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EEE :: Electrical Machine Design

  1. Murray loop test can be used for location of

  2. A.

     ground fault on a cable

    B.

     short circuit fault on a cable

    C.

     both the ground fault and the short-circuit fault

    D.

     none of the above


  3. The laminations of the armature of a D.C. machine are usually _____ thick.

  4. A.

     0.1 to 0.2 mm

    B.

     0.2 to 0.3 mm

    C.

     0.3 to 0.4 mm

    D.

     0.4 to 0.5 mm


  5. For measurement of inductance having high value, we should use

  6. A.

     Maxwell’s bridge

    B.

     Maxwell Wein bridge

    C.

     Hay’s bridge

    D.

     Any of the above


  7. D.C. servomotors are used in

  8. A.

     Purely D.C. control systems

    B.

     Purely AC. control systems

    C.

     Both D.C. and AC. control systems

    D.

     None of the above


  9. A power factor meter has

  10. A.

     one current circuit and two pressure circuits

    B.

     one current circuit and one pressure circuit

    C.

     two current circuits and one pres¬sure circuit

    D.

     none of the above


  11. Helical windings are used in

  12. A.

     distribution transformers

    B.

     power transformers

    C.

     shell type transformers

    D.

     none of the above


  13. Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling

  14. A.

     2 MVA

    B.

     5 MVA

    C.

     7.5 MVA

    D.

     10 MVA


  15. In a single phase power factor meter the phase difference between the currents in the two pressure coils is

  16. A.

     exactly 0°

    B.

     approximately 0°

    C.

     exactly 90°

    D.

     approximately 90°


  17. In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.

  18. A.

     2 to 3 times greater

    B.

     3 to 4 times greater

    C.

     4 to 5 times greater

    D.

     none of the above


  19. The power of a n-phase circuit can be measured by using a minimum of

  20. A.

     (n – 1) wattmeter elements

    B.

     n wattmeter elements

    C.

     (n + 1) wattmeter elements

    D.

     2n wattmeter elements