Electrical Engineering MCQs

Page No. 93

The laminations of the armature of a D.C. machine are usually ___________ thick?


a0.1 to 0.2 mm

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b0.2 to 0.3 mm

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c0.3 to 0.4 mm

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d0.4 to 0.5 mm

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View Answer 0.4 to 0.5 mm

D.C. servomotors are used in______________?


apurely D.C. control systems

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bpurely AC. control systems

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c both D.C. and AC. control systems

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dnone of the above

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The cylindrical windings using circular conductors are used for current rating of____________?


aupto 20 A

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b upto 40 A

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cupto 60 A

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dupto 80 A

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View Answer upto 80 A

Which of the following in an application of D.C. motors?


aTraction

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bDrives for process industry

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cBattery driven vehicles

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dAll of the above

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View Answer All of the above

The stator of a D.C. machine comprises of_____________?


amain poles

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binterpoles

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c frame

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d all of the above

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View Answer all of the above

is usually used for brush rockers____________?


aMild steel

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bCopper

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cAluminium

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dCast-iron

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View Answer Cast-iron

Which of the following brushes can be used for high values of current density ?


aMetal graphite brushes

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bHard carbon brushes

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cElectro-graphitic brushes

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dNatural graphite brushes

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Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?


a Increased I R losses

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bIncreased core losses

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cPoor commutation

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dAll of the above

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View Answer All of the above

In a D.C. machine the number of brush arms is _________ the number of poles?


a less than

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bequal to

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cgreater than

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d none of the above

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View Answer equal to

D.C. machines designed with a large value of air gap length have_____________?


aworst, ventilation

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bpoor ventilation

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cbetter ventilation

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dnone of the above

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View Answer better ventilation

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