_________________method of starting a three phase induction motor needs six terminals ?

Related Mcqs:

1. 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...

2. 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...

3. 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...

4. 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...

5. 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...

6. 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...

7. 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...

8. Belted slip ring induction motor is almost invariably used for_________________?

   A. water pumps B. jaw crushers C. centrifugal blowers D. none of the above...

9. Which part of a motor needs maximum attention for maintenance ?

   A. Frame B. Rearing C. Stator winding D. Rotor winding...

10. ________________ motor is a constant speed motor?

    A. Synchronous motor B. Schrage motor C. Induction motor D. Universal motor...