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Question (1)

QN0039252

A six pole generator with fixed field excitation develops an e.m.f. of 100 V when operating at 1500 r.p.m. At what speed must it rotate to develop 120V?

(A)
1200 r.p.m
(B)
1800 r.p.m
(C)
1500 r.p.m
(D)
400 r.p.m

Correct Answer: B

Explanation:

The e.m.f. induced is directly proportional to rate at which flux is intercepted which in turn varies directly as the speed of rotation of the generator.

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Question (2)

QN0039253

When the plane of the armature of a generator is parallel to the field. in which it is rotating

(A)
both the flux linked and induced emf in the coil are zero.
(B)
the flux linked with it is zero, while induced emf is maximum.
(C)
flux linked is maximum while induced emf is zero.
(D)
both the flux and emf have their respective maximum values.

Correct Answer: B

Explanation:

As

maximum

is the angle between the field and normal to the plane of the coil.

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Question (3)

QN0039254

A generator has an e.m.f. of 440 Volt and internal resistance of . Its terminals are connected to a load of 4000 ohm. The voltage across the load is

(A)
220 volt
(B)
440 volt
(C)
200 volt
(D)
400 volt

Correct Answer: D

Explanation:

Total resistance of the circuit

Current flowing .

Voltage across load volt.

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Question (1)

A six pole generator with fixed field excitation develops an e.m.f. of 100 V when operating at 1500 r.p.m. At what speed must it rotate to develop 120V?

Explanation:

Link:

Question (2)

When the plane of the armature of a generator is parallel to the field. in which it is rotating

Explanation:

Link:

Question (3)

A generator has an e.m.f. of 440 Volt and internal resistance of . Its terminals are connected to a load of 4000 ohm. The voltage across the load is

Explanation:

Link:

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