engineering recuitment PGCIL Diploma Trainee Mock Test 2024 Electrical Machines Three Phase Induction Motor
A 400 V, 50 Hz, 4-pole, three phase induction motor cannot run at 1500 rpm because:
1
At 1500 rpm there will be no emf inducted in the rotor circuit and hence no torque will be developed
2
At 1500 rpm, the rotor will draw excessive current and may be harmful to the motor
3
An induction motor can run only at a speed higher than its synchronous speed
4
At 1500 rpm, torque developed by the rotor may not sufficient to rotate the rotor