T6 Electrical questions with correct answers
1. The correct answer is B. A 12-volt test light is used to check for voltage. One lead
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must therefore be grounded before probing test points. - answer-1. A technician needs
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to check for voltage in a non-solid state electrical circuit. Technician A says a 12-volt
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test light can be used by attaching one lead to a known good voltage source, then
v v v v v v v v v v v v v v v v
probing various points along the circuit. Technician B says one lead of the 12-volt test
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light should be grounded, and the other used to probe various points along the circuit.
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Who is right?
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A. Technician A only
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B. Technician B only
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C. Both A and B
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D. Neither A or B
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2. The correct answer is A. An ohmmeter, like a self-powered test light, can be used to
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check for continuity through a circuit. Since both have their own power sources, the
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circuits being tested must be un-powered.
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A plain 12-volt test light or multimeter set to volts is used to check for voltage already in
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the circuit. - answer-2. Technician A says an ohmmeter can be used instead of a self-
v v v v v v v v v v v v v v v v
powered test light when checking con-tinuity. Technician B says a multimeter set to
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ohms can be used to back-probe for voltage. Who is right?
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A. Technician A only
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B. Technician B only
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C. Both A and B
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D. Neither A or B
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15. The correct answer is C, both technicians are right. Alternator noise can be caused
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by bad or dirty bearings, loose mountings, a defective diode or a shorted stator. -
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answer-15. Technician A says a noisy alternator could be caused by a bad diode.
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Technician B says a noisy alternator could be caused by a worn bearing. Who is right?
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A. Technician A only
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B. Technician B only
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C. Both A and B
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D. Neither A or B
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16. The correct answer is B. Using the equation, watts equals amps times volts, but
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solving for amps, we would multiply two times 50 watts and get 100 watts.
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Then, divide by 12 to get amps. The answer is about
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8.3. A 10-amp fuse would be needed. - answer-16. On a vehicle with a 12-volt system, a
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circuit feeds a pair of 50-watt auxiliary lights. Technician A says a
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, 5-amp fuse is OK to use in the circuit. Technician B says to find the proper amp fuse,
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you must first use a mathematical equation. Who is right?
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A. Technician A only
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B. Technician B only
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C. Both A and B
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D. Neither A or B
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17. The correct answer is B. Batteries that are deeply discharged will freeze because the
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vacid concentration decreases as the charge is used, leaving almost pure water. -
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vanswer-17. A technician finds that a truck's four batteries have all frozen solid. The
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voutside air temperature is v v v
-10 F. Technician A says the problem is the truck was parked outside at too low a
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vtemperature. Technician B says the truck's batteries were allowed to discharge too
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vdeeply. Who is right? v v v
A. Technician A only
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B. Technician B only
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C. Both A and B
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D. Neither A or B
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18. The correct answer is A. When a new battery is teamed up with several older units, it
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will tend to carry a load greater than that for which it was designed. It will be doing part
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of the work that should be done by the other units, and theretore may fail prematurely. It
v v v v v v v v v v v v v v v v v
is recommended to replace all the batteries. - answer-18. A truck has experienced a
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rapid failure of one of its four batteries. The failed battery is much newer than the other
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three. The remaining batteries are still usable, but accept a charge only very slowly.
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Technician A says all four batteries must be replaced to prevent a recurrence of the
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problem. Technician B says the one bad battery experienced a random failure, and
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should simply be replaced. Who is right?
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A. Technician A only
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B. Technician B only
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C. Both A and B
v v v v
D. Neither A or B
v v v v
19. The correct answer is B. A heavy truck alternator is typically sized to handle high
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accessory loads, and only a light charging load. Especially if there are high accessory
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loads after a jump start, the unit may very well be overloaded, causing it to overheat and
v v v v v v v v v v v v v v v v v
fail. - answer-19. The alternator on a vehicle has failed prematurely.
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Basic checks of vehicle wiring and batteries have re-
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?
vealed no problems, but the driver has left the lights on overnight several times. Each
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time, the vehicle was jump-started and sent back out. Technician A says the alternator
v v v v v v v v v v v v v v
was probably defective and replacing it should solve the problem. Technician B says the
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problem is that the vehicle's batteries should have been slow-charged before sending
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the truck back out on the road. Who is right?
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A. Technician A only
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B. Technician B only
v v v
1. The correct answer is B. A 12-volt test light is used to check for voltage. One lead
v v v v v v v v v v v v v v v v v
must therefore be grounded before probing test points. - answer-1. A technician needs
v v v v v v v v v v v v v
to check for voltage in a non-solid state electrical circuit. Technician A says a 12-volt
v v v v v v v v v v v v v v v
test light can be used by attaching one lead to a known good voltage source, then
v v v v v v v v v v v v v v v v
probing various points along the circuit. Technician B says one lead of the 12-volt test
v v v v v v v v v v v v v v v
light should be grounded, and the other used to probe various points along the circuit.
v v v v v v v v v v v v v v v
Who is right?
v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
2. The correct answer is A. An ohmmeter, like a self-powered test light, can be used to
v v v v v v v v v v v v v v v v
check for continuity through a circuit. Since both have their own power sources, the
v v v v v v v v v v v v v v
circuits being tested must be un-powered.
v v v v v v
A plain 12-volt test light or multimeter set to volts is used to check for voltage already in
v v v v v v v v v v v v v v v v v
the circuit. - answer-2. Technician A says an ohmmeter can be used instead of a self-
v v v v v v v v v v v v v v v v
powered test light when checking con-tinuity. Technician B says a multimeter set to
v v v v v v v v v v v v
ohms can be used to back-probe for voltage. Who is right?
v v v v v v v v v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
15. The correct answer is C, both technicians are right. Alternator noise can be caused
v v v v v v v v v v v v v v
by bad or dirty bearings, loose mountings, a defective diode or a shorted stator. -
v v v v v v v v v v v v v v v
answer-15. Technician A says a noisy alternator could be caused by a bad diode.
v v v v v v v v v v v v v v
Technician B says a noisy alternator could be caused by a worn bearing. Who is right?
v v v v v v v v v v v v v v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
16. The correct answer is B. Using the equation, watts equals amps times volts, but
v v v v v v v v v v v v v v
solving for amps, we would multiply two times 50 watts and get 100 watts.
v v v v v v v v v v v v v v
Then, divide by 12 to get amps. The answer is about
v v v v v v v v v v
8.3. A 10-amp fuse would be needed. - answer-16. On a vehicle with a 12-volt system, a
v v v v v v v v v v v v v v v v
circuit feeds a pair of 50-watt auxiliary lights. Technician A says a
v v v v v v v v v v v v
, 5-amp fuse is OK to use in the circuit. Technician B says to find the proper amp fuse,
v v v v v v v v v v v v v v v v v
you must first use a mathematical equation. Who is right?
v v v v v v v v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
17. The correct answer is B. Batteries that are deeply discharged will freeze because the
v v v v v v v v v v v v v v
vacid concentration decreases as the charge is used, leaving almost pure water. -
v v v v v v v v v v v v
vanswer-17. A technician finds that a truck's four batteries have all frozen solid. The
v v v v v v v v v v v v v
voutside air temperature is v v v
-10 F. Technician A says the problem is the truck was parked outside at too low a
v v v v v v v v v v v v v v v v
vtemperature. Technician B says the truck's batteries were allowed to discharge too
v v v v v v v v v v v
vdeeply. Who is right? v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
18. The correct answer is A. When a new battery is teamed up with several older units, it
v v v v v v v v v v v v v v v v v
will tend to carry a load greater than that for which it was designed. It will be doing part
v v v v v v v v v v v v v v v v v v v
of the work that should be done by the other units, and theretore may fail prematurely. It
v v v v v v v v v v v v v v v v v
is recommended to replace all the batteries. - answer-18. A truck has experienced a
v v v v v v v v v v v v v v
rapid failure of one of its four batteries. The failed battery is much newer than the other
v v v v v v v v v v v v v v v v v
three. The remaining batteries are still usable, but accept a charge only very slowly.
v v v v v v v v v v v v v v
Technician A says all four batteries must be replaced to prevent a recurrence of the
v v v v v v v v v v v v v v v
problem. Technician B says the one bad battery experienced a random failure, and
v v v v v v v v v v v v v
should simply be replaced. Who is right?
v v v v v v v
A. Technician A only
v v v
B. Technician B only
v v v
C. Both A and B
v v v v
D. Neither A or B
v v v v
19. The correct answer is B. A heavy truck alternator is typically sized to handle high
v v v v v v v v v v v v v v v
accessory loads, and only a light charging load. Especially if there are high accessory
v v v v v v v v v v v v v v
loads after a jump start, the unit may very well be overloaded, causing it to overheat and
v v v v v v v v v v v v v v v v v
fail. - answer-19. The alternator on a vehicle has failed prematurely.
v v v v v v v v v v v
Basic checks of vehicle wiring and batteries have re-
v v v v v v v v
?
vealed no problems, but the driver has left the lights on overnight several times. Each
v v v v v v v v v v v v v v
time, the vehicle was jump-started and sent back out. Technician A says the alternator
v v v v v v v v v v v v v v
was probably defective and replacing it should solve the problem. Technician B says the
v v v v v v v v v v v v v v
problem is that the vehicle's batteries should have been slow-charged before sending
v v v v v v v v v v v v
the truck back out on the road. Who is right?
v v v v v v v v v v
A. Technician A only
v v v
B. Technician B only
v v v
