DC MOTOR - Practice Mode

1) Which type of instrument is used to test the armature winding?

Megger Growler Multimeter Ohmmeter

Correct Answer: Growler

2) Why the holding coil of a 3 point starter is connected in series with shunt field?

To limit the load current To run motor at low voltage To hold the handle plunger firmly To protect the motor from high speed

Correct Answer: To protect the motor from high speed

3) What is the best method to change the DOR of a compound motor without change of its characteristics?

Change armature current direction Change shunt field current direction Change series field current direction Change the current in armature and shunt field together

Correct Answer: Change armature current direction

4) What is the purpose of NVC connected in series with the field in 3 point starter?

To improve the torque Reduce the field current To decrease the back emf To prevent increase in speed

Correct Answer: To prevent increase in speed

5) Which type of DC motor is used for sudden application of heavy loads?

Shunt motor Series motor Differential compound motor Cumulative compound motor

Correct Answer: Cumulative compound motor

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