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SSC JE EE: Electrical Machine Booster Quiz-9

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Question 1

Which of the following is a correct statement about a series motor?

Question 2

The wave form of the armature m.m.f. in DC machine is ________.

Question 3

The commutator in a DC machine acts as

Question 4

A 3-phase synchronous motor driving a constant load is drawing power from an infinite bus-bar at a leading power factor. With the increase in excitation, the

Question 5

The no load primary current I₀ is about ____ of full load primary current of a transformer.

Question 6

An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of revolving magnetic field. The frequency of rotor current is:

Question 7

What will be the effect on SCR (short circuit ratio) if an air gap of an alternator is increased.

Question 8

In dc machine iron losses cause

Question 9

For a dc machine shunt resistance and armature resistance values are

Question 10

No-load test on induction motor is conducted to find which of the following losses?

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