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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

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  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

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  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

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  7. The value of cp/cv for air is

  8. A.

     1

    B.

     1.4

    C.

     1.45

    D.

     2.3

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  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

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  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

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  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

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  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

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  17. The specific heat of water is

  18. A.

     2.512

    B.

     1.817

    C.

     4.187

    D.

     None of these

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  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

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