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Mechanical Engineering :: Thermodynamics

  1. When a gas is heated at constant volume

  2. A.

     Its temperature will increase

    B.

     Its pressure will increase

    C.

     Both temperature and pressure will increase

    D.

     Neither temperature nor pressure will increase


  3. In a reversible adiabatic process, the ratio of T1/T2 is equal to

  4. A.

     (p2/p1)γ - 1/ γ

    B.

     (p1/p2)γ - 1/ γ

    C.

     (v2/v1)γ - 1/ γ

    D.

     (v1/v2)γ - 1/ γ


  5. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

  6. A.

     Less than

    B.

     Equal to

    C.

     More than

    D.

     None of these


  7. The processes occurring in open system which permit the transfer of mass to and from the system, are known as

  8. A.

     Flow processes

    B.

     Non-flow processes

    C.

     Adiabatic processes

    D.

     None of these


  9. Which of the following is not the intensive property?

  10. A.

     Pressure

    B.

     Temperature

    C.

     Density

    D.

     Heat


  11. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

  12. A.

     Divided by its molecular weight

    B.

     Multiplied by its molecular weight

    C.

     Multiplied by its density

    D.

     Multiplied by its specific weight


  13. When the gas is heated at constant pressure, the heat supplied

  14. A.

     Increases the internal energy of the gas

    B.

     Increases the temperature of the gas

    C.

     Does some external work during expansion

    D.

     Both (B) and (C)


  15. When the gas is heated at constant volume, the heat supplied

  16. A.

     Increases the internal energy of the gas and increases the temperature of the gas

    B.

     Does some external work during expansion

    C.

     Both (A) and (B)

    D.

     None of these


  17. Kinetic theory of gases assumes that the collisions between the molecules are

  18. A.

     Perfectly elastic

    B.

     Perfectly inelastic

    C.

     Partly elastic

    D.

     Partly inelastic


  19. The ultimate analysis of coal consists of the determination of the percentage of

  20. A.

     Carbon

    B.

     Hydrogen and nitrogen

    C.

     Sulphur and ash

    D.

     All of these