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GATE EE 2018 EXAM:Electrical Machines Quiz 9
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Question 1
The stator loss of a 3-phase induction motor is 2 kW. If the motor is running with a slip of 4% and power input of 90 kW, then what is the rotor mechanical power developed?
Question 2
For a 3-phase induction motor, what fraction/multiple of supply voltage is required for a direct-on-line starting method such that starting current is limited to 5 times the full-load current and motor develops 1.5 times full-load torque at starting time? Assume slip is 0.04.
Question 3
If a 3-phase slip ring induction motor is fed from the rotor side with stator winding short circuited, then frequency of currents flowing in the short circuited stator is
Question 4
A 3-phase, induction motor operating at a slip of 5% develops 20 kW rotor power output. What is the corresponding rotor copper loss in this operating condition?
Question 5
The reversing of a 3ϕinduction motor is achieved by
Question 6
In squirrel cage motors, heating issue results due to:
Question 7
When an electric power is fed to the stator of an induction motor, then the motor stator input comprises of:
i. Stator output
ii. Rotor losses
iii. Stator Iron loss
iv. Stator Cu loss
i. Stator output
ii. Rotor losses
iii. Stator Iron loss
iv. Stator Cu loss
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Jun 14ESE & GATE EE
