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


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


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


b Iron losses in the stator


cWindage losses


dNone of the above


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


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


b low excitation only


cboth high and low excitation


dnone of the above



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