Electrical Engineering MCQs

Page No. 294

Which D.C. motor is generally preferred for cranes and hoists ?


aSeries motor

✓


bShunt motor

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cCumulatively compounded motor

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d Differentially compounded motor

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View Answer Series motor

In D.C. machines the residual magnetism is of the order of_________________?


a2 to 3 per cent

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b10 to 15 per cent

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c20 to 25 per cent

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d50 to 75 per cent

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View Answer 2 to 3 per cent

For which of the following applications a D.C. motor is preferred over an A.C. motor ?


aLow speed operation

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bHigh speed operation

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cVariable speed operation

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dFixed speed operation

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The condition for maximum power in case of D.C. motor is______________?


a back e.m.f. = 2 x supply voltage

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bback e.m.f. = | x supply voltage

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csupply voltage = | x back e.m.f

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dsupply voltage = back e.m.f

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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?


a4.0

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b2.0

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c1.0

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d 0.5

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View Answer 0.5

Which one of the following is not the function of pole shoes in a D.C. machine ?


aTo reduce eddy current loss

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bTo support the field coils

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cTo spread out flux for better uniformity

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d To reduce the reluctance of the magnetic path

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If the supply voltage for a D.C. motor is increased, which of the following will decrease ?


aStarting torque

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bOperating speed

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cFull-load current

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dAll of the above

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View Answer Full-load current

Which of the following motor is preferred for operation in highly explosive atmosphere ?


aSeries motor

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bShunt motor

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c Air motor

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d Battery operated motor

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View Answer Air motor

Sparking at the commutator of a D.C. motor may result in____________?


adamage to commutator segments

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bdamage to commutator insulation

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cincreased power consumptionQ

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d all of the above

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View Answer all of the above

In case of conductively compensated D.C. series motors, the compensating winding is provided______________?


aas separately wound unit

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bin parallel with armature winding

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cin series with armature winding

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din parallel with field winding

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