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Mechanical Engineering :: Thermodynamics

  1. A sudden fall in the barometer reading is a sign of approaching

  2. A.

     Fine weather

    B.

     Rains

    C.

     Storm

    D.

     Cold wave


  3. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly

  4. A.

     Temperature

    B.

     Enthalpy

    C.

     Internal energy

    D.

     Entropy


  5. A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

  6. A.

     -140 kJ

    B.

     -80 kJ

    C.

     -40 kJ

    D.

     +60 kJ


  7. One molecule of oxygen is __________ times heavier than the hydrogen atom.

  8. A.

     12

    B.

     14

    C.

     16

    D.

     32


  9. The oxygen atom is ________ times heavier than the hydrogen atom.

  10. A.

     2

    B.

     8

    C.

     16

    D.

     32


  11. Heat and work are

  12. A.

     Point functions

    B.

     System properties

    C.

     Path functions

    D.

     Intensive properties


  13. During throttling process

  14. A.

     Heat exchange does not take place

    B.

     No work is done by expanding steam

    C.

     There is no change of internal energy of steam

    D.

     All of the above


  15. Universal gas constant is defined as equal to product of the molecular weight of the gas and

  16. A.

     Specific heat at constant pressure

    B.

     Specific heat at constant volume

    C.

     Ratio of two specific heats

    D.

     Gas constant


  17. The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

  18. A.

     Flow is uniform and steady

    B.

     Process is isentropic

    C.

     Process is isothermal

    D.

     Process is isentropic and specific heat does not change with temperature


  19. The fuel mostly used in cement industry and in metallurgical processes is

  20. A.

     Wood charcoal

    B.

     Bituminous coke

    C.

     Pulverized coal

    D.

     Coke