A. rotor leakage reactance
B. stator reactance
C. the reactive lagging magnetizing current necessary to generate the magnetic flux
D. all of the above
Related Mcqs:
- 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 - The power factor of an induction motor under no-load conditions will be closer to_____________?
A. 0.2 lagging
B. 0.2 leading
C. 0.5 leading
D. unity - 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 - In three-phase induction motors sometimes copper bars are placed deep in the rotor to___________?
A. improve starting torque
B. reduce copper losses
C. improve efficiency
D. improve power factor - 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 - Size of a high speed motor as compared to low speed motor for the same H.P. will be__________?
A. bigger
B. smaller
C. same
D. any of the above - Low voltage at motor terminals is due to____________?
A. inadequate motor wiring
B. poorely regulated power supply
C. any one of the above
D. none of the above - The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?
A. star connected only
B. delta connected only
C. A. and B. both
D. none of the above - 5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?
A. 730 r.p.m.
B. 960 r.p.m.
C. 1440 r.p.m.
D. 2880 r.p.m. - 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
