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EEE :: Electrical Machine Design

  1. Operating torques in analogue instruments are

  2. A.

     deflecting and control

    B.

     deflecting and damping

    C.

     deflecting, control and damping

    D.

     vibration and balancing


  3. The principle on which vector voltmeter is based is

  4. A.

     that it works on the principle of complex variation

    B.

     that it measures the response of linear ramp voltage

    C.

     same as digital meter

    D.

     that it measures the amplitude of a single at two points and at the same time measures their phase difference


  5. Which of the following is the major consideration to evolve a good design ?

  6. A.

     Cost

    B.

     Durability

    C.

     Compliance with performance criteria as laid down in specifications

    D.

     All of the above


  7. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

  8. A.

     single-phase winding

    B.

     two-phase winding

    C.

     three-phase winding

    D.

     any of the above


  9. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

  10. A.

     Increased I R losses

    B.

     Increased core losses

    C.

     Poor commutation

    D.

     Change in motor parameters

    E.

     All of the above


  11. The cylindrical windings using circular conductors are used for current rating of

  12. A.

     upto 20 A

    B.

     upto 40 A

    C.

     upto 60 A

    D.

     upto 80 A


  13. The forced oil and air circulation method is usual one for transformers of capacities

  14. A.

     upto 5 MVA

    B.

     upto 10 MVA

    C.

     upto 20 MVA

    D.

     30 MVA upwards


  15. In an energy meter braking torque is produced to

  16. A.

     safe guard it against creep

    B.

     brake the instrument

    C.

     bring energy meter to stand still

    D.

     maintain steady speed and equal to driving torque


  17. In a portable instrument, the controlling torque is provided by

  18. A.

     spring

    B.

     gravity

    C.

     eddy currents

    D.

     all of the above


  19. In a meggar controlling torque is provided by

  20. A.

     spring

    B.

     gravity

    C.

     coil

    D.

     eddy current