Single Phase Motors TPC UPDATED
ACTUAL Questions and CORRECT
Answers
A servomechanism has the abbreviations CX and CT on it. What do these mean? - CORRECT
ANSWER Control transmitter, control transformer
A servomotor operates when the - CORRECT ANSWER control field is energized
Many electric motors are manufactured according to standards set by - CORRECT
ANSWER NEMA
On a motor nameplate, the NEMA designation "A" indicates a - CORRECT
ANSWER normal starting current
Two capacitors connected in series have a combined voltage rating equal to the _________ of
their individual ratings. - CORRECT ANSWER sum
In order for a dual-voltage motor to run on 120 V instead of 240 V, its running windings must be
connected in - CORRECT ANSWER parallel
A manual single-phase motor starter has - CORRECT ANSWER one or two poles
The purpose of the long time-lag thermal cutout on a dual-element fuse is to - CORRECT
ANSWER prevent unnecessary shutdowns
To determine whether a winding in a split-phase motor is grounded, you should use a(n) -
CORRECT ANSWER megohmmeter
, You can reverse the direction of rotation in a split-phase motor by reversing the connections to -
CORRECT ANSWER either winding but not both
Hysteresis motors will run on frequencies ranging from _________ to _________ Hz. -
CORRECT ANSWER 25; 2000
You can mechanically reverse a shaded-pole motor by removing the end plates of the motor and
____________ the stator poles. - CORRECT ANSWER physically reversing
A capacitor rated at 200 microfarads is still usable if its measured capacitance is at least
_________ microfarads. - CORRECT ANSWER 160
A large amount of movement in any direction by a motor's shaft is a sign of a - CORRECT
ANSWER worn bearing
A distinguishing characteristic of a universal motor is its - CORRECT ANSWER high
power output per pound of weight
The best way to maintain torque in a universal motor running at low speed is to use a(n) -
CORRECT ANSWER electronic controller with an SCR
In synchro transmitters and receivers, stator coils - CORRECT ANSWER serve as the
secondary windings
The part of a synchro control system that supplies an ac signal from its rotor is the - CORRECT
ANSWER control transformer
An open winding in a split-phase motor is indicated by an ohmmeter reading of - CORRECT
ANSWER infinity
ACTUAL Questions and CORRECT
Answers
A servomechanism has the abbreviations CX and CT on it. What do these mean? - CORRECT
ANSWER Control transmitter, control transformer
A servomotor operates when the - CORRECT ANSWER control field is energized
Many electric motors are manufactured according to standards set by - CORRECT
ANSWER NEMA
On a motor nameplate, the NEMA designation "A" indicates a - CORRECT
ANSWER normal starting current
Two capacitors connected in series have a combined voltage rating equal to the _________ of
their individual ratings. - CORRECT ANSWER sum
In order for a dual-voltage motor to run on 120 V instead of 240 V, its running windings must be
connected in - CORRECT ANSWER parallel
A manual single-phase motor starter has - CORRECT ANSWER one or two poles
The purpose of the long time-lag thermal cutout on a dual-element fuse is to - CORRECT
ANSWER prevent unnecessary shutdowns
To determine whether a winding in a split-phase motor is grounded, you should use a(n) -
CORRECT ANSWER megohmmeter
, You can reverse the direction of rotation in a split-phase motor by reversing the connections to -
CORRECT ANSWER either winding but not both
Hysteresis motors will run on frequencies ranging from _________ to _________ Hz. -
CORRECT ANSWER 25; 2000
You can mechanically reverse a shaded-pole motor by removing the end plates of the motor and
____________ the stator poles. - CORRECT ANSWER physically reversing
A capacitor rated at 200 microfarads is still usable if its measured capacitance is at least
_________ microfarads. - CORRECT ANSWER 160
A large amount of movement in any direction by a motor's shaft is a sign of a - CORRECT
ANSWER worn bearing
A distinguishing characteristic of a universal motor is its - CORRECT ANSWER high
power output per pound of weight
The best way to maintain torque in a universal motor running at low speed is to use a(n) -
CORRECT ANSWER electronic controller with an SCR
In synchro transmitters and receivers, stator coils - CORRECT ANSWER serve as the
secondary windings
The part of a synchro control system that supplies an ac signal from its rotor is the - CORRECT
ANSWER control transformer
An open winding in a split-phase motor is indicated by an ohmmeter reading of - CORRECT
ANSWER infinity
