A. resistance is inserted in the stator
B. reduced voltage is applied to the stator
C. resistance is inserted in the rotor
D. applied voltage perl stator phase is 57.7% of the line voltage
Related Mcqs:
- Insertion of resistance in the stator of an induction motor___________?
A. increases the load torque
B. decreases the starting torque
C. increases the starting torque
D. none of the above - It is advisable to avoid line-starting of induction motor and use starter because__________?
A. motor takes five to seven times its full load current
B. it will pick-up very high speed and may go out of step
C. it will run in reverse direction
D. starting torque is very high - It is advisable to avoid line starting of induction motor and use starter because____________?
A. it will run in reverse direction
B. it will pick up very high speed and may go out of step
C. motor takes five to seven times its full load current
D. starting torque is very high - Star-delta starting of motors is not possible in case of____________?
A. single phase motors
B. variable speed motors
C. low horse power motors
D. high speed motors - 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 - 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 - Reduced voltage starter can be used with_____________?
A. slip ring motor only but not with squirrel cage induction motor
B. squirrel cage induction motor only but not with slip ring motor
C. squirrel cage as well as slip ring induction motor
D. none of the above - An induction motor with 1000 r.p.m. speed will have____________?
A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles - 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 - Blocked rotor test on induction motors is used to find out?
A. leakage reactance
B. power factor on short circuit
C. short-circuit current under rated voltage
D. all of the above
