________________ motor is a constant speed motor?

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 a paper mill where constant speed is required________________?

   A. synchronous motors are preferred B. A.C. motors are preferred C. individual drive is preferred D. group drive is preferred...

3. Besides a constant speed a synchronous rotor possesses which of the following advantages ?

   A. Lower cost B. Better efficiency C. High power factor D. All of the above...

4. When the motor is at its maximum speed then back emf will be______________?

   A. Maximum B. Zero C. Intermediate values D. No back emf...

5. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

   A. 150msec-1 B. 384msec-1 C. 38.4msec-1 D. 200msec-1...

6. Reluctance motor is a________________?

   A. variable torque motor B. low torque variable speed motor C. self starting type synchronous motor D. low noise, slow speed motor...

7. Rotor of a motor is usually supported on ___________________ bearings?

   A. ball or roller B. needle C. bush D. thrust...

8. 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...

9. The diameter of the rotor shaft for an electric motor depends on which of the following ?

   A. r.p.m. only B. Horse power only C. Horse power and r.p.m. D. Horse power, r.p.m. and power factor...

10. While selecting motor for an air conditioner which of the following characteristics is of great importance ?

    A. Type of bearings B. Type of enclosure C. Noise D. Arrangement for power transmis¬sion E. None of the above...