Associate CET 6th Guide Questions With Correct Answers

A resistor __________________. a. stores an electric charge b. is measured in coulombs c. cause a voltage drop across it d. dependent on lines of force - Answer c. cause a voltage drop across it 1 kΩ is the same as _________. a. 1000 ohms b. .001 ohms c. 10e-2 ohms d. 10000 ohms - Answer a. 1000 ohms A resistor with color bands orange, red, brown is _____. a. 3.2 mega ohms b. 232 ohms c. 2.3 kilo ohms d. 320 ohms - Answer d. 320 ohms A circuit with 500 ohm resistor in series with three 500 ohms connected in parallel with each other. The total resistance would be a. 666 ohms b 167.7 ohms c. 750 ohms d. 1000 ohms - Answer a. 666 ohms The voltage rating of a capacitor... a. must be factored into reactance formula b. relates to max voltage that should be applied to it c. indicates max current allowed d. is same as power factor - Answer b. relates to max voltage that should be applied to it Calculating the total capacitance of several capacitors in parallel _____. a. is not necessary as they are used b. causes a need to consider inductance factors c. is done by adding each of the capacitance values d. adding by the reciprocal of capacitance values - Answer c. is done by adding each of the capacitance values Ferrite _____. a. is a dielectric b. is a common inductor core material c. is most common resistor coating d. causes faulty saturation of inductors - Answer b. is a common inductor core material The term Henry refers to _____. a. the inductive property of a coil b. the inventor of inductors c. reactance of LR circuits d. resonant frequency of tank circuits - Answer a. the inductive property of a coil A certain transformer has 250 turns in the primary windings and 1250 turns in the secondary winding. The turns ratio is __________. a. 0.2 b. 2.5 c. 5 d. 0.5 - Answer a. 0.2 When the turns ration of a transformer is 10 and the primary AC voltage is 8V, the secondary voltage is _____. a. 80 volts b. 0.8 volts c. 8 volts d. 64 volts - Answer b. 0.8 volts Which of these color code patterns is found of a 270Ω 5% resistor? a. red, violet, brown, silver b. red, violet, brown, gold c. red, brown, black, silver d. red, violet, black , silver - Answer b. red, violet, brown, gold One microfarad is equivalent to __________ picofarads. A. 10 B. 1000 C. 100,000 D. 1,000,000 - Answer D. 1,000,000 The capacitance of a capacitor with 10uC of electric charge and 100V across its plates is ____. a. 0.1uF b. 10uF c. 1000uF d. 107uF - Answer a. 0.1uF The atomic number of an element is the same as the element's atomic weight a. True b. False - Answer b. False An increase in voltage with resistance held constant cause current to _____. a. decrease b. increase twice to value of voltage c. increase d. none of the above - Answer c. increase The ampere, expresses __________. A. Volts/sec increase B. A unit of charge movement per second past a given point C. Coulombs/charge D. An increase in resistance - Answer B. A unit of charge movement per second past a given point The total resistance of a parallel circuit with equal branch resistance is found by _____. a. adding all branch resistance values b. by taking product of all branch resistance values c. by dividing resistance value of a branch by the number of branches d. value cannot be found - Answer c. by dividing resistance value of a branch by the number of branches A 12 vdc power supply has a 15 ohm internal resistance. What load resistance can be connected to transfer max power? a. 15 ohms b. 20 ohms c. 6 ohms d. 10 ohms - Answer a. 15 ohms Maximum power transfer occurs when the load impedance is equal to source impedance. a. True b. False - Answer a. True What will happen to the current through a resistor if resistor value increases? a. current increases b. current stays same c. current decreases d. current and voltage increase across the resistor - Answer c. current decreases What type of circuit has the same voltage drop across each component? a. parallel b. series-parallel c. series d. combination - Answer a. parallel Total power in a series circuit is determined by the: a. Source voltage times the current b. Total voltage applied to the circuit c. Current flowing through the switch d. Average wattage rating of each resistor - Answer A. Source voltage times the current What is the equivalent to 100 microamps? a. .1 milliamps b. 1 milliamps c. 10 milliamps d. 10 nanoamps - Answer a. .1 milliamps B+, or supply voltages in electronics products, is considered to be: a. +5 to +12 VDC b. 0 to 30 V DC c. +12 to 300 V DC d. The anode or plate voltage supply - Answer C. +12 to 300 V DC Leakage current in an electronic product, between either of the AC power cord conductors and chassis or any exposed metal parts should not exceed _____. a. 5 microamps b. 500 microamps c. 5 milliamps d. 50 milliamps - Answer b. 500 microamps Shaded components on the electronics schematics mean: a. Only factory service personnel may change the part b. Only exact replacement parts may be used c. The shading makes for better readability d. High voltage is present on these parts - Answer B. Only exact replacement parts may be used Ingested solder fumes when particles _______. a. I'm not harmful to the human body b. Are toxic c. From lead-tin solder aren't harmful d. From tin-alloys are most harmful - Answer b. Are toxic Second degree skin burns should ____. a. not be treated with ice and bandage pack b. be covered with thick bandages c. be treated with cold water or ice d. be treated by draining blister - Answer a. not be treated with ice and bandage pack Rules describing the fire or toxicity retardant types of cabling which may be installed in buildings is contained in _________. a. NEC Article 770 b. UL 569B c. TIA/EIA standard 578 d. NEMA code 1316 - Answer a. NEC Article 770 ESD and static discharge is most destructive to _______. a. CMOS semiconductors b. TTL semiconductors c. Germanium PN junctions d. Silicon PN junctions - Answer a. CMOS semiconductors If you have never received formal training and practiced CPR on a person or dummy, in the event of finding a fellow worker not breathing, you ____. a. use what knowledge you have and attempt it b. should not attempt, but call for help c. should attempt after calling for help d. read the instructions and attempt - Answer b. should not attempt, but call for help When working at heights above 6 feet, a ____ is required by OSHA rules. a. linemen's belt b. linemen's belt attached to a lanyard c. full body harness attached to a lanyard which prevents more than 6' drop d. good insurance policy - Answer c. full body harness attached to a lanyard which prevents more than 6' drop Residual voltage is associated with ____. a. Northern Lights b. corona arcing from electrical generators c. charge retained by inductors d. charge retained by capacitors - Answer d. charge retained by capacitors Total impedance in a series circuit is found by: a. adding up all series resistance and reactance values b. subtracting all inductive reactances from all capactive reactances and adding resistor values c. finding net reactance and the net resistance, square each separately, add together and then find square mroot of the sum d. divide the applied voltage by the addition of all circuit components individual currents - Answer c. finding net reactance and the net resistance, square each separately, add together and then find square mroot of the sum In a series AC circuit with a resistor, inductor and capacitor, each with the same resistance of reactance, a voltmeter measuring each individual voltage drop would find: a. The voltage equal to each other b. The reactance voltage of the capacitor or the inductor would be greater than the resistance voltage measurement c. The resistance voltage would be higher than the voltage across the inductor or the capacitor d. The supply voltage would be measured across the resistor and the voltage across the capacitor and across the inductor would measure 0V - Answer a. The voltage equal to each other Which of the following is not a characteristic of a series circuit? a. circuit components have a division of the supply voltage b. all components share one current c. energy is shared by reactive devices d. there is a different level of current in the reactive components than in the resistive components - Answer d. there is a different level of current in the reactive components than in the resistive components In an AC circuit, as the applied voltage frequency changes upward, the inductive reactance in the circuit will: a. Decrease b. Increase c. Stay the same d. Either increase or decrease - Answer b. Increase In an AC circuit, as the applied voltage frequency increases, the capacitive reactance in the circuit will: a. decrease b. increase c. stay the same d. either increase or decrease - Answer a. decrease A 50KHz AC voltage is applied to a 10mH inductor, its reactance at this frequency is: a. 3140 ohms b. 300 ohms c. 3100 ohms d. 500 ohms - Answer a. 3140 ohms A .1uF capacitor in a circuit with a frequency of 100 KHz applied has a reactance of: a. 1.59 ohms b. 15.9 ohms c. 159 ohms d. 15.9 kohms - Answer b. 15.9 ohms In a series circuit when the inductive reactances equal the capacitor reactances the circuit has ____ impedance. a. maximum b. double the inductors c. minimum d. no - Answer c. minimum In a parallel circuit when the inductive reactances equal the capacitor reactances the circuit has ____ impedance. a. maximum b. double the capacitor's c. minimum d. no - Answer a. maximum Resonance is when __________. a. All resistances in an AC circuit are equal to each other b. All reactances are equal on each reactive component c. The total of the inductive reactances in the circuit equal the total of all capacitive reactances d. No current is flowing through an AC circuit when a voltage is applied - Answer c. The total of the inductive reactances in the circuit equal the total of all capacitive reactances ____ cells are prone to battery memory. a. zinc b. NiCad c. Alkaline d. Lithium - Answer b. NiCad A conducting loop in motion through magnetic lines of flux has a current induced in it. The physical law that explains this is what? a. Lenz's Law b. Law of inertia c. Compton shift d. Kirchoff's current law - Answer a. Lenz's Law An AC generator is also known as a a. regulator b. alternator c. phasor d. slip ring - Answer b. alternator Three-phase power is obtained from an AC generator by wiring the armature winding in a ___ or ___ configurations. a. alpha, beta b. treble, bass c. polymorph, triad d. delta, wye - Answer d. delta, wye What element of a DC generator distinguishes it from a AC generator? a. Slip rings b. Commutator c. Series wound field coil d. Armature - Answer b. Commutator What type of motor will speed dangerously out of control if not physically loaded? a. induction motor b. shunt wound DC motor c. series wound DC motor d. series wound AC motor - Answer c. series wound DC motor AC motor speed depends on __________. a. The frequency of the voltage applied to it b. The voltage level applied c. The phase of the voltage applied to it d. The power left in the dilithium - Answer a. The frequency of the voltage applied to it Series wound AC motors have strong torque from a dead stop. This makes then ideally suited for use in small appliances. a. True b. False - Answer a. True What element of a synchronous AC motor provides startup torque for the motor? a. Slip rings b. Salient poles c. Squirrel cage d. Armature - Answer c. Squirrel cage An AC induction motor requires what to operate? a. input power b. slip rings c. slip d. rotor battery - Answer c. slip What happens to the value of a capacitor if the spacing between plates decreases? a, increase b. Stay same c. decreases d. varies - Answer a, increase A variable capacitor's plates can open or close. As the plates open, capacitance: a. stay same b. capacitors aren't made way c. decreases d. increases - Answer c. decreases an inductor with the same length of wire but whose turns are spaced further apart will have: a. less inductance b. more inductance c. equal inductance d. more mutual inductance - Answer a. less inductance An inductor in an electrical circuit: a. Causes current to lead voltage b. Opposes the flow of AC current c. Appears capacitive to AC current d. Appears as a short circuit to AC current - Answer b. Opposes the flow of AC current The term for the combination of resistance and reactance that restricts the flow of alternating current is: a. Volt-amperes b. Impedance c. Susceptance d. Power factor - Answer b. Impedance Is the value of a 500 picofarad capacitor and a .5 nanofarad capacitor identical? A. Yes B. No - Answer A. Yes In a generator, a DC voltage applied to the field windings controls the output level. A. True B. False - Answer A. True Which of these is within tolerance for a resistor color coded red, black, red, gold. a. 1850 ohms b. 2150 ohms c. 1950 ohms d. 2250 ohms - Answer c. 1950 ohms Which one of the below will cause a generator to produce DC voltage rather than AC voltage? a. brushes b. armature c. commutator d. field windings - Answer c. commutator Total capacitance of capacitors connected in parallel is like: