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EEE :: Electrical Machine Design

  1. A Weston frequency meter is

  2. A.

     moving coil instrument

    B.

     moving iron instrument

    C.

     dynamometer instrument

    D.

     none of the above

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  3. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly

  4. A.

     deflecting

    B.

     controlling

    C.

     damping

    D.

     any of the above

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  5. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.

  6. A.

     increase

    B.

     decrease

    C.

     either of the above

    D.

     none of the above

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  7. For measurement of mutual inductance we can use

  8. A.

     Anderson bridge

    B.

     Maxwell’s bridge

    C.

     Heaviside bridge

    D.

     Any of the above

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  9. In a low power factor wattmeter the compensating coil is connected

  10. A.

     in series with current coil

    B.

     in parallel with current coil

    C.

     in series with pressure coil

    D.

     in parallel with pressure coil

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  11. Which of the following devices may be used for extending the range of instruments ?

  12. A.

     Shunts

    B.

     Multipliers

    C.

     Current transformers

    D.

     Potential transformers

    E.

     All of the above

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  13. The operating voltage of a meggar is about

  14. A.

     6 V

    B.

     12 V

    C.

     40 V

    D.

     100 V

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  15. Which of the following brushes can be used for high values of current density ?

  16. A.

     Metal graphite brushes

    B.

     Hard carbon brushes

    C.

     Electro-graphitic brushes

    D.

     Natural graphite brushes

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  17. Which of the following is an advantage of hydrogen cooling?

  18. A.

     Increase in efficiency

    B.

     Increase in ratings

    C.

     Increase in life

    D.

     All of the above

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  19. The insulation between windings and grounded core and the insulation between the windings of the same phase is

  20. A.

     minor insulation

    B.

     major insulation

    C.

     either of the above

    D.

     none of the above

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