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Electrician Set-1
Synchronous Motors
10

Synchronous Motors MCQ - Electrician (Set-1) with Answers

10) While running a synchronous motor is compelled to run at synchronous speed because of

damper winding in its pole faces

magnetic locking between stator and rotor poles

induced e.m.f. in rotor field winding by stator flux

compulsion due to Lenz's law

Answer is:

magnetic locking between stator and rotor poles

Synchronous Motors MCQ - Electrician (Set-1) with Answers

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Related Synchronous Motors MCQ - Electrician (Set-1) with Answers

11) The V-curves of a synchronous motor show relationship between

excitation current and back e.m.f.

field current and power factor

D.C. field current and A.C. armature current

armature current and supply voltage

Answer is:

D.C. field current and A.C. armature current

12) A synchronous motor running with normal excitation adjusts to load increases essentially by increase in its

power factor

torque angle

back e.m.f.

armature current

Answer is:

armature current

13) The angle between the synchronously rotating stator flux and rotor poles of a synchronous motor is called _____ angle

synchronzing

torque

power factor

slip

Answer is:

torque

14) A synchronous motor is started on :

lagging power factor only

leading power factor only

both types of power factors i.e., lagging and leading

none of the above

Answer is:

both types of power factors i.e., lagging and leading

Synchronous Motors MCQ - Electrician (Set-1) with Answers

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