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Mechanical Engineering :: Steam Nozzles and Turbines

  1. Cut-off ratio is the ratio of

  2. A.

     Swept volume to the volume at cut-off

    B.

     Volume at cut-off to the clearance volume

    C.

     Volume at cut-off to the swept volume

    D.

     Clearance volume to the volume at cut-off


  3. The fire tubes in a Cochran boiler are

  4. A.

     Horizontal

    B.

     Vertical

    C.

     Inclined

    D.

     None of these


  5. The numbers of fire tubes in a Cochran boiler are

  6. A.

     75

    B.

     115

    C.

     165

    D.

     225


  7. The three "Ts" for good combustion are

  8. A.

     Temperature, time, and turbulence

    B.

     Total air, true fuel, and turbulence

    C.

     Thorough mixing, total air and temperature

    D.

     Total air, time, and temperature


  9. The function of a valve rod is

  10. A.

     To provide reciprocating motion to the slide valve

    B.

     To convert reciprocating motion of the piston into rotary motion of the crank

    C.

     To convert rotary motion of the crankshaft into to and fro motion of the valve rod

    D.

     To provide simple harmonic motion to the D-slide valve


  11. In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

  12. A.

     Velocity increases

    B.

     Velocity decreases

    C.

     Velocity remains constant

    D.

     Pressure remains constant


  13. Equivalent evaporation is the amount of water evaporated in a boiler from and at

  14. A.

     0°C

    B.

     100°C

    C.

     Saturation temperature at given pressure

    D.

     Room temperature


  15. When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

  16. A.

     Internally fired boiler

    B.

     Externally fired boiler

    C.

     Natural circulation boiler

    D.

     Forced circulation boiler


  17. When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

  18. A.

     Internally fired boiler

    B.

     Externally fired boiler

    C.

     Natural circulation boiler

    D.

     Forced circulation boiler


  19. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

  20. A.

     Regenerative heating

    B.

     Reheating of steam

    C.

     Bleeding

    D.

     None of these