In case the air gap in an induction motor is increased____________?

Related Mcqs:

1. In case the air gap in an induction motor is increased?

   A. the magnetising current of the rotor will decrease
   B. the power factor will decrease
   C. speed of motor will increase
   D. the windage losses will increase

2. The good power factor of an induction motor can be achieved if the average flux density in the air gap is___________?

   A. absent
   B. small
   C. large
   D. infinity

3. In an induction motor if air-gap is increased__________?

   A. the power factor will be low
   B. windage losses will be more
   C. bearing friction will reduce
   D. copper loss will reduce In an induction motor

4. Slip ring motor is preferred over squirrel cage induction motor where___________?

   A. high starting torque is required
   B. load torque is heavy
   C. heavy pull out torque is required
   D. all of the above

5. In case of a double cage induction motor, the inner cage has__________?

   A. high inductance arid low resistance
   B. low inductance and high resistance
   C. low inductance and low resistance
   D. high inductance and high resistance

6. The torque of an induction motor is___________?

   A. directly proportional to slip
   B. inversely proportional to slip
   C. proportional to the square of the slip
   D. none of the above

7. The torque developed in the cage induction motor with autostarter is___________?

   A. k/torque with direct switching
   B. K x torque with direct switching
   C. K2 x torque with direct switching
   D. k2/torque with direct switching

8. If any two phases for an induction motor are interchanged_______?

   A. the motor will run in reverse direction
   B. the motor will run at reduced speed
   C. the motor will not run
   D. the motor will burn

9. The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?

   A. changing supply frequency
   B. changing number of poles
   C. changing winding resistance
   D. reducing supply voltage

10. Insertion of resistance in the rotor of an induction motor to develop a given torque?

    A. decreases the rotor current
    B. increases the rotor current
    C. rotor current becomes zero
    D. rotor current rernains same