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JE 2019 || Day 19 || Induction Machines Quiz 1

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Question 1

8-pole, 3-phase induction motor has full-load slip of 4%. The rotor resistance and standstill reactance per phase are

and

respectively. The ratio of maximum torque to full-load torque is

Question 2

The starting torque of a 3-phase induction motor has maximum value. The rotor power factor is then

Question 3

A 6-pole, 3-phase induction motor is connected to a 25 Hz supply and at full-load the rotor e.m.f. makes 105 complete cycles in 2 minutes. The full-load rotor speed is

Question 4

An 8-pole alternator runs at

and supplies power to a 6-pole induction motor which has a full-load slip of 3%. The full-load speed of the motor is

Question 5

For higher efficiency of 3-phase induction motor, the slip should be……………..

Question 6

If the slip of a 3-phase induction motor increases, the p.f. of the rotor circuit ………………………

Question 7

The reactance of the rotor circuit of a 3-phase induction motor is maximum at …………….

Question 8

A wound rotor motor is manly used in applications where…………………

Question 9

In below Figure, the rotor frequency is ……………..when the motor is at standstill.

Question 10

A 4 – pole, 3 – phase induction motor runs at 1440 rpm on a 50 Hz supply. Find the slip speed.

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ESE & GATE EE General

Apr 19ESE & GATE EE