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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The expansion of steam, as it flows over the blades in reaction turbine, represents

  2. A.

     Isothermal process

    B.

     Isentropic process

    C.

     Throttling process

    D.

     Free expansion process


  3. Multi-stage steam turbines are of the

  4. A.

     Velocity compounded type

    B.

     Reaction type

    C.

     Pressure compounded type

    D.

     All of these


  5. The difference between Cornish boiler and Lancashire boiler is that

  6. A.

     Former is fire tube type and latter is water tube type boiler

    B.

     Former is water tube type and latter is fire tube type

    C.

     Former contains one fire tube and latter contains two fire tubes

    D.

     None of the above


  7. Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that

  8. A.

     former is fire tube type and latter is water tube type boiler

    B.

     former is water tube type and latter is fire tube type

    C.

     former contains one fire tube and latter contains two fire tubes

    D.

     none of the above


  9. Water tube boilers are those in which

  10. A.

     Flue gases pass through tubes and water around it

    B.

     Water passes through the tubes and flue gases around it

    C.

     Work is done during adiabatic expansion

    D.

     Change in enthalpy


  11. Fire tube boilers are those in which

  12. A.

     Flue gases pass through tubes and water around it

    B.

     Water passes through the tubes and flue gases around it

    C.

     Forced circulation takes place

    D.

     Tubes are laid vertically


  13. Parson's reaction turbine is a __________ reaction turbine.

  14. A.

     40 percent

    B.

     50 percent

    C.

     60 percent

    D.

     70 percent


  15. The increase in pressure

  16. A.

     Lowers the boiling point of a liquid

    B.

     Raises the boiling point of a liquid

    C.

     Does not affects the boiling point of a liquid

    D.

     Reduces its volume


  17. The latent heat of steam with increase of pressure

  18. A.

     Remain same

    B.

     Increases

    C.

     Decreases

    D.

     Behaves unpredictably


  19. In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

  20. A.

     Equal to

    B.

     Less than

    C.

     More than

    D.

     None of these