A. Star-delta
B. Resistance starting
C. Auto-transformer
D. None of the above
Related Mcqs:
- In ________________ method of staging three phase induction motors the starting voltage is not reduced?
A. auto-transformer
B. star-delta
C. slip ring
D. any of the above - A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
A. slop speed operation
B. high starting torque
C. low windage losses
D. all of the above - For three-phase induction motors which of the following is the least efficient method of speed control ?
A. Cascade control
B. Pole changing
C. Rheostat control
D. Combination of cascade and pole changing - In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting - The starting torque of a D.C. motor is independent of which of the following?
A. Flux
B. Armature current
C. Flux and armature current
D. Speed - A pony motor is used for the starting which of the following motors ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above - The cost of an induction motor will increase as________________?
A. horsepower rating increases but r.p.m. decreases
B. horsepower rating decreases but r.p.m. increases
C. horsepower rating and operating speed increases
D. horsepower rating and operating speed decreases - Belted slip ring induction motor is almost invariably used for_________________?
A. water pumps
B. jaw crushers
C. centrifugal blowers
D. none of the above - Which part of a motor needs maximum attention for maintenance ?
A. Frame
B. Rearing
C. Stator winding
D. Rotor winding - ________________ motor is a constant speed motor?
A. Synchronous motor
B. Schrage motor
C. Induction motor
D. Universal motor
