# Objective Questions on Torque Equation of Three Phase Induction Motor

1. The torque developed by a 3-phase induction motor is approximately proportional to

Under construction.

2. The frequency of rotor currents at standstill is equal to

Under construction.

3. Insertion of resistance in the rotor circuit of an induction motor to develop a given torque causes ______________ in the rotor current.

Under construction.

4. The torque developed in an induction motor is nearly proportional to

Under construction.

5. The starting torque of a 3-phase induction motor varies as

Under construction.

6. For a constant torque load, the supply voltage of squirrel cage induction motor is reduced by a factor of 0.707, its rotor electric current is modified by a factor

Under construction.

7. In a 3-phase induction motor, the starting torque will be maximum when

Under construction.

8. The starting torque of a squirrel cage induction motor is

Under construction.

9. For achieving high starting torque and high operation efficiency an induction motor should have ________________ rotor circuit resistance at starting and ________________ circuit resistance under operating condition.

Under construction.

10. In a 3-phase induction motor, if stator impedance is neglected, then slip at maximum torque equal to

Under construction.

11. Breakdown torque of a 3-phase induction motor of negligible stator impedance is

Under construction.

12. Beyond the point of maximum torque any further increase in load will cause

Under construction.

13. In an induction motor, maximum torque varies as

Under construction.

14. Pull out torque in an induction motor occurs when power factor becomes

Under construction.

15. On decreasing the applied rated voltage/phase by one half, the starting torque of an induction motor becomes times of starting torque with full voltage

Under construction.

16. For 4 % drop in supply voltage, the torque of an induction motor increase by

Under construction.

17. In an induction motor, the torque in Nm is given as

Under construction.

18. If a motor shows symptoms of loss of torque with excessive vibrations, it can be concluded that

Under construction.

19. If the slip of the rotor of an induction motor is halved, the value of rotor reactance

Under construction.

20. The condition for maximum torque of the rotor of an induction motor is

Under construction.