DC Shunt Motor - Electronic Engineering
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MCQ DC motor’s most suitable motor for electric traction is a series motor DC compound motor DC shunt motor in DC motor back EMF depending on speed.
- trains
- cranes
- machine tools
- hoists
Question 1: DC shunt motors are used for driving?
Answers: machine tools
- back EMF of rotor is more than the applied voltage
- back EMF is less than the applied voltage
- back EMF is equal to the applied voltage
- none of the above
Question 2: Regenerative method of braking is based on that?
Answers: back EMF of rotor is more than the applied voltage
- Series motor
- Either of the above
- None of the above
- Shunt motor
Question 3: Which motor should be used for centrifugal pumps?
Answers: Shunt motor
- Series motor
- Air motor
- Shunt motor
- Battery operated motor
Question 4: Which of the following motor is preferred for operation in highly explosive atmosphere?
Answers: Air motor
- many number of turns of thick wire
- few number of turns of thin wire
- few number of turns of thick wire
- many number of turns of thin wire
Question 5: DC series machine bas field consisting of?
Answers: few number of turns of thick wire
- constant voltage drive
- constant current drive
- none of the above
- constant torque drive
Question 6: The armature voltage control of DC motor provides?
Answers: constant torque drive
- Increasing the resistance in armature circuit
- Increasing the resistance in field circuit
- Reducing the resistance in the armature circuit
- Reducing the Resistance in the field circuit
Question 7: The speed of a DC shunt motor can be increased by?
Answers: Increasing the resistance in field circuit
- torque developed by the motor would be reduced to zero
- it would race to almost infinite speed
- the fuse or circuit breaker will open the circuit before too much damage is done to the motor
- it would draw abnormally high armature current
Question 8: If the field circuit of a loaded shunt motor is suddenly opened?
Answers: the fuse or circuit breaker will open the circuit before too much damage is done to the motor
- stray losses
- eddy current losses
- field copper losses
- windage losses
Question 9: The purpose of retardation test on D.C. shunt machines is to find out?
Answers: stray losses
- 215V
- 210V
- 220V
- 224V
Question 10: A 230V DC shunt motor takes 32 A at full load. The back e.m.f. on full load, if the resistance of motor armature and shunt field windings are 0.2 ? and 115 ? respectively, will be?
Answers: 224V
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