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EEE :: Electrical Machine Design

  1. If an insulating material is operated beyond the maximum allowable temperature, its life is

  2. A.

     drastically increased

    B.

     drastically reduced

    C.

     unaffected

    D.

     none of the above

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  3. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?

  4. A.

     Copper

    B.

     Aluminium

    C.

     Steel

    D.

     Cast-iron

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  5. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to

  6. A.

     improve its ventilation

    B.

     eliminate creeping at no load

    C.

     increase its deflecting torque

    D.

     increase its braking torque

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  7. Standard resistor is made from

  8. A.

     platinum

    B.

     maganin

    C.

     silver

    D.

     nichrome

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  9. A dynamometer wattmeter can be used for

  10. A.

     both D.C. and A.C.

    B.

     D.C. only

    C.

     A.C. only

    D.

     any of the above

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  11. An induction wattmeter can be used for

  12. A.

     both D.C. and A.C.

    B.

     D.C. only

    C.

     A.C. only

    D.

     any of the above

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  13. Basically a potentiometer is a device for

  14. A.

     comparing two voltages

    B.

     measuring a current

    C.

     comparing two currents

    D.

     measuring a voltage

    E.

     none of the above

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  15. A potentiometer may be used for

  16. A.

     measurement of resistance

    B.

     measurement of current

    C.

     calibration of ammeter

    D.

     calibration of voltmeter

    E.

     all of the above

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  17. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of

  18. A.

     short pitch

    B.

     full pitch

    C.

     either of the above

    D.

     none of the above

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  19. Which of the following methods may be adopted to reduce the effects of armature reaction?

  20. A.

     Increase in length of air gap at pole tips

    B.

     Increasing reluctance of pole tips

    C.

     Compensating windings

    D.

     All of the above

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