Electrical Engineering MCQs

Page No. 245

While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerating torque is produced by_____________?


ainduction motor torque in field winding


b induction motor torque in damper winding


ceddy current and hysteresis torque in pole faces


dall of the above methods



A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will___________?b


aremain same


bgo down


cimprove


dnone of the above


View Answer improve

Which of the following motors will be used in electric clocks?


aD.C. shunt motor


bD.C. series motor


cA.C. induction motor


dA.C. synchronous motor



Power factor of a synchronous motor is unity when_____________?


athe armature current is maximum


bthe armature current is minimum


cthe armature current is zero


dnone of the above



Which of the following methods is used to start a synchronous motor?


aDamper winding


b Star-delta starter


cDamper winding in conjunction with star-delta starter


dResistance starter in the armature circuit



In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately


aone-third


btwice


cthrice


d six times


View Answer thrice

A synchronous machine with large air gap has______________?


a higher value of stability limit


ba small value of inherent regulation


c a higher synchronizing power which makes the machine less sensitive to load variations


dall of the above


View Answer all of the above

To limit the operating temperature an electrical machine should have proper____________?


avoltage rating


bcurrent rating


cpower factor


dspeed


View Answer current rating

When the voltage applied to a synchronous motor is increased, which of the following will reduce?


aStator flux


b Pull in torque


c Both A. and (b)


dNone of the above


View Answer None of the above

An over excited synchronous motor is used for____________?


afluctuating loads


bvariable speed loads


clow torque loads


d power factor corrections



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