The power factor of an induction motor under no-load conditions will be closer to_____________?

Related Mcqs:

1. 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

2. The low power factor of induction motor is due to___________?

   A. rotor leakage reactance
   B. stator reactance
   C. the reactive lagging magnetizing current necessary to generate the magnetic flux
   D. all of the above

3. In an induction motor, no-load the slip is generally____________?

   A. less than 1%
   B. 1.5%
   C. 2%
   D. 4%

4. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?

   A. will continue running burning its one phase
   B. will continue running burning its two phases
   C. will stop and carry heavy current causing permanent damage to its winding
   D. will continue running without any harm to the winding

5. A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?

   A. will continue running burning its one phase
   B. will continue running burning its two phase
   C. will stop and carry heavy current causing permanent damage to its winding
   D. will continue running without any harm to the winding

6. As load on an induction motor goes on increasing______________?

   A. its power factor goes on decreasing
   B. its power factor remains constant
   C. its power factor goes on increasing even after full load
   D. its power factor goes on increasing up to full load and then it falls again

7. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be__________?

   A. 0.01
   B. 0.02
   C. 0.03
   D. 0.04

8. 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

9. The power scale of circle diagram of an induction motor can be found from__________?

   A. stator resistance test
   B. no-load test only
   C. short-circuit test only
   D. noue of the above

10. The torque of a rotor in an induction motor under running condition is maximum__________?

    A. at the unit value of slip
    B. at the zero value of slip
    C. at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
    D. at the value of the slip which makes the rotor reactance half of the rotor