DC Generators - Interview Questions | Exam2Win

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61. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when

A. there is no load on|he generator

B. the generator runs on full load

C. the generator runs on overload

D. the generator runs on designed speed

Explanation:

62. Interpole flux should be sufficient to

A. neutralise the commutating self induced e.m.f.

B. neutralise the armature reaction flux

C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil

D. perform none of the above functions

Explanation:

63. In D.C. generators on no-load, the air gap flux distribution in space is

A. sinusoidal

B. triangular

C. pulsating

D. flat topped

Explanation:

64. The e.m.f. generated in a D.C. generator is directly proportional to

A. flux/pole

B. speed of armature

C. number of poles

D. all of the above

Explanation:

65. Flashing the field of D.C. generator means

A. neutralising residual magnetism

B. creating residual magnetism by a D.C. source

C. making the magnetic losses of forces parallel

D. increasing flux density by adding extra turns of windings on poles

Explanation: