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Mechanical Engineering :: Thermodynamics

  1. Which of the following has the highest calorific value?

  2. A.

     Anthracite coal

    B.

     Bituminous coal

    C.

     Peat

    D.

     Lignite


  3. Which of the following gas has the highest calorific value?

  4. A.

     Coal gas

    B.

     Producer gas

    C.

     Mond gas

    D.

     Blast furnace gas


  5. Carbonization of coal consists of

  6. A.

     Drying and crushing the coal to a fine powder

    B.

     Moulding the finely ground coal under pressure with or without a binding material

    C.

     Heating the wood with a limited supply of air to temperature not less than 280°C

    D.

     None of the above


  7. The value of cp/cv for air is

  8. A.

     1

    B.

     1.4

    C.

     1.45

    D.

     2.3


  9. When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency

  10. A.

     1/4

    B.

     Zero

    C.

     1/5

    D.

     2


  11. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

  12. A.

     Irreversible cycle

    B.

     Thermodynamic cycle

    C.

     Reversible cycle

    D.

     None of these


  13. The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

  14. A.

     Element

    B.

     Compound

    C.

     Atom

    D.

     Molecule


  15. The amount of heat generated per kg of fuel is known as

  16. A.

     Calorific value

    B.

     Heat energy

    C.

     Lower calorific value

    D.

     Higher calorific value


  17. The specific heat of water is

  18. A.

     2.512

    B.

     1.817

    C.

     4.187

    D.

     None of these


  19. Change in enthalpy of a system is the heat supplied at

  20. A.

     Constant pressure

    B.

     Constant temperature

    C.

     Constant volume

    D.

     Constant entropy