Electrical Engineering MCQs

Page No. 242

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as__________?


alocked-rotor torque

✓


bsynchronous torque

✖


cpull up torque

✖


dreluctance torque

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View Answer locked-rotor torque

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?


astop

✓


brun as induction motor

✖


c function as static condenser

✖


dburn with dense smoke

✖


View Answer stop

A synchronous machine with low value of short-circuit ratio has___________?


alower stability limit

✓


bhigh stability limit

✖


cgood speed regulation

✖


dgood voltage regulation

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View Answer lower stability limit

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as___________?


apull-up torque

✖


bpull-in torque

✓


cpull-out torque

✖


dnone of the above

✖


View Answer pull-in torque

The construction of a synchronous motor resembles____________?


a a series motor

✖


ban induction motor

✖


can alternator

✓


da rotary converter

✖


View Answer an alternator

For power factor correction, synchronous motors operate at____________?


a no-load and greatly over-excited fields

✓


bno-load and under-excited fields

✖


cnormal load with minimum excitation

✖


d normal load with zero excitation

✖



Which of the following losses is not dissipated by the stator core surface in a synchronous motor?


aEddy current losses in the conductors

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b Iron losses in the stator

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cWindage losses

✓


dNone of the above

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View Answer Windage losses

The size of a synchronous motor decreases with the increase in___________?


aflux density

✓


bhorse power rating

✖


cspeed

✖


dall of the above

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View Answer flux density

Which of the following losses, in a synchronous motor, does not vary with load?


aWindage loss

✓


bCopper losses

✖


cAny of the above

✖


d None of the above

✖


View Answer Windage loss

In a synchronous motor, the armature current has large values for____________?


a high excitation only

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b low excitation only

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cboth high and low excitation

✓


dnone of the above

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