Electrical Machines-Three Phase Induction Motors [GATE (Graduate Aptitude Test in Engineering) Electrical Engineering (EE)]: Questions 1 - 3 of 18

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Question 1

Appeared in Year: 2020

Question Numeric Answer▾

A three phase, 50 Hz, 4-pole induction motor runs at no-load with a slip of 1% . With full load, the slip increases to 5% . The % speed regulation of the motor (rounded off to 2 decimal places) is ________

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Question 2

Appeared in Year: 2010

Question MCQ▾

A separately excited dc motor runs at 1500 rpm under no load with 200 V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm is 1400 rpm. The rotational and armature reaction are neglectedThe armature resistance of the motor is

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Choices

Choice (4)Response

a.

7.7 Ω

b.

4.4 Ω

c.

2 Ω

d.

3.4 Ω

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Question 3

Appeared in Year: 2010

Question MCQ▾

A balanced three-phase voltage is applied to a star-connected induction motor, the phase to neutral voltage being V, The stator resistance, rotor resistance referred to the stator, stator leakage reactance. rotor leakage reactance referred to the stator, and the magnetizing reactance are denoted by r1, r2, xp. xm and Xth respectively. The magnitude of the starting current of the motor is given by:

Choices

Choice (4)Response

a.

b.

c.

d.

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