Electrical Engineering MCQs

Page No. 285

The resistance of armature winding depends on


alength of conductor

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b cross-sectional area of the conductor

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cnumber of conductors

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dall of the above

✓


View Answer all of the above

The field coils of D.C. generator are usually made of_____________?


a mica

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b copper

✓


c cast iron

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d carbon

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View Answer copper

In a commutator_____________?


a copper is harder than mica

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bmica and copper are equally hard

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cmica is harder than copper

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d none of the above

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According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?


amotion of conductor

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b lines of force

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ceither of the above

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dnone of the above

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View Answer lines of force

While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?


adirection of induced e.m.f.

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bdirection of flux

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cdirection of motion of the conductor if forefinger points in the direction of generated e.m.f

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ddirection of motion of conductor, if forefinger points along the lines of flux

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In D.C. generators the pole shoes are fastened to the pole core by_____________?


arivets

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bcounter sunk screws

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cbrazing

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d welding

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View Answer counter sunk screws

Fleming’s right-hand rule regarding direction of induced e.m.f., correlates__________?


a magnetic flux, direction of current flow and resultant force

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bmagnetic flux, direction of motion and the direction of e.m.f. induced

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cmagnetic field strength, induced voltage and current

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d magnetic flux, direction of force and direction of motion of conductor

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In case of D.C. machines, mechanical losses are primary function of____________?


acurrent

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b voltage

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c speed

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dnone of above

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View Answer speed

Copper brushes in D.C. machine are used_____________?


a where low voltage and high currents are involved

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b. where high voltage and small cur-rents are involved

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c in both of the above cases

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d in none of the above cases

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For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f___________ ?


aLap winding

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bWave winding

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cEither of A. and B. above

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dDepends on other features of design

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View Answer Wave winding

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