Electrical Engineering MCQs

Page No. 94

In D.C. machines the usual limit of slot pitch is________________?


abetween 5 to 10 mm


bbetween 10 to 15 mm


cbetween 15 to 20 mm


dbetween 25 to 35 mm


View Answer between 25 to 35 mm

The operation of a D.C. machine with large air gap lengths is comparatively_____________?


aquiet


bnoisy


ceither of the above


dnone of the above


View Answer quiet

In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made____________?


aequal to that of armature mmf


bless in comparison with the armature mmf


c large in comparison with the armature mmf


d none of the above



In a D.C. machine, the value of peripheral speed should not, normally, exceed___________? 0


a10 m/s


b 20 m/s


c30 m/s


d40 m/s


View Answer 30 m/s

The weight of copper of both armature and field windings decreases with __________ in number of poles?


a increase


bdecrease


ceither of the above


dnone of the above


View Answer increase

In a D.C. machine the current per brush arm should not be more than_____________?


a100 A


b 200 A


c 300 A


d400 A


View Answer 400 A

In D.C. machines the width of the duct is usually_____________?


a4 mm


b 6 mm


c8 mm


d 10 mm


View Answer 10 mm

In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?


a increase


bdecrease


ceither of the above


dnone of the above


View Answer increase

Which of the following methods may be adopted to reduce the effects of armature reaction ?


aIncrease in length of air gap at pole tips


bIncreasing reluctance of pole tips


cInterpoles


d All of the above


View Answer All of the above

In D.C. machines the number of slots per pole usually lies___________?


abetween 2 to 4


bbetween 6 to 8


c between 9 to 16


d between 20 to 30


View Answer between 9 to 16

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