- Study guides, Class notes & Summaries
Looking for the best study guides, study notes and summaries about ? On this page you'll find 78 study documents about .
Exam (elaborations)
George Brown College - Electromechanical Technician Class - Module 1 With Questions And 100% SURE ANSWERS
George Brown College - Electromechanical Technician Class - Module 1 With Questions And 100% SURE ANSWERS
Queenstin
Exam (elaborations)
Electronics Technician With 100% Accurate Questions And Answers Graded A+
Electronics Technician With 100% Accurate Questions And Answers Graded A+
Queenstin
Exam (elaborations)
VDV PRACTICE TEST 1 Quizzes With Correct Solutions Graded A+ Pass 100%
A ________ is used to measure optical power. - CORRECT ANSWER -power meter A force that pushes electrons through a circuit is called ____________. - CORRECT ANSWER -voltage A series of _________ is the simplest form of output from an automation system. - CORRECT ANSWER -relay contacts A technician must install a 24 volt power supply for a CCTV camera. What type of power supply must he install? - CORRECT ANSWER -he should forget about overcurrent protection and install a Class 2 po...
Eddiestudy
Exam (elaborations)
ECE 320: Electronic 1 Question & Answer
ECE 320: Electronic 1 Question & Answer A diode connected across a relay coil is used to. Option A. dissipate coil spikes on switch off. Option B. allow the coil to energize with only one polarity. Option C. cause a delay in switching on. - ANSWER: dissipate coil spikes on switch off. A diode is parallel to an LED in an AC circuit to. Option A. provide correct amount of current for LED when circuit is switched on. Option B. prevent back EMF in the circuit when LED is switched off. Option...
EddieBestStudy
Exam (elaborations)
Electronic Devices and Circuits - Section 5 Question & Answers
Electronic Devices and Circuits - Section 5 Question & Answers A JFET operates in ohmic region when A. VGS = 0 B. VGS is less than pinch off voltage C. VGS = is Positive D. VGS = VDS - ANSWER: B A P-N junction offers A. high resistance in forward as well as reverse direction B. low resistance in forward as well as reverse direction C. conducts in forward direction only D. conducts in reverse direction only - ANSWER: C A varactor diode is A. reverse biased B. forward biased C. biase...
EddieBestStudy
Exam (elaborations)
Electronic Devices and Circuits - Section 4 Question & Answers
Electronic Devices and Circuits - Section 4 Question & Answers A reverse voltage of 18 V is applied to a semiconductor diode. The voltage across the depletion layer is A. 0 V B. 0.7 V C. about 10 V D. 18 V - ANSWER: D Almost whole of reverse voltage is across depletion layer. A Si sample is doped with a fixed number of group N impurities. The electron density n is measured from 4 K to 1200 k for the sample. Which one of the following is correct? A. n remains constant over the temperatu...
EddieBestStudy
Exam (elaborations)
Electronic Devices and Circuits - Section 3 Question & Answers
Electronic Devices and Circuits - Section 3 Question & Answers An intrinsic silicon sample has 2 million free electrons. The number of holes in the sample is A. 2 million B. almost zero C. more than 2 million D. less than 2 million - ANSWER: A . Light dependent resistor is A. photo resistive device B. photo voltaic device C. photo emissive device D. either (a) or (c) - ANSWER: A A semiconductor diode is biased in forward direction and carrying current I. The current due to holes in ...
EddieBestStudy
Exam (elaborations)
Electronic Devices and Circuits - Section 2 Question & Answers
Electronic Devices and Circuits - Section 2 Question & Answers A Schottky diode clamp is used along with switching BJT for A. reducing the power dissipation B. reducing the switching time C. increasing the value of β D. reducing the base current - ANSWER: B An incremental model of a solid state device is one which represents the A. ac property of the device at desired operating point B. dc property of the device at all operating points C. complete ac and dc behaviour at all operating p...
EddieBestStudy
Exam (elaborations)
Electronic Devices and Circuits - Section 1 Question & Answers
Electronic Devices and Circuits - Section 1 Question & Answers A p-n junction diode has A. low forward and high reverse resistance B. a non-linear v-i characteristics C. zero forward current till the forward voltage reaches cut in value D. all of the above - ANSWER: D A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is A. 31 V B. 32 V C. insuff...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 1 Question & Answer
Power Electronics - Section 1 Question & Answer Thyristors are suitable for dc circuit breakers but not for ac circuit breakers. A. True B. False - ANSWER: B A chopper A. converts constant voltage dc into ac and then into variable voltage dc B. converts constant voltage dc into variable voltage dc directly C. converts ac of one frequency into ac of another frequency D. converts ac to dc - ANSWER: B A cycloconverter can be A. step down B. step up C. step down or step up D. none of th...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 2 Question & Answers
Power Electronics - Section 2 Question & Answers A 3 phase ac regulator uses A. 3 thyristors B. 6 thyristors C. 9 thyristors D. 12 thyristors - ANSWER: B Two thyristors for each phase. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is A. 40 A B. 20 A C. 10 A D. 5 A - ANSWER: B Two resistances are in series at any time. A dc circuit breaker must use A. natural commutation B. forc...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 3 Question & Answers
Power Electronics - Section 3 Question & Answers A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be A. about 1350 rpm B. about 720 rpm C. about 360 rpm D. either (b) or (c) - ANSWER: B In this case synchronous speed at 50 Hz is 1500 rpm. Therefore synchronous speed at 25 Hz is 750 rpm. Since slip is about 3 - 5%, speed is about 720 rpm. A 3 phase induction moto...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 4 Question & Answers
Power Electronics - Section 4 Question & Answers In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is A. 0 ≤ a ≤ p B. θ ≤ a ≤ p C. 0 ≤ a ≤ (p - θ) D. θ ≤ a ≤ (p + θ) - ANSWER: B A chopper cannot be line commutated. A. True B. False - ANSWER: A A current source inverter has simple commutation circuit. A. True B. False - ANSWER: A A full bridge inverter is fed by a battery of 30 V...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 5 Question & Answers
Power Electronics - Section 5 Question & Answers A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of thyristor current is A. 400/10 B. 400/15 C. 400/20 D. 400/30 - ANSWER: B A 3 phase dual converter consists of A. two 3 phase semiconverters connected in parallel B. two 3 phase semiconverters connected in antiparallel C. two 3 phase full converters connected in antiparallel D. two 3 phase full converte...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 6 Question & Answers
Power Electronics - Section 6 Question & Answers A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque A. will be less than 100 N-m B. will be more than 100 N-m C. may be more or less than 100 N-m depending on motor parameters D. very small - ANSWER: B A cycloconverter for single phase operation has A. one positive group and one negative group converters B. two...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 7 Question & Answers
Power Electronics - Section 7 Question & Answers A 3 phase fully controlled converter is a A. 3 pulse converter B. 6 pulse converter C. 2 pulse converter D. 12 pulse converter - ANSWER: B A cycloconverter is a group of controlled rectifiers. A. True B. False - ANSWER: A A cycloconverter uses A. natural commutation B. forced commutation C. either natural or forced commutation D. both natural and forced commutation together - ANSWER: C A fully controlled bridge converter can operate ...
EddieBestStudy
Exam (elaborations)
Power Electronics - Section 8 Question & Answers
Power Electronics - Section 8 Question & Answers A crowbar circuit is generally needed for protection under fault conditions. A. True B. False - ANSWER: A A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to A. decrease the firing angle B. increase the firing angle C. either decrease or increase th...
EddieBestStudy
Exam (elaborations)
Test Bank for Electrical Wiring Commercial, 18th Edition Simmons (All Chapters included)
Complete Test Bank for Electrical Wiring Commercial, 18th Edition by Phil Simmons, Ray C. Mullin, Mark C. Ode ; ISBN13: 9780357767108...(Full Chapters included Chapter 1 to 22)...1. Commercial Building Plans and Specifications. 2. Reading Electrical Working Drawings--Entry Level. 3. General Requirements for Conductors. 4. Branch Circuits. 5. Switches and Receptacles. 6. Wiring Methods. 7. Motor and Appliance Circuits. 8. Feeder Installation and Load Calculation. 9. Special Systems. 10. ...
mizhouubcca
Exam (elaborations)
Solutions for Electrical Wiring Commercial, 18th Edition Simmons (All Chapters included)
Complete Solutions Manual for Electrical Wiring Commercial, 18th Edition by Phil Simmons, Ray C. Mullin, Mark C. Ode ; ISBN13: 9780357767108.....(Full Chapters included Chapter 1 to 22)...1. Commercial Building Plans and Specifications. 2. Reading Electrical Working Drawings--Entry Level. 3. General Requirements for Conductors. 4. Branch Circuits. 5. Switches and Receptacles. 6. Wiring Methods. 7. Motor and Appliance Circuits. 8. Feeder Installation and Load Calculation. 9. Special Syste...
mizhouubcca
Exam (elaborations)
Solutions for Engineering Circuit Analysis, 10th Edition Hayt (All Chapters included)
Complete Solutions Manual for Engineering Circuit Analysis, 10th Edition by William H. Hayt, Steven M. Durbin, Jamie Phillips ; ISBN13: 9781264149919.....(Full Chapters included Chapter 1 to 18)...Chapter 1: Introduction Chapter 2: Basic Components and Electric Circuits Chapter 3: Voltage and Current Laws Chapter 4: Basic Nodal and Mesh Analysis Chapter 5: Handy Circuit Analysis Techniques Chapter 6: The Operational Amplifier Chapter 7: Capacitors and Inductors Chapter 8: Basic RC and RL ...
mizhouubcca