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EEE :: Electrical Machine Design

  1. The switch board instruments

  2. A.

     should be mounted in vertical position

    B.

     should be mounted in horizontal position

    C.

     either (A) or (B)

    D.

     neither (A) nor (B)

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  3. The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?

  4. A.

     Corrugations

    B.

     Fins

    C.

     Tubes

    D.

     All of the above

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  5. The distance between the starts of two consecutive coils measured in terms of coil sides is called

  6. A.

     front pitch

    B.

     winding pitch

    C.

     commutator pitch

    D.

     back pitch

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  7. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was

  8. A.

     unity

    B.

     0.8 lagging

    C.

     0.8 leading

    D.

     zero

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  9. E.m.f. of a Weston cell is accurately measured by

  10. A.

     electrostatic voltmeter

    B.

     hot wire voltmeter

    C.

     isothermal voltmeter

    D.

     electrodynamic voltmeter

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  11. D.C. windings are

  12. A.

     sometimes 2-layer type

    B.

     never 2-layer type

    C.

     always 2-layer type

    D.

     none of the above

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  13. The design of electromagnets is based upon which of the following fundamental equations ?

  14. A.

     Force equation

    B.

     Magnetic circuit equation

    C.

     Heating equation

    D.

     Voltage equation

    E.

     All of the above

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  15. The disc of an instrument using eddy current damping should be of

  16. A.

     conducting and magnetic material

    B.

     non-conducting and magnetic material

    C.

     conducting and non-magnetic material

    D.

     none of the above

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  17. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?

  18. A.

     1.0 Wb/m²

    B.

     1.1 Wb/m²

    C.

     1.3 Wb/m²

    D.

     1.6 Wb/m²

    E.

     None of the above

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  19. ________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall

  20. A.

     Direct

    B.

     Indirect

    C.

     Conventional

    D.

     Any of the above

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