Home / Mechanical Engineering / Steam Nozzles and Turbines :: section-4

Mechanical Engineering :: Steam Nozzles and Turbines

  1. In cross compounding, the cylinders are arranged

  2. A.

     Side by side and each cylinder has common piston, connecting rod and crank

    B.

     Side by side and each cylinder has separate piston, connecting rod and crank

    C.

     At 90° and each cylinder has common piston, connecting rod and crank

    D.

     At 90° and each cylinder has separate piston, connecting rod and crank


  3. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

  4. A.

     Natural draught

    B.

     Induced draught

    C.

     Forced draught

    D.

     Balanced draught


  5. For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

  6. A.

     One-half the height of chimney

    B.

     Equal to the height of chimney

    C.

     Two times the height of chimney

    D.

     Four times the height of chimney


  7. The theoretical indicator diagram of a simple steam engine is based upon the assumption that

  8. A.

     There is no pressure drop due to condensation

    B.

     Steam is admitted at boiler pressure and exhausted at condenser pressure

    C.

     The expansion (or compression) of the steam is hyperbolic

    D.

     All of the above


  9. The clearance in the engine cylinder

  10. A.

     Increases the mean effective pressure

    B.

     Increases the workdone

    C.

     Decreases the efficiency of the engine

    D.

     All of these


  11. When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

  12. A.

     Slow speed engine

    B.

     Vertical steam engine

    C.

     Condensing steam engine

    D.

     Non-condensing steam engine


  13. Relative percentage of heat absorbed through the heat transfer of
    (i) Furnace water wall
    (ii) Boiler tank
    (iii) Superheater
    (iv) Economizer
    (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

  14. A.

     48 : 20 : 15 : 7 : 10

    B.

     10 : 7 : 15 : 20 : 48

    C.

     20 : 48 : 7 : 15 : 10

    D.

     7 : 15 : 20 : 10 : 48


  15. There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

  16. A.

     Wet steam

    B.

     Saturated steam

    C.

     Superheated steam

    D.

     Cushion steam


  17. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

  18. A.

     More heating surface

    B.

     Less heating surface

    C.

     Equal heating surface

    D.

     Heating surface depends on other parameters


  19. Locomotive type' boiler is

  20. A.

     Horizontal multi-tubular water tube boiler

    B.

     Water wall enclosed furnace type

    C.

     Vertical tubular fire tube type

    D.

     Horizontal multi-tubular fire tube type