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RRB/SSC JE Electrical 2019 || Weekly Quiz 8
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Question 1
Breakdown torque of a 3-phase induction motor of negligible stator impedance 
rotor resistance; 
rotor reactance) is
rotor resistance; rotor reactance) is Question 2
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 3
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 4
For the same kVA rating, the leakage flux in induction motor is……………………that of transformer.
Question 5
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 6
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 Question 7
In a 3-phase induction motor, the mechanical power developed in terms of air gap power 
is
is Question 8
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 9
A 
4-pole, 
Y-connected induction motor has a full-load slip of 5%. The shaft torque of the motor at rated load is
4-pole, Y-connected induction motor has a full-load slip of 5%. The shaft torque of the motor at rated load is Question 10
The rotor power output of a 3-phase induction motor is 15kW. The rotor copper losses at a slip of 4% will be
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