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Electrical Machine Design - section-1
  1. The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?

    2. A.

     Conduction
    B.

     Convection
    C.

     Radiation
    D.

     All of the above

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  2. The action of electromagnetic machines can be related to which of the following basic principles ?

    3. A.

     Induction
    B.

     Interaction
    C.

     Alignment
    D.

     All of the above

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  3. Which of the following properties a damping oil must possess ?

    4. A.

     Must be a good insulator
    B.

     Should be non-evaporating
    C.

     Should not have corrosive action upon the metal of the vane
    D.

     The viscosity of the oil should not change with the temperature
    E.

     All of the above

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  4. In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core

    5. A.

     5 percent
    B.

     10 percent
    C.

     15 percent
    D.

     30 percent
    E.

     none of the above

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  5. An induction meter can handle current up to

    6. A.

     10 A
    B.

     30 A
    C.

     60 A
    D.

     100 A

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  6. _______ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?

    7. A.

     Grey cast-iron
    B.

     Cast steel
    C.

     High carbon steel
    D.

     Stainless steel

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  7. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of

    8. A.

     0.1 Hz
    B.

     0.25 Hz
    C.

     0.5 Hz
    D.

     1.5 Hz

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  8. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto

    9. A.

     10 MW
    B.

     30 MW
    C.

     60 MW
    D.

     150 MW

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  9. The household energy meter is

    10. A.

     an indicating instrument
    B.

     a recording instrument
    C.

     an integrating instrument
    D.

     none of the above

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  10. The flash point of transformer oil should be higher than

    11. A.

     40°C
    B.

     60°C
    C.

     80°C
    D.

     104°C

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