In squirrel cage induction motors which of the following methods of starting cannot be used ?

Related Mcqs:

1. 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...

2. 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...

3. 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...

4. need frequent starting and stopping of electric motors ?

   A. Paper mills B. Grinding mills C. Air-conditioners D. Lifts and hoists...

5. 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...

6. _________________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...

7. 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...

8. 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...

9. 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...

10. 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...