Which part of a motor needs maximum attention for maintenance ?

Related Mcqs:

1. _________________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...

2. ________________ motor is a constant speed motor?

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

3. 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...

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. For which of the following locomotives the maintenance requirements are the least ?

   A. Steam locomotives B. Diesel locomotives C. Electric locomotives D. Equal in all of the above...

6. 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...

7. Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?

   A. Starting characteristics B. Operating speed C. Horse power D. Speed control...

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...