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Electrical Machine Design - section-1
  1. The slot leakage can be calculated by making which of the following assumptions ?

    2. A.

     The current in the slot conductors is uniformly distributed over their cross-section
    B.

     The leakage path is straight across the slot and around the iron at the bottom
    C.

     The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
    D.

     All of the above

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  2. The stator of a D.C. machine comprises of

    3. A.

     main poles
    B.

     interpoles
    C.

     frame
    D.

     all of the above

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  3. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as

    4. A.

     small size machines
    B.

     medium size machines
    C.

     large size machines
    D.

     any of the above

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  4. In an Anderson bridge, the unknown inductance is measured in terms of

    5. A.

     known inductance and resistance
    B.

     known capacitance and resistance
    C.

     known resistance
    D.

     known inductance

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  5. The desirable static characteristics of a measuring system are

    6. A.

     accuracy and reproducibility
    B.

     accuracy, sensitivity and reproducibility
    C.

     drift and dead zone
    D.

     static error

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  6. A moving iron instrument can be used for

    7. A.

     D.C. only
    B.

     A.C. only
    C.

     both D.C. and A.C.
    D.

     neither D.C. and A.C.

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  7. Machines cooled by direct cooling method may be called

    8. A.

     supercharged
    B.

     inner cooled
    C.

     conductor cooled
    D.

     any of the above

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  8. In D.C. machines the usual limit of slot pitch is

    9. A.

     between 5 to 10 mm
    B.

     between 10 to 15 mm
    C.

     between 15 to 20 mm
    D.

     between 25 to 35 mm

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  9. In majority of instruments damping is provided by

    10. A.

     fluid friction
    B.

     spring
    C.

     eddy currents
    D.

     all of the above

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  10. _______ instruments are those which measure the total quantity of electricity delivered in a particular time.

    11. A.

     Absolute
    B.

     Indicating
    C.

     Recording
    D.

     Integrating

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