 15. Which field involves the installation, servicing and maintenance of commercial and domestic equipment such as CCTV, infrared and motion detectors and X-ray scanners? A. Industrial electronics B. Computersystems C. Security systems D. Commercial electronics Topic: T-point: T1 Electrical concepts, encompassing electrical supply and distribution within a building or premises Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 16. How many types of circuit can be categorised their complexity? A. One B. Four C. Three D. Five 17. The source is simply where: A. the current comes from B. the energy comes from C. thepowercomesfrom D. the voltage comes from Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 18. The load is which part of the circuit? A. The receiving part B. The working part C. Thesourcepart D. The sending part Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-30 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 19. When there is no voltage present, electrons wander around the metallic conductor: A. in a random manner, with no particular direction B. in an even manner, with no particular direction C. in a random manner, with particular direction D. in a random manner, with opposite direction Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 20. When a voltage is placed across two points of a solid conductor: A. the photons will migrate away from the positive of the supplied voltage and towards the negative of the supplied voltage B. theelectronswillmigratetowardsnegativeofthesuppliedvoltageandawayfromthepositiveof the supplied voltage C. the electrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage D. the neutrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 21. Before electrons were known of, the (arbitrary) convention was that current flowed from: A. negative to negative B. positive to positive C. negative to positive D. positive to negative Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-31 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 22. Which is a pictorial method of recording the connections of a circuit quickly, simply and in a way that is easy to understand? A. Circle diagrams B. Circuitdiagrams C. Flowdiagrams D. Gap diagrams Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 23. A circuit drawn by one person must be able to be easily read by others who know the: A. standards B. ideas C. current D. design Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 24. The symbols generally represent: A. a picture B. a picture rather than a concept C. a concept rather than a picture D. a concept and a picture Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 25. Components are labelled: A. from right to left and top to bottom B. from left to right and bottom to top C. from right to left and bottom to top D. from left to right and top to bottom Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-32 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 26. The discrepancy in ammeter readings can be ignored: A. when the resistor has a comparatively high value of resistance when compared with the voltmeter resistance B. when the resistor has a comparatively low value of resistance when compared with the voltmeter resistance C. when the resistor has a comparatively high value of resistance when compared with the wattmeter resistance D. when the inductor has a comparatively low value of inductance when compared with the voltmeter resistance Topic: T-point: T1 Electrical concepts, encompassing arrangement of circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 27. resistance being measured. The resistances on a bridge read R1 = 10 kΩ, R2 = 1 kΩ and R3 = 3.95 kΩ. Find the value of the A. 38.20 kΩ B. 36.20 kΩ C. 39.50 kΩ D. 37.45 kΩ Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 28. In some cases or emergencies, even a flashing warning light might not draw enough attention, so: A. an alarm is sounded B. a motor starts to run C. a generator fails to run D. Noneofthegivenanswersarecorrect Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-33 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 29. In a typical domestic home, the smaller wattage lamp always has the: A. lowest voltage across it B. highestresistance C. lowestresistance D. highest voltage across it Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 30. Which tester reads both a.c. and d.c. up to voltages of 500 V? A. An electronic-based voltage detector B. Aplug-styletester C. Avibratingtester D. An electrical-based voltage detector Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 31. Many instruments used today incorporate a multitude of different test functions that include a(n): A. electronic-basedvoltagedetector B. plug-styletester C. vibratingtester D. electrical-based voltage detector Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 32. The logic probe will operate satisfactorily at: A. 20 MHz B. 20 Hz C. 20 KHz D. 40 MHz Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits 141A-34 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 33. Either current or voltage ranges being exceeded is called: A. under load B. fullload C. overload D. no load Topic: T-point: T1 Electrical concepts, encompassing hazards associated with electrical systems and apparatus Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 34. an ammeter connected across a voltage source is an example of: A. a wrong connection B. ateeconnection C. a ring connection D. arightconnection Topic: T-point: T1 Electrical concepts, encompassing hazards associated with electrical systems and apparatus Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 35. When checking an unknown voltage (or current), always start with: A. the approximate range B. themediumrange C. the highest range D. the lowest range Topic: T-point: T1 Electrical concepts, encompassing hazards associated with electrical systems and apparatus Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-35 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 36. Only commercially produced test lamps pass the safety conditions required by: A. AS/NZS 61010, IEC 6664 and various relevant state acts and regulations B. AS/NZS 61010, IEC 61010and various relevant state acts and regulations C. AS/NZS 6110, IEC 60664 and various relevant state acts and regulations D. AS/NZS 6110, IEC 6066 and various relevant state acts and regulations Topic: T-point: T1 Electrical concepts, encompassing protection for safety requirements and their practice Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 37. Which is a registered trade name of an analogue multimeter? A. AOV B. VOA C. AVO D. VAO Topic: T-point: T1 Electrical concepts, encompassing protection for safety requirements and their practice Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 38. Which type of meter is quite sensitive and often gives a full-scale deflection with a current of microamperes? A. Modern multimeters B. Modernammeters C. Olderammeters D. The first ammeter ever invented Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-36 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 39. A digital multimeter is similar to an analogue multimeter, the only major difference being that the meter movement is replaced with a(n): A. analogue converter B. dualconverter C. semiconverter D. digitalconverter Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 40. The LCD display of a meter generally has: A. a front-lit function to allow it to be read in low light B. a front-lit function to allow it to be read in high light C. a back-lit function to allow it to be read in low light D. a back-lit function to allow it to be read in high light Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 41. A digital multimeter is subject to large errors in the presence of a: A. radio-frequency field B. audio-frequencyfield C. power-frequencyfield D. high-frequency field Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-37 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 42. A digital device takes: A. more days to respond to the new value and settle again B. less time to respond to the new value and settle again C. a longer time to respond to the new value and settle again D. a longer time to respond to the old value Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 43. Clamp action meters are generally used to measure: A. voltage without having to interrupt the circuit being tested B. power without having to interrupt the circuit being tested C. frequency without having to interrupt the circuit being tested D. currents without having to interrupt the circuit being tested Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 44. Which instrument has a moving needle and can measure continuously changing values quickly and easily? A. An analogue instrument B. Adigitalinstrument C. Amusicalinstrument D. An optical instrument Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-38 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 45. The face of the moving needle meter is calibrated to reflect: A. the power value caused by a certain voltage or current B. the speed value caused by a certain voltage or current C. the torque value caused by a certain voltage or current D. the power-factor value caused by a certain voltage or current Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 46. Which instruments have the ability to connect wirelessly via Bluetooth, Wi-Fi or mobile data? A. Modern microcontroller instruments B. Modernmicroprocessorinstruments C. Analogueinstruments D. Digitalinstruments Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 47. When used as an insulation tester, the bridge IR tester is a direct-reading series ohmmeter for: A. high-resistance values B. low-resistancevalues C. medium-resistancevalues D. constant-resistance values Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-39 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 48. The magnetic field tends to take the path of: A. highestmagneticresistance B. variablemagneticresistance C. least magnetic resistance D. constant magnetic resistance Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 49. Magnetic shields in sensitive instruments are often made of a material known as ‘Mu-metal', which is a: A. nickel-chromiumalloy B. nickel-iron alloy C. nickel-cobaltalloy D. nickel-aluminiumalloy Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 50. Reed switches consist of two: A. ferrite magnetic wires B. ferromagneticwires C. hardmagneticwires D. non-magneticwires Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 51. When current travels along a conductor, a magnetic field: A. produces along the conductor B. surroundstheconductor C. opposes the current flowing through the conductor D. will not produce along the conductor Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-40 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 52. If the flux around two straight conductors carrying current is in the same direction, then the flux of each conductor unites to form a single flux: A. around both conductors B. between both conductors C. towards both conductors D. away from both conductors Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 53. If a straight conductor is bent to form a loop, the strength of the flux inside the loop is due to the magnetic field generated by: A. theleftsideoftheloop B. therightsideoftheloop C. eachsideoftheloop D. theleftorrightsideofthe loop Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 54. The EMF generated in a coil can be determined by: A. e=Blvcosθ B. e=Blvsinθ C. e=Blsinθ D. e=Blcosθ Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 55. In electric circuits, ‘inductance' is the property of a circuit which creates: A. electromagnetic induction B. magneticinduction C. electricinduction D. circuit inductance Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-41 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 56. The movement of pointer in a moving coil meter can work satisfactorily on: A. alternating current B. directcurrent C. both direct current and alternating current D. less than 2 volts of direct current Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 57. What is the value of a multiplier if the voltage range of a moving coil meter needs to be extended up to 10 V? The internal resistance of the meter is 100 Ω and FSD occurs at 1mA. A. 10 Ω B. 100 KΩ C. 100 Ω D. 10 KΩ Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 58. The voltage range of a moving iron meter can be increased by using a: A. series resistor B. parallelresistor C. variableresistor D. variable voltage source Topic: T-point: T1 Electrical concepts, encompassing measurement and calculation of voltage, current, resistance and power in practical circuits Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-42 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 59. Relays are any set of contacts that are operated by a solenoid coil: A. electromagneticall y B. magnetically C. electrically D. mechanically Topic: T-point: T1 Electrical concepts, encompassing protection for safety requirements and their practice Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 60. The mechanism of a contactor is the same as that of a relay, but is usually meant to operate: A. a d.c. circuit B. it C. both a.c. and d.c. circuits D. mechanical circuits Topic: T-point: T1 Electrical concepts, encompassing protection for safety requirements and their practice Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 61. A contactor is essentially; A. amanualswitch B. asmallerversionofarelay C. a larger, higher current-carrying relay D. a semiconductor device Topic: T-point: T1 Electrical concepts, encompassing protection for safety requirements and their practice Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 62. The operating principle of a d.c. motor is: A. when the two magnetic fields interact, the resulting magnetic field will produce a force B. a conductor moving in a magnetic field will experience a potential difference C. a stationary conductor in a magnetic field will experience a potential difference D. a current flowing through a conductor will produce a mechanical torque Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-43 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 63. Copper loss in a d.c. machine is influenced by: A. current through the coil B. voltageacrossthecoil C. flux linking with the coil D. the rotating speed of the coil Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 64. Which of the following causes iron loss in a d.c. machine? A. Armature current B. Eddy current C. Loadcurrent D. Brush current Topic: T-point: T1 Electrical concepts, encompassing concepts and applications of magnetism and electromagnetic induction Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 65. What does a coil of wire need to do within a magnetic field to produce a waveform with a positive voltage for one half-revolution and a negative voltage for a second half-revolution? A. Rotate B. Vibrate C. Movehorizontally D. Move vertically Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 66. If two inductors are connected in parallel across the a.c. supply, the total inductive reactance of the circuit is reduced in proportion to the: A. increase in supply voltage B. reduction in current C. reduction in supply voltage D. increase in current Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-44 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 67. When an a.c. voltage is applied to a capacitor, current flows in and out of the capacitor at a regular rate, dependent on the: A. supply frequency B. magnitude of supply voltage C. magnitudeofcurrent D. valueofthecapacitor Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 68. If we connect an inductor in series with an existing inductor, the current flowing in the circuit will experience: A. reduced opposition B. zeroopposition C. no difference in opposition D. increased opposition Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 69. On a.c., the change in current flow produces an induced EMF that opposes it. The effect of this current opposition is called: A. inductive reactance B. capacitivereactance C. inductiveresistance D. inductance Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 70. The value of either a voltage or current waveform expressed at only one instant of time is called the: A. instantaneous value B. averagevalue C. RMSvalue D. peak value Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-45 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 71. The frequency of a wave is the number of times a wave: A. repeats itself in one minute B. repeats itself in one second C. repeats itself in one micro second D. repeats itself in one millisecond Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 72. Alternating current (a.c.) is generated when a loop conductor, or coil, is rotated within a: A. magnetic field which has constant flux density B. distorted magnetic field C. uniformmagneticfield D. timevaryingmagneticfield Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 73. The function of tap changer in a transformer auxiliary equipment is: A. to change output voltage B. to change input voltage C. to change input current D. to change input voltage Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 74. The function of a Buchholz relay in a transformer auxiliary equipment is to: A. detect water bubbles caused by an internal fault B. detect water bubbles caused by an external fault C. detect gas bubbles caused by an internal fault D. detect gas bubbles caused by an external fault 141A-46 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 75. The purpose of the core in a transformer auxiliary equipment is to: A. provideapathfortheelectricfield B. provideapathforthearmature current C. provide a path for the field current D. provideapathforthemagneticfield Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 76. What is the secondary current of a transformer that has 450 primary turns and 25 secondary turns when it draws a current of 4 A from the supply? A. 4 A B. 72 A C. 222 mA D. 25 A 77. The efficiency of a transformer can be calculated by: A. output/input B. input/output C. output/(input+losses) D. output/(output-losses) Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 78. The symbol of which type of inductor has a solid line? A. An air-cored inductor B. Aferrite-coredindictor C. Alaminated-iron-coredinductor D. An epoxy-resin-cored inductor Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-47 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 79. If there is no solid or dashed line in the inductor symbol, this often means that it is a(n): A. air-cored inductor B. ferrite-coredindictor C. laminated-iron-coredinductor D. iron-powder-cored inductor Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 80. What type of inductor has a ceramic iron core? A. An air-cored inductor B. Aferrite-coredindictor C. An iron-cored inductor D. An Iron-powder-cored inductor Topic: T-point: T1 Electrical concepts, encompassing difference between alternating and direct current Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 81. Autotransformers, like other transformers, may be step-up or step-down, meaning the secondary may be: A. a higher or lower voltage than the primary voltage B. an always-lower voltage than the primary voltage C. an always-higher voltage than the primary voltage D. the same as the primary voltage Topic: T-point: T1 Electrical concepts, encompassing transformer operating principles and their application Unit of competency: UEENEEE141A Use of routine equipment/plant/technologies in an energy sector environment 141A-48 Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 82. Standard AS/NZS3000 indicates the: A. limitations placed on th