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SSC JE EE: Electrical Machine Booster Quiz-7

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Question 1

Find the number of poles required, if the frequency is 50Hz and speed of the motor is 500 rpm.

Question 2

A synchronous generator generates reactive power while working at

Question 3

The difference between the stator synchronous speed and rotor speeds id called

Question 4

The synchronous motor is not inherently self-starting because

Question 5

15 minutes rated motors are suitable for ______________.

Question 6

The high-voltage and low-voltage winding resistances of a distribution transformer of 100 KVA, 1100/220 volts, 50 Hz are 0.1 Ω and 0.004 Ω respectively. The equivalent resistances referred to high-voltage side and low-voltage side respectively are

Question 7

A 480 V,60 Hz,50 HP 3-phase induction motor is drawing power at 0.85 p.f. lagging. The stator copper losses are 2 kW and the rotor copper losses are 700W. The friction and windage losses are 600 W and the stator iron losses are

The air-gap power is

Question 8

If static voltage of a squirrel cage induction motor is reduced to 50 percent of its rated value, torque developed is reduced by how many percentage of its full load value?

Question 9

In three phase induction motor the initial inrush of current is to produce

Question 10

The oscillations in a synchronous motor can be damped out by

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AE & JE Exams

Nov 22AE & JE Exams