Electrical Engineering MCQs

Page No. 294

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


aSeries motor


bShunt motor


cCumulatively compounded motor


d Differentially compounded motor


View Answer Series motor

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


a2 to 3 per cent


b10 to 15 per cent


c20 to 25 per cent


d50 to 75 per cent


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


bHigh speed operation


cVariable speed operation


dFixed speed operation



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


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


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


csupply voltage = | x back e.m.f


dsupply voltage = back e.m.f



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


b2.0


c1.0


d 0.5


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


bTo support the field coils


cTo spread out flux for better uniformity


d To reduce the reluctance of the magnetic path



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


aStarting torque


bOperating speed


cFull-load current


dAll of the above


View Answer Full-load current

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


aSeries motor


bShunt motor


c Air motor


d Battery operated motor


View Answer Air motor

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


adamage to commutator segments


bdamage to commutator insulation


cincreased power consumptionQ


d all of the above


View Answer all of the above

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


aas separately wound unit


bin parallel with armature winding


cin series with armature winding


din parallel with field winding



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