Electrical Engineering MCQs

Page No. 252

An important advantage of a synchronous motor over wound round induction motor is that


a its power factor may be varied at will

✓


bits speed is independent of supply frequency

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cits speed may be controlled more easily

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dnone of the above

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The angle between the rotating stator flux and rotor poles is called _________ angle.


a synchronizing

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bobtuse

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ctorque

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dpower factor

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View Answer torque

Slip-rings in a synchronous motor carry____________?


adirect current

✓


balternating current

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cno current

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dall of the above

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View Answer direct current

A synchronous motor working at leading power factor can be used as____________?


avoltage booster

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b phase advancer

✓


cnoise generator

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dmechanical synchronizer

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View Answer phase advancer

The standard full-load power factor ratings for synchronous motors are___________?


azero or 0.8 leading

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bunity or 0.8 lagging

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cunity or 0.8 leading

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dunity or zero

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View Answer unity or 0.8 leading

The rotor copper losses, in a synchronous motor, are met by____________?


ad.c. source

✓


barmature input

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cmotor input

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dsupply lines

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View Answer d.c. source

A synchronous motor will always stop when:______________?


asupply voltage fluctuates

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bload in motor varies

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cexcitation winding gets disconnected

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dsupply voltage frequency changes

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The speed regulation of a synchronous motor is always___________?


a1%

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b0.5%

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cpositive

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dzero

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View Answer zero

. In a synchronous motor which loss varies with load ?


aWindage loss

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bBearing friction loss

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cCopper loss

✓


dCore loss

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View Answer Copper loss

For V-curves for a synchronous motor the graph is drawn between:_______________?


a armature current and power factor

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bterminal voltage and load factor

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cpower factor and field current

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d field current and armature current

✓



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