A. speed control is required
B. frequent starting, stopping and reversing is required
C. high starting torque is needed
D. all above features are required
Related Mcqs:
- 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 - A 3-phase slip ring motor has____________?
A. double cage rotor
B. wound rotor
C. short-circuited rotor
D. any of the above - 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 - In an induction motor, no-load the slip is generally____________?
A. less than 1%
B. 1.5%
C. 2%
D. 4% - A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?
A. 200 Hz
B. 50 Hz
C. 2 Hz
D. 0.2 Hz - The number of slip rings on a squirrel cage induction motor is usually____________?
A. two
B. three
C. four
D. none - In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?
A. Ns
B. s.N,
C. (l-s)Ns
D. (Ns-l)s - The shape of the torque/slip curve of induction motor is__________?
A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line - 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 - In induction motor, percentage slip depends on__________?
A. supply frequency
B. supply voltage
C. copper losses in motor
D. none of the above
