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GATE 2019: Electrical Machines Quiz 10
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Question 1
A squirrel cage induction motor having a rated slip of 2% on full load has a starting torque of 50% of full load torque. The starting current is
Question 2
On the torque/speed curve of induction motor shown in the following figure, four points of operation are market as W, X, Y and Z. Which one of them represents theoperation at a slip greater than 1?
Question 3
The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8 pole 50 Hz induction machine is
Question 4
A 3 phase, 10 kW, 400 V, 4 pole, 50 Hz, star connected inductance motor has following circuit parameters 
.The starting torque when the motor is started direct on line (use approximate equivalent circuit model)
.The starting torque when the motor is started direct on line (use approximate equivalent circuit model) Question 5
A 3–phase Inductor Motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following statements relate to the new condition if stator resistance, leakage reactance and core loss are ignored.
P The difference between synchronous speed and actual speed remains same
Q The air–gap flux remains same
R The stator current remains same
S The p.u. slip remains same
Among the above, correct statements are
P The difference between synchronous speed and actual speed remains same
Q The air–gap flux remains same
R The stator current remains same
S The p.u. slip remains same
Among the above, correct statements are
Question 6
A three-phase squirrel cage induction motor has a starting torque of 150% and a maximum torque of 300% with respect to rated torque at rated voltage and rated frequency. Neglect the stator resistance and rotational losses. The value of slip for maximum torque is
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