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ESE 2021 Technical Quiz || Three Phase Induction Machines 1
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Question 1
A 3-phase induction motor is running in opposite direction to the rotating field. Determine the slip of the motor.
Question 2
When the speed of the 3-phase induction motor is very near to the synchronous speed, the torque developed is:
Question 3
A 3 phase induction motor is a 4-pole machine running on 50 Hz supply. It has rotor resistance and stand still reactance of 0.21 Ω/phase and 2.1 Ω/phase respectively. If starting torque of the motor is 30 N-m, then rotor voltage (in Volts) at standstill will be
Question 4
The starting torque of an auto transformer starter for 40KW, 400V 3-phase induction motor is 68% of full load torque. Assume the slip at full load to be 4.5% and SC current to be six times the full load current. What is the transformation ratio?
Assume. Ignore the magnetizing current of transformer and motor.
Assume. Ignore the magnetizing current of transformer and motor.
Question 5
In which of the following motors rotor resistance speed control is used?
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