Electrical Engineering MCQs

Page No. 241

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


aElectrical power developed in armature – copper losses

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bMechanical power input – iron and friction losses

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cElectrical power developed in armature – iron and copper losses

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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

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

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cIt will rotate at dangerously high speed

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dNone of these

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The power demand can be estimated approximately by____________?


aLoad survey method

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bMathematical method

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c Statistical method

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d Economic parameters

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View Answer Statistical method

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


aFrequencies above 20 kHz

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bFrequencies above 1000 kHz

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cFrequencies less than 10 Hz

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d50 Hz frequency

✓


View Answer 50 Hz frequency

A synchronous motor can develop synchronous torque:


a when under loaded

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bwhile over-excited

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c only at synchronous speed

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dbelow or above synchronous speed

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


athe rotor excitation only

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b the supply voltage only

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cthe rotor excitation and supply volt-age both

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

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In a synchronous motor, the breakdown torque is__________?


adirectly proportional to the square of the applied voltage

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bdirectly proportional to applied voltage

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cinversely proportional to applied voltage

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dnone of the above

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


a static condenser

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b condenser

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csynchronous condenser

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d none of the above

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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

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bthe stator current will be very small

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cthe stator current will be very high

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

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


arotor and stator teeth

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b rotor and the stator poles of opposite polarity

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crotor and the stator poles of the same polarity

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dnone of the above

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