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. The stating torque of the slip ring induction motor can be increased by adding__________?

   A. external inductance to the rotor
   B. external resistance to the rotor
   C. external capacitance to the rotor
   D. both resistance and inductance to rotor

5. The starting torque of a three phase induction motor can be increased by__________?

   A. increasing slip
   B. increasing current
   C. both A. and (b)
   D. none of the above

6. 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

7. 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

8. An induction motor with 1000 r.p.m. speed will have____________?

   A. 8 poles
   B. 6 poles
   C. 4 poles
   D. 2 poles

9. 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

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