DEVELOPING ELECTRICAL TROUBLESHOOTING TPC COMPLETE
SET OF CURRENT EXAM QUESTIONS AND CORRECT ANSWERS
An ANSWER wiring diagram displays the circuits' actual locations and routing.
An illustration of the electricity installation displays only ANSWER power
outlets.
A squirrel-cage motor can operate at two or more fixed speeds by adjusting the
number of magnetic poles in the stator.
The majority of low-voltage remote pushbuttons for reversing starters are all of
the following: Aside from that, the answer is mechanically connected.
A slow increase in the input current is a sign of selenium rectifier deterioration.
Every input line in autotransformer input circuits needs to be ANSWER fused.
Which of these DOES NOT frequently result in mechanical vibration?
ANSWER Used brushes
A split-phase motor may produce a detectable noise while working for any of
the following reasons, except ANSWER: insufficient end play.
The designation ANSWER CR in an electrical diagram denotes a control relay.
An electrical schematic's ____________ circuit is its most basic and
straightforward section. ANSWER power
When brush grades are mixed in a DC motor, the result is an uneven
distribution of load among the brushes.
The commutator's oil film performs all of the following functions. EXCEPT:
ANSWER extends the brush life
ANSWER burnt or short-circuited magnet coils may be caused by overvoltage,
high current, or too frequent operation.
, A ____________ relay with "dogs" situated just above the operating bar is
known as an ANSWER latching relay.
Which is overvoltage most likely to affect? ANSWER: Motors at a slow speed
(unsure)
The ANSWER trip levers on the thermal overload relays should be checked first
if a motor stops for no obvious reason and you are requested to inspect the
motor starter.
Before dimming, NEMA advises seasoning linear lights for ___ hours.
ANSWER 12
Degrees are used to represent the color temperature of a lamp's light. ANSWER
Kelvin
When the new equipment is turned on, the mechanical connections of the motor
contacts, relays, and solenoids should ANSWER move easily.
The symbol X in the identification 8TR15XTO stands for "ANSWER normally
closed."
In most cases, thermal overload relays can be reset after cooling for around -
ANSWER 1 minute.
Modern motor starters now have a single-phase sensor that can identify
ANSWER current imbalance.
ANSWER two-wire control is a circuit that has two wires attached to the pilot
device that powers the magnetic control circuit and offers undervoltage release.
A motor starter's ____________ contacts give the current a parallel path to the
coil—ANSWER auxiliary
When employing multispeed controllers, the operator, ANSWER, typically
presses the STOP button to lower the motor speed.
A high slip can result by running a strongly loaded motor at __________, which
lowers the voltage.
Limit switches offer ANSWER overtravel safety when added to a reversing
motor's control circuit.
SET OF CURRENT EXAM QUESTIONS AND CORRECT ANSWERS
An ANSWER wiring diagram displays the circuits' actual locations and routing.
An illustration of the electricity installation displays only ANSWER power
outlets.
A squirrel-cage motor can operate at two or more fixed speeds by adjusting the
number of magnetic poles in the stator.
The majority of low-voltage remote pushbuttons for reversing starters are all of
the following: Aside from that, the answer is mechanically connected.
A slow increase in the input current is a sign of selenium rectifier deterioration.
Every input line in autotransformer input circuits needs to be ANSWER fused.
Which of these DOES NOT frequently result in mechanical vibration?
ANSWER Used brushes
A split-phase motor may produce a detectable noise while working for any of
the following reasons, except ANSWER: insufficient end play.
The designation ANSWER CR in an electrical diagram denotes a control relay.
An electrical schematic's ____________ circuit is its most basic and
straightforward section. ANSWER power
When brush grades are mixed in a DC motor, the result is an uneven
distribution of load among the brushes.
The commutator's oil film performs all of the following functions. EXCEPT:
ANSWER extends the brush life
ANSWER burnt or short-circuited magnet coils may be caused by overvoltage,
high current, or too frequent operation.
, A ____________ relay with "dogs" situated just above the operating bar is
known as an ANSWER latching relay.
Which is overvoltage most likely to affect? ANSWER: Motors at a slow speed
(unsure)
The ANSWER trip levers on the thermal overload relays should be checked first
if a motor stops for no obvious reason and you are requested to inspect the
motor starter.
Before dimming, NEMA advises seasoning linear lights for ___ hours.
ANSWER 12
Degrees are used to represent the color temperature of a lamp's light. ANSWER
Kelvin
When the new equipment is turned on, the mechanical connections of the motor
contacts, relays, and solenoids should ANSWER move easily.
The symbol X in the identification 8TR15XTO stands for "ANSWER normally
closed."
In most cases, thermal overload relays can be reset after cooling for around -
ANSWER 1 minute.
Modern motor starters now have a single-phase sensor that can identify
ANSWER current imbalance.
ANSWER two-wire control is a circuit that has two wires attached to the pilot
device that powers the magnetic control circuit and offers undervoltage release.
A motor starter's ____________ contacts give the current a parallel path to the
coil—ANSWER auxiliary
When employing multispeed controllers, the operator, ANSWER, typically
presses the STOP button to lower the motor speed.
A high slip can result by running a strongly loaded motor at __________, which
lowers the voltage.
Limit switches offer ANSWER overtravel safety when added to a reversing
motor's control circuit.
