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Mechanical Engineering :: Thermodynamics

  1. One Joule (J) is equal to

  2. A.

     1 kN-m

    B.

     1 N-m

    C.

     10 kN-m/s

    D.

     10 N-m/s


  3. Reversed joule cycle is called

  4. A.

     Carnot cycle

    B.

     Rankine cycle

    C.

     Brayton cycle

    D.

     Bell Coleman cycle


  5. The entropy __________ in an irreversible cyclic process.

  6. A.

     Remains constant

    B.

     Decreases

    C.

     Increases

    D.

     None of these


  7. The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to

  8. A.

     E/3

    B.

     E/2

    C.

     3E/4

    D.

     2E/3


  9. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

  10. A.

     Cut-off is decreased

    B.

     Cut-off is constant

    C.

     Cut-off is increased

    D.

     Cut-off is zero


  11. The heat energy stored in the gas and used for raising the temperature of the gas is known as

  12. A.

     External energy

    B.

     Internal energy

    C.

     Kinetic energy

    D.

     Molecular energy


  13. According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

  14. A.

     Remains constant

    B.

     Increases

    C.

     Decreases

    D.

     None of these


  15. In an isothermal process, the internal energy

  16. A.

     Increases

    B.

     Decreases

    C.

     Remain constant

    D.

     First increases and then decreases


  17. Calorie is a measure of

  18. A.

     Specific heat

    B.

     Quantity of heat

    C.

     Thermal capacity

    D.

     Entropy


  19. Kerosene is distilled at

  20. A.

     65° to 220°C

    B.

     220° to 345°C

    C.

     345° to 470°C

    D.

     470° to 550°C