A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting
Related Mcqs:
- 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 - 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 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 - need frequent starting and stopping of electric motors ?
A. Paper mills
B. Grinding mills
C. Air-conditioners
D. Lifts and hoists - 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 - _________________method of starting a three phase induction motor needs six terminals ?
A. Star-delta
B. Resistance starting
C. Auto-transformer
D. None of the above - Which of the following motors is preferred for traction work ?
A. Universal motor
B. D.C. series motor
C. Synchronous motor
D. Three-phase induction motor - Which of the following motors are pre-ferred for overhead travelling cranes ?
A. Slow speed motors
B. Continuous duty motors
C. Short time rated motors
D. None of the above - Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
E. Synchronous motor
D. D.C. motor - Which of the following motors is preferred for boom hoist of a travelling crane ?
A. Single phase motor
B. Synchronous motor
C. A.C. slip ring motor
D. Ward-Leonard controlled D.C. shunt motor
