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.Management Sciences
A. pulling the motor directly on line without a starter
B. locking of rotor due to harmonics
C. starting the motor on load which is more than the rated load
D. interchanging two supply phases for quick stopping
Related Mcqs:
- 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...
- The ‘crawling” in an induction motor is caused by___________?
- A. high loads B. low voltage supply C. improper design of machine D. harmonics developed in the motor...
- If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as____________?
- A. humming B. hunting C. crawling D. cogging...
- The shape of the torque/slip curve of induction motor is__________?
- A. parabola B. hyperbola C. rectangular parabola D. straigth line...
- When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?
- A. sR2X2 = 1 B. sR2 = X2 C. R2 = sX2 D. R2 = s2X2...
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