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SSC JE EE: Electrical Machine Booster Quiz-5

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Question 1

Which method of voltage regulation of alternator give greater value of regulation than its actual value.

Question 2

In dc generator, field flashing is done for:

Question 3

The maximum efficiency occurs in a separately excited d.c. generator when the terminal voltage is 220 V and the induced emf is 240 V, the stray losses, if the armature resistance is 0.2 ohm, will be

Question 4

The phenomenon of oscillations of rotor about its final equilibrium position is termed as:

Question 5

The steady-state external performance characteristic of a d.c. generator has the relationship between

Question 6

A synchronous generator works at half full load and connect with an infinite bus. If we increase the field current, armature current I_a reduces. The operating power factor of synchronous generator is

Question 7

A 250-volt DC generator has an armature resistance of 0.1Ω, shunt field resistance is 50Ω, and series field winding is 0.1 Ω, the load current is 100A at 250V. what will be the induced voltage if machine connected in long shunt?

Question 8

For DC shunt motor, to increase speed above the rated speed.

1. Flux per pole can be reduced.

2. Field current can be reduced.

Choose the correct option:

Question 9

In an alternator, field winding and armature winding is placed at?

Question 10

The term Synchronous condenser refers to

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Nov 21AE & JE Exams