DC Generators - Interview Questions | Exam2Win

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26. In a four-pole D.C. machine

A. all the four poles are north poles

B. alternate poles are north and south

C. all the four poles are south poles

D. two north poles follow two south poles

Explanation:

27. 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

A. motion of conductor

B. lines of force

C. either of the above

D. none of the above

Explanation:

28. While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards

A. direction of induced e.m.f.

B. direction of flux

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

D. direction of motion of conductor, if forefinger points along the lines of flux

Explanation:

29. Fleming's right-hand rule regarding direction of induced e.m.f., correlates

A. magnetic flux, direction of current flow and resultant force

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

C. magnetic field strength, induced voltage and current

D. magnetic flux, direction of force and direction of motion of conductor

Explanation:

30. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be

A. demagnetisation only

B. cross magnetisation as well as magnetisation

C. crossmagnetisation as well as demagnetising

D. cross magnetisation only

Explanation:

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