Category: Polyphase Induction Motors

A. less than 1%
B. 1.5%
C. 2%
D. 4%

A. stator resistance test
B. no-load test only
C. short-circuit test only
D. noue of the above

A. copper
B. carbon
C. phospor bronze
D. aluminium

A. slip ring induction motor
B. squirrel cage induction motor
C. both A. and (b)
D. none of the above

A. 60 to 90%
B. 80 to 90%
C. 95 to 98%
D. 99%

A. Bearings
B. Shaft
C. Statorcore
D. None of the above

A. initial cost is the main consideration
B. maintenance cost is to be kept low
C. higher starting torque is the main consideration
D. all above considerations are involved

A. e.m.f. injection in rotor eueuit
B. Changing the number of poles
C. Cascade operation
D. None of the above

A. Air motor
B. Induction motor
C. D.C. shunt motor
D. Synchronous motor

A. magnetic field and rotor rotate in opposite direction
B. rotor speed is less than the synchronous speed of the field and are in the same direction
C. rotor speed is more than the synchronous speed of the field and are in the same direction
D. none of the above