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Mechanical Engineering :: Thermodynamics

  1. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant

  2. A.

     Pressure

    B.

     Temperature

    C.

     Volume

    D.

     Internal energy


  3. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

  4. A.

     Pressure

    B.

     Temperature

    C.

     Volume

    D.

     Internal energy


  5. A definite area or a space where some thermodynamic process takes place is known as

  6. A.

     Thermodynamic system

    B.

     Thermodynamic cycle

    C.

     Thermodynamic process

    D.

     Thermodynamic law


  7. The work ratio of a gas turbine plant is given by

  8. A.

     (Net work output)/(Work-done by the turbine)

    B.

     (Net work output)/(Heat supplied)

    C.

     (Actual temperature drop)/(Isentropic temperature drop)

    D.

     (Isentropic increase in temperature)/(Actual increase in temperature)


  9. The mass of excess air supplied is equal to

  10. A.

     (23/100) × Mass of excess carbon

    B.

     (23/100) × Mass of excess oxygen

    C.

     (100/23) × Mass of excess carbon

    D.

     (100/23) × Mass of excess oxygen


  11. An ideal gas as compared to a real gas at very high pressure occupies

  12. A.

     More volume

    B.

     Less volume

    C.

     Same volume

    D.

     Unpredictable behavior


  13. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

  14. A.

     Cracking

    B.

     Fractional distillation

    C.

     Full distillation

    D.

     Carbonisation


  15. If the value of n = 0 in the equation pvn = C, then the process is called

  16. A.

     Constant volume process

    B.

     Adiabatic process

    C.

     Constant pressure process

    D.

     Isothermal process


  17. If in the equation pvn = C, the value of n = ∝, then the process is called

  18. A.

     Constant volume process

    B.

     Adiabatic process

    C.

     Constant pressure process

    D.

     Isothermal process


  19. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

  20. A.

     Free expansion

    B.

     Hyperbolic expansion

    C.

     Adiabatic expansion

    D.

     Parabolic expansion