A. Bearings
B. Shaft
C. Statorcore
D. None of the above
Related Mcqs:
- The frame of an induction motor is usually made of____________?
A. silicon steel
B. cast iron
C. aluminium
D. bronze - In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?
A. reduce windage losses
B. reduce eddy currents
C. reduce accumulation of dirt and dust
D. reduce magnetic hum - Slip rings are usually made of___________?
A. copper
B. carbon
C. phospor bronze
D. aluminium - DOL starting of induction motors is usually restricted to_____________?
A. low horsepower motors
B. variable speed motors
C. high horsepower motors
D. high speed motors - In the squirrel-cage induction motor the rotor slots are usually given slight skew__________?
A. to reduce the magnetic hum and locking tendency of the rotor
B. to increase the tensile strength of the rotor bars
C. to ensure easy fabrication
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 - Stepless speed control of induction motor is possible by which of the following methods ?
A. e.m.f. injection in rotor eueuit
B. Changing the number of poles
C. Cascade operation
D. None of the above - The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?
A. D.C. series motor
B. D.C. shunt motor
C. universal motor
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. - Which is of the following data is required to draw the circle diagram for an induction motor ?
A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test
