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


b10 percent


c15 percent


d30 percent


View Answer 15 percent

Power transformers have rating_______________?


aequal to 50 kVA


b equal to 100 kVA


cabove 200 kVA


dnone of the above


View Answer above 200 kVA

____________are always double layer type?


aClosed windings


bOpen windings


c Either of the above


dNone of the above


View Answer Closed windings

The winding where dummy coils are used is sometimes called______________?


aduplex winding


btriplex winding


cforced winding


dnone of the above


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


bfull pitch


ceither of the above


d none of the above


View Answer full pitch

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


afront pitch


bwinding pitch


ccommutator pitch


d back pitch


View Answer winding pitch

Dummy coil should not be used in_________________?


a small machines


blarge machines


ceither A. or B.


d none of the above


View Answer large machines

Power transformers should be designed to have maximum efficiency________________?


a at one-fourth load


bat one-half load


cat or near full load


d any of the above


View Answer at or near full load

Yokes with rectangular cross-section are used for_______________?


asmall capacity transformers


b medium capacity transformers


c large capacity transformers


dany of the above



Which of the following methods is most accurate ?


aEquivalent current method


b Equivalent power method


cEquivalent torque method


d Method of average losses



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