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JE 2019 || Day 20 || Induction Machines Quiz 2
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Question 1
Which one of the following is a speed control method of three-phase squirrel cage induction motor?
Question 2
A 3-phase 4 pole induction motor works on 3-phase 50 c/s supply. If the slip of the motor is 4%. The actual speed will be:
Question 3
The synchronous speed of a three phase induction motor having 20 polar and connected to a 50 Hz source is:
Question 4
Which of the following is an AC motor?
Question 5
Breakdown torque of a 3-phase induction motor of negligible stator impedance 
rotor resistance; 
rotor reactance) is
rotor resistance; rotor reactance) is Question 6
A 12-pole, 3-phase, star-connected induction motor runs at 
It has a rotor resistance of 
and stand-still reactance of 
. The slip corresponding to maximum torque under running conditions is
It has a rotor resistance of and stand-still reactance of . The slip corresponding to maximum torque under running conditions is Question 7
A 
8-pole, 3-phase induction motor has full-load slip of 4%. The rotor resistance and standstill reactance per phase are 
and 
respectively. The speed at which maximum torque occurs is
8-pole, 3-phase induction motor has full-load slip of 4%. The rotor resistance and standstill reactance per phase are and respectively. The speed at which maximum torque occurs is Question 8
For the same kVA rating, the leakage flux in induction motor is……………………that of transformer.
Question 9
A 3-phase induction motor is running at 2% slip. If the input to rotor is 
then mechanical power developed by the motor is……………..
then mechanical power developed by the motor is…………….. Question 10
The presence of a dominant 7th harmonic in the winding distribution of 3-phase, 6-pole, 
induction motor may cause the motor to crawl at a speed of about
induction motor may cause the motor to crawl at a speed of about - 716 attempts
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ESE & GATE EEGeneralApr 20ESE & GATE EE
