Electrical Engineering MCQs

Page No. 241

Electrical power output in a D.C. generator is equal to_____________?


aElectrical power developed in armature – copper losses


bMechanical power input – iron and friction losses


cElectrical power developed in armature – iron and copper losses


dMechanical power input – iron and friction losses – copper losses



If a shunt motor is started with its field winding open then___________?


aIt will rotate at the same speed as that with its field winding closed


bIt will rotate at less speed as that with its field winding closed


cIt will rotate at dangerously high speed


dNone of these



The power demand can be estimated approximately by____________?


aLoad survey method


bMathematical method


c Statistical method


d Economic parameters


View Answer Statistical method

Power electronics essentially deals with control of a.c. power at____________?


aFrequencies above 20 kHz


bFrequencies above 1000 kHz


cFrequencies less than 10 Hz


d50 Hz frequency


View Answer 50 Hz frequency

A synchronous motor can develop synchronous torque:


a when under loaded


bwhile over-excited


c only at synchronous speed


dbelow or above synchronous speed



The maximum power developed in a synchronous motor will depend on__________?


athe rotor excitation only


b the supply voltage only


cthe rotor excitation and supply volt-age both


d the rotor excitation, supply voltage and maximum value of coupling angle (90°)



In a synchronous motor, the breakdown torque is__________?


adirectly proportional to the square of the applied voltage


bdirectly proportional to applied voltage


cinversely proportional to applied voltage


dnone of the above



A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?


a static condenser


b condenser


csynchronous condenser


d none of the above


View Answer synchronous condenser

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then_____________?


a the stator current will be zero


bthe stator current will be very small


cthe stator current will be very high


d the back e.m.f. will be more than the supply voltage



The coupling angle or load angle of synchronous motor is defined as the angle between the__________?


arotor and stator teeth


b rotor and the stator poles of opposite polarity


crotor and the stator poles of the same polarity


dnone of the above



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