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Mechanical Engineering :: Steam Nozzles and Turbines

  1. In a reaction turbine, when steam flows through the moving blades,

  2. A.

     Pressure increases while velocity decreases

    B.

     Pressure decreases while velocity increases

    C.

     Pressure and velocity both decreases

    D.

     Pressure and velocity both increases


  3. In water wall furnace, the heat is transferred to the water walls by

  4. A.

     Convection

    B.

     Radiation

    C.

     Conduction

    D.

     Radiation and conduction


  5. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

  6. A.

     Less

    B.

     More

    C.

     Equal

    D.

     May be less or more depending on temperature


  7. 100% efficiency of a thermal cycle cannot be achieved because of

  8. A.

     Frictional losses

    B.

     It is not possible to achieve 0°K temperature

    C.

     Leakage

    D.

     Non availability of ideal substance


  9. Lancashire boiler is of

  10. A.

     Stationary < fire tube type

    B.

     Horizontal type

    C.

     Natural circulation type

    D.

     All of the above


  11. The major axis of elliptical manholes on the shell should be provided

  12. A.

     Longitudinally

    B.

     Circumferentially

    C.

     On dished end

    D.

     Anywhere


  13. In a throttling process

  14. A.

     Steam temperature remains constant

    B.

     Steam pressure remains constant

    C.

     Steam enthalpy remains constant

    D.

     Steam entropy remains constant


  15. The object of producing draught in a boiler is

  16. A.

     To provide an adequate supply of air for the fuel combustion

    B.

     To exhaust the gases of combustion from the combustion chamber

    C.

     To discharge the gases of combustion to the atmosphere through the chimney

    D.

     All of the above


  17. The artificial draught is produced by

  18. A.

     Steam jet

    B.

     Centrifugal fan

    C.

     Chimney

    D.

     Both (A) and (B)


  19. The natural draught is produced by

  20. A.

     Steam jet

    B.

     Centrifugal fan

    C.

     Chimney

    D.

     Both (A) and (B)