17. The power input to the rotor of a 440-V, 50-Hz, 3-phase, 6-pole induction motor is 60 kW. It is observed that the rotor e.m.f. makes 90 complete cycles per minute. Calculate (a) the slip (b) rotor speed (c) rotor Cu loss per phase (c) the mechanical power developed and (e) the rotor resistance per phase if rotor current is 60 A. [ (a) 0.03 (b) 970 r.p.m. (c) 600 W (d) 58.2 kW (e) 0.1670]
17. The power input to the rotor of a 440-V, 50-Hz, 3-phase, 6-pole induction motor is 60 kW. It is observed that the rotor e.m.f. makes 90 complete cycles per minute. Calculate (a) the slip (b) rotor speed (c) rotor Cu loss per phase (c) the mechanical power developed and (e) the rotor resistance per phase if rotor current is 60 A. [ (a) 0.03 (b) 970 r.p.m. (c) 600 W (d) 58.2 kW (e) 0.1670]
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![17. The power input to the rotor of a 440-V, 50-Hz, 3-phase, 6-pole induction motor is 60 kW. It is
observed that the rotor e.m.f. makes 90 complete cycles per minute. Calculate (a) the slip (b) rotor
speed (c) rotor Cu loss per phase (c) the mechanical power developed and (e) the rotor resistance per
phase if rotor current is 60 A.
18. An induction motor is running at 50% of the synchronous speed with a useful output of 41.03 kW
[ (a) 0.03 (b) 970 r.p.m. (c) 600 W (d) 58.2 kW (e) 0.167 Q]
and the mechanical losses total 1.492 kW. Estimate the Cu loss in the rotor circuit of the motor. If the
stator losses total 3.5 kW, at what efficiency is the motor working ?
[42.52 kW; 46.34%] (Electrical Engineering-II, Bombay Univ. 1975)
19. Plot the torque/speed curve of a 6-pole, 50-Hz, 3-phase induction motor. The rotor resistance and
reactance per phase are 0.02 2 and 0.1 2 respectively. At what speed is the torque a maximum?
What must be the value of the external rotor resistance per phase to give two-third of maximum](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F58ea38e7-a7d0-4144-a57d-0ddeccbbda12%2F73a55e32-3487-48d6-8355-347e0bd12e16%2Fso1r1lx_processed.jpeg&w=3840&q=75)
Transcribed Image Text:17. The power input to the rotor of a 440-V, 50-Hz, 3-phase, 6-pole induction motor is 60 kW. It is
observed that the rotor e.m.f. makes 90 complete cycles per minute. Calculate (a) the slip (b) rotor
speed (c) rotor Cu loss per phase (c) the mechanical power developed and (e) the rotor resistance per
phase if rotor current is 60 A.
18. An induction motor is running at 50% of the synchronous speed with a useful output of 41.03 kW
[ (a) 0.03 (b) 970 r.p.m. (c) 600 W (d) 58.2 kW (e) 0.167 Q]
and the mechanical losses total 1.492 kW. Estimate the Cu loss in the rotor circuit of the motor. If the
stator losses total 3.5 kW, at what efficiency is the motor working ?
[42.52 kW; 46.34%] (Electrical Engineering-II, Bombay Univ. 1975)
19. Plot the torque/speed curve of a 6-pole, 50-Hz, 3-phase induction motor. The rotor resistance and
reactance per phase are 0.02 2 and 0.1 2 respectively. At what speed is the torque a maximum?
What must be the value of the external rotor resistance per phase to give two-third of maximum
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