Developing Electrical Troubleshooting TPC
UPDATED Exam Questions and CORRECT
Answers
The actual location and routing of circuits is shown on a - CORRECT ANSWER - wiring
diagram
A power-installation drawing shows - CORRECT ANSWER - only power outlets
Changing the number of magnetic poles in the stator of a squirrel-cage motor permits the motor
to run - CORRECT ANSWER - two or more fixed speeds
Most reversing starters with low-voltage remote pushbuttons are all of the following EXCEPT -
CORRECT ANSWER - mechanically interconnected
Deterioration in a selenium rectifier is indicated by - CORRECT ANSWER - a gradual rise
in the input current
In autotransformer input circuits, each input line should be - CORRECT ANSWER - fused
Which of the following is NOT a common cause of mechanical vibration? - CORRECT
ANSWER - Worn brushes
All of the following are common reasons why a split-phase motor makes a noticeable noise when
operating, EXCEPT - CORRECT ANSWER - too little end play
On an electrical diagram, a control relay is indicated by the designation - CORRECT
ANSWER - CR
, The ____________ circuit of an electrical schematic is the simplest part of the diagram and the
easiest to follow. - CORRECT ANSWER - power
Mixing brush grades in a dc motor causes - CORRECT ANSWER - unequal load
distribution among brushes
A film of oil on the commutator does all of the following EXCEPT - CORRECT
ANSWER - prolong brush life
Overvoltage, excessive current and too-frequent operation are possible causes of - CORRECT
ANSWER - burned or short-circuited magnet coils
A relay that has "dogs" located directly above the operating bar is called a ____________ relay -
CORRECT ANSWER - latching
Which are most affected by overvoltage? - CORRECT ANSWER - Slow-speed motors(not
sure)
If a motor stops for no apparent reason and you are called to inspect the motor starter, the first
thing you should check is the - CORRECT ANSWER - trip levers on the thermal overload
relays
NEMA recommends seasoning linear lamps for _____ hr before dimming - CORRECT
ANSWER - 12
The color temperature of the light produced by a lamp is expressed in degrees - CORRECT
ANSWER - Kelvin
Mechanical linkages of motor contacts, relays, and solenoids on new equipment should -
CORRECT ANSWER - move freely when the machine is turned on
UPDATED Exam Questions and CORRECT
Answers
The actual location and routing of circuits is shown on a - CORRECT ANSWER - wiring
diagram
A power-installation drawing shows - CORRECT ANSWER - only power outlets
Changing the number of magnetic poles in the stator of a squirrel-cage motor permits the motor
to run - CORRECT ANSWER - two or more fixed speeds
Most reversing starters with low-voltage remote pushbuttons are all of the following EXCEPT -
CORRECT ANSWER - mechanically interconnected
Deterioration in a selenium rectifier is indicated by - CORRECT ANSWER - a gradual rise
in the input current
In autotransformer input circuits, each input line should be - CORRECT ANSWER - fused
Which of the following is NOT a common cause of mechanical vibration? - CORRECT
ANSWER - Worn brushes
All of the following are common reasons why a split-phase motor makes a noticeable noise when
operating, EXCEPT - CORRECT ANSWER - too little end play
On an electrical diagram, a control relay is indicated by the designation - CORRECT
ANSWER - CR
, The ____________ circuit of an electrical schematic is the simplest part of the diagram and the
easiest to follow. - CORRECT ANSWER - power
Mixing brush grades in a dc motor causes - CORRECT ANSWER - unequal load
distribution among brushes
A film of oil on the commutator does all of the following EXCEPT - CORRECT
ANSWER - prolong brush life
Overvoltage, excessive current and too-frequent operation are possible causes of - CORRECT
ANSWER - burned or short-circuited magnet coils
A relay that has "dogs" located directly above the operating bar is called a ____________ relay -
CORRECT ANSWER - latching
Which are most affected by overvoltage? - CORRECT ANSWER - Slow-speed motors(not
sure)
If a motor stops for no apparent reason and you are called to inspect the motor starter, the first
thing you should check is the - CORRECT ANSWER - trip levers on the thermal overload
relays
NEMA recommends seasoning linear lamps for _____ hr before dimming - CORRECT
ANSWER - 12
The color temperature of the light produced by a lamp is expressed in degrees - CORRECT
ANSWER - Kelvin
Mechanical linkages of motor contacts, relays, and solenoids on new equipment should -
CORRECT ANSWER - move freely when the machine is turned on
