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JE 2019 || Day 21 || Induction Machines Quiz 3

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Question 1

In a 3-phase induction motor, the mechanical power developed in terms of air gap power

Question 2

A 3-phase slip-ring induction motor develops rates torque at a slip of 0.05 with slip-rings short-circuited. If the rotor resistance is increased to four times by inserting external resistance in the rotor circuit, then at rated torque, the slip would be

Question 3

4-pole,

Y-connected induction motor has a full-load slip of 5%. The shaft torque of the motor at rated load is

Question 4

The rotor power output of a 3-phase induction motor is 15kW. The rotor copper losses at a slip of 4% will be

Question 5

The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

Question 6

A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The supply frequency is 50 Hz. The slip of the motor is

Question 7

A 3-phase induction motor with a synchronous speed of

develops 5 mechanical h.p. at

What is the stator input if the stator loss is

Question 8

The power input to the rotor of a

6-pole, 3-phase induction motor is 80 kW. The rotor e.m.f. is observed to make 100 complete cycles per minute. What is the mechanical power developed?

Question 9

A 3-phase, 6-pole,