Developing Electrical Troubleshooting TPC Questions
And Answers
The actual location and routing of circuits is shown on a Right Ans - wiring
diagram
A power-installation drawing shows Right Ans - only power outlets
Changing the number of magnetic poles in the stator of a squirrel-cage motor
permits the motor to run Right Ans - two or more fixed speeds
Most reversing starters with low-voltage remote pushbuttons are all of the
following EXCEPT Right Ans - mechanically interconnected
Deterioration in a selenium rectifier is indicated by Right Ans - a gradual
rise in the input current
In autotransformer input circuits, each input line should be Right Ans -
fused
Which of the following is NOT a common cause of mechanical vibration?
Right Ans - Worn brushes
All of the following are common reasons why a split-phase motor makes a
noticeable noise when operating, EXCEPT Right Ans - too little end play
On an electrical diagram, a control relay is indicated by the designation
Right Ans - CR
The ____________ circuit of an electrical schematic is the simplest part of the
diagram and the easiest to follow. Right Ans - power
Mixing brush grades in a dc motor causes Right Ans - unequal load
distribution among brushes
A film of oil on the commutator does all of the following EXCEPT Right Ans
- prolong brush life
, Overvoltage, excessive current and too-frequent operation are possible causes
of Right Ans - burned or short-circuited magnet coils
A relay that has "dogs" located directly above the operating bar is called a
____________ relay Right Ans - latching
Which are most affected by overvoltage? Right Ans - 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 Right Ans - trip levers
on the thermal overload relays
NEMA recommends seasoning linear lamps for _____ hr before dimming
Right Ans - 12
The color temperature of the light produced by a lamp is expressed in degrees
Right Ans - Kelvin
Mechanical linkages of motor contacts, relays, and solenoids on new
equipment should Right Ans - move freely when the machine is turned on
In the identification 8TR15XTO, the X indicates Right Ans - normally closed
Thermal overload relays can generally be reset after cooling for about
Right Ans - 1 minute
One added feature of newer motor starters is a single-phase sensor that
detects Right Ans - current unbalance
A circuit that provides undervoltage release and has two wires connected to
the pilot device that energizes the magnetic control circuit is said to have
Right Ans - two-wire control
The ____________ contacts on a motor starter provide a parallel path for the
current to the coil Right Ans - auxiliary
Most methods of reducing motor speed when using multispeed controllers
involve the operator Right Ans - pressing the STOP button
And Answers
The actual location and routing of circuits is shown on a Right Ans - wiring
diagram
A power-installation drawing shows Right Ans - only power outlets
Changing the number of magnetic poles in the stator of a squirrel-cage motor
permits the motor to run Right Ans - two or more fixed speeds
Most reversing starters with low-voltage remote pushbuttons are all of the
following EXCEPT Right Ans - mechanically interconnected
Deterioration in a selenium rectifier is indicated by Right Ans - a gradual
rise in the input current
In autotransformer input circuits, each input line should be Right Ans -
fused
Which of the following is NOT a common cause of mechanical vibration?
Right Ans - Worn brushes
All of the following are common reasons why a split-phase motor makes a
noticeable noise when operating, EXCEPT Right Ans - too little end play
On an electrical diagram, a control relay is indicated by the designation
Right Ans - CR
The ____________ circuit of an electrical schematic is the simplest part of the
diagram and the easiest to follow. Right Ans - power
Mixing brush grades in a dc motor causes Right Ans - unequal load
distribution among brushes
A film of oil on the commutator does all of the following EXCEPT Right Ans
- prolong brush life
, Overvoltage, excessive current and too-frequent operation are possible causes
of Right Ans - burned or short-circuited magnet coils
A relay that has "dogs" located directly above the operating bar is called a
____________ relay Right Ans - latching
Which are most affected by overvoltage? Right Ans - 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 Right Ans - trip levers
on the thermal overload relays
NEMA recommends seasoning linear lamps for _____ hr before dimming
Right Ans - 12
The color temperature of the light produced by a lamp is expressed in degrees
Right Ans - Kelvin
Mechanical linkages of motor contacts, relays, and solenoids on new
equipment should Right Ans - move freely when the machine is turned on
In the identification 8TR15XTO, the X indicates Right Ans - normally closed
Thermal overload relays can generally be reset after cooling for about
Right Ans - 1 minute
One added feature of newer motor starters is a single-phase sensor that
detects Right Ans - current unbalance
A circuit that provides undervoltage release and has two wires connected to
the pilot device that energizes the magnetic control circuit is said to have
Right Ans - two-wire control
The ____________ contacts on a motor starter provide a parallel path for the
current to the coil Right Ans - auxiliary
Most methods of reducing motor speed when using multispeed controllers
involve the operator Right Ans - pressing the STOP button
