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GATE EE 2018 EXAM:Electrical Machines Quiz 10
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Question 1
If a 400V, 50 Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400 V, 75 Hz supply, the torque that the motor can now provide while drawing rated current from the supply?
Question 2
The rotor frequency of a 3-phase, 5 kW, 400 V, 50 Hz, 4-pole slip ring induction motor is 25 Hz. The speed of the motor when connected to a 400 volt, 50 Hz supply will be
Question 3
A 6-pole, 50 Hz, 3-phase induction motor with a rotor resistance of 0.25 Ω develops a maximum torque of 10 Nm at 875 rpm. The rotor reactance and slip at maximum torque is
Question 4
The power input to a 500V 50Hz, 6 pole, 3 φ squirrel case inductor motor running at 975 r.p.m. is 40kw. The stator losses are 1 kw and friction and windage losses are 2kw. Find:
1) Slip
2) Rotor Cu loss
3) Brake hp
Question 5
Statement (i): The main function of a starter in a 3-phase induction motor is to provide starting torque.
Statement (ii): The 3-phase induction motor is a self-starting motor.
Statement (ii): The 3-phase induction motor is a self-starting motor.
Question 6
Assertion (A): A squirrel cage induction motor is preferred over the slip ring induction motor.
Reason (R): Higher starting torque is the main consideration for choosing squirrel cage induction motor.
Reason (R): Higher starting torque is the main consideration for choosing squirrel cage induction motor.
Question 7
The rated slip of an induction motor at full-load is 5% while the ratio of starting current to full load current is four. The ratio of the starting torque to full load torque would be
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Jun 18ESE & GATE EE
