Electrical Engineering MCQs

Page No. 95

In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?


a5 percent

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b10 percent

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c15 percent

✓


d30 percent

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View Answer 15 percent

Power transformers have rating_______________?


aequal to 50 kVA

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b equal to 100 kVA

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cabove 200 kVA

✓


dnone of the above

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View Answer above 200 kVA

____________are always double layer type?


aClosed windings

✓


bOpen windings

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c Either of the above

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dNone of the above

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View Answer Closed windings

The winding where dummy coils are used is sometimes called______________?


aduplex winding

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btriplex winding

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cforced winding

✓


dnone of the above

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View Answer forced winding

When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?


a short pitch

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bfull pitch

✓


ceither of the above

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d none of the above

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View Answer full pitch

The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?


afront pitch

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bwinding pitch

✓


ccommutator pitch

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d back pitch

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View Answer winding pitch

Dummy coil should not be used in_________________?


a small machines

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blarge machines

✓


ceither A. or B.

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d none of the above

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View Answer large machines

Power transformers should be designed to have maximum efficiency________________?


a at one-fourth load

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bat one-half load

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cat or near full load

✓


d any of the above

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View Answer at or near full load

Yokes with rectangular cross-section are used for_______________?


asmall capacity transformers

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b medium capacity transformers

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c large capacity transformers

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dany of the above

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Which of the following methods is most accurate ?


aEquivalent current method

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b Equivalent power method

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cEquivalent torque method

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d Method of average losses

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