Electrical Engineering MCQs

Page No. 100

The length cf air gap to be provided in __________ is primarily determined by power factor consideration?


ad.c. series motor

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bd.c. shunt motor

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cinduction motor

✓


dsynchronous motor

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View Answer induction motor

The design of mechanical parts is particularly important in case of __________ speed machines?


alow

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bmedium

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c high

✓


dany of the above

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View Answer high

impose limitation on design____________?


a Saturation

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b Temperature rise

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cEfficiency

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d All above

✓


View Answer All above

If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?


adrastically increased

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bdrastically reduced

✓


cunaffected

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dnone of the above

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View Answer drastically reduced

Electrical machines having a power output up to about 750 W may be called__________machines?


asmall size

✓


b medium size

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clarge size

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d any of the above

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View Answer small size

In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?


a low power factor

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bhigh power factor

✓


chigh over load capacity

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dany of the above

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View Answer high power factor

Which of the following is the major consideration to evolve a good design ?


aCost

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b Durability

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cCompliance with performance criteria as laid down in specifications

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dAll of the above

✓


View Answer All of the above

The efficiency of a machine should be as ____________ as possible to reduce the operating cost?


ahigh

✓


blow

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c either of the above

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dnone of the above

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View Answer high

Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?


asmall size machines

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bmedium size machines

✓


c large size machines

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dany of the above

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View Answer medium size machines

In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?


asmall

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bmedium

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clarge

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d any of the above.

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View Answer large

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