Synchronous Motor Quiz | Synchronous Motor Short Questions and Answers

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Questions
41 In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
A One-third
B Twice
C Thrice
D Nine times

Answer: Thrice
42 The operating speed of a synchronous motor can be changed to new fixed value by
A Changing the load
B Changing the supply voltage
C Changing frequency
D Using brakes

Answer: Changing frequency
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43 The speed regulation of a synchronous motor is always
A 1%
B 0.5%
C Positive
D Zero

Answer: Zero
44 While running, a synchronous motor is compelled to run at synchronous speed because of
A Damper winding in its pole faces
B Magnetic locking between stator and rotor poles
C Induced e.m.f. in rotor field winding by stator flux
D Complusion due to Lenz's law

Answer: Magnetic locking between stator and rotor poles
45 In a synchronous motor, damper winding is provided in order to
A Stabilize rotor motion
B Suppress rotor oscillations
C Develop necessary starting torque
D Both (a) and (c)

Answer: Both (a) and (c)
46 In a synchronous motor, the rotor Cu losses are met by
A Motor input
B Armature input
C Supply lines
D D.C. source

Answer: D.C. source
47 The armature current of the synchronous motor has higher values for
A High excitation only
B Low excitation only
C Both (a) and (b)
D None of the above

Answer: Both (a) and (b)
48 The synchronous motor is not inherently self-starting because
A The force required to accelerate the rotor to the synchronous speed in an instant is absent
B The starting device to accelerate the rotor to near synchronous speed is absent
C A rotating magnetic field does not have enough poles
D The rotating magnetic field is produced by only 50 Hz frequency currents

Answer: The force required to accelerate the rotor to the synchronous speed in an instant is absent
49 A synchronous motor can be made self-starting by providing
A Damper winding on rotor poles
B Damper winding on stator
C Damper winding on stator as well as rotor poles
D None of the above

Answer: None of the above
50 Synchronous motors are generally not self-starting because
A The direction of rotation is not fixed
B The direction of instantaneous torque reverse after half cycle
C Startes cannot be used on these machiness
D Starting winding is not provided on the machines

Answer: The direction of instantaneous torque reverse after half cycle

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