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EEE :: Electrical Machine Design

  1. In a Schering bridge the potential of the detector above earth potential is

  2. A.

     a few volts only

    B.

     1 kV

    C.

     5 kV

    D.

     10 kV


  3. Induction type single phase energy meters measure electric energy in

  4. A.

     kW

    B.

     Wh

    C.

     kWh

    D.

     VAR

    E.

     None of the above


  5. To measure radio frequency, the suitable frequency meter is

  6. A.

     Weston frequency meter

    B.

     reed vibrator frequency meter

    C.

     heterodoxy frequency meter

    D.

     electrical resonance frequency meter


  7. The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.

  8. A.

     minimum

    B.

     maximum

    C.

     nil

    D.

     none of the above


  9. Power transformers should be designed to have maximum efficiency

  10. A.

     at one-fourth load

    B.

     at one-half load

    C.

     at or near full load

    D.

     any of the above


  11. are used for construction of core of electromagnets.

  12. A.

     Soft magnetic materials

    B.

     Hard magnetic materials

    C.

     Either (A) or (B)

    D.

     None of the above


  13. For measurements on high voltage capacitors, the suitable bridge is

  14. A.

     Wein bridge

    B.

     Schering bridge

    C.

     Any of the above

    D.

     None of the above


  15. A moving-coil permanent-magnet instrument can be used as flux meter

  16. A.

     by using a low resistance shunt

    B.

     by using a high series resistance

    C.

     by eliminating the control springs

    D.

     by making control springs of large moment of inertia


  17. In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.

  18. A.

     small

    B.

     medium

    C.

     large

    D.

     any of the above


  19. is usually used for brush rockers

  20. A.

     Mild steel

    B.

     Copper

    C.

     Aluminium

    D.

     Cast-iron