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Mechanical Engineering :: Thermodynamics

  1. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is

  2. A.

     23.97 bar

    B.

     25 bar

    C.

     26.03 bar

    D.

     34.81 bar

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  3. Total heat of a substance is also known as

  4. A.

     Internal energy

    B.

     Entropy

    C.

     Thermal capacity

    D.

     Enthalpy

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  5. Otto cycle is also known as

  6. A.

     Constant pressure cycle

    B.

     Constant volume cycle

    C.

     Constant temperature cycle

    D.

     Constant temperature and pressure cycle

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  7. The entropy of water at 0°C is assumed to be

  8. A.

     0

    B.

     -1

    C.

     1

    D.

     2

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  9. According to kinetic theory of gases, the absolute zero temperature is attained when

  10. A.

     Volume of the gas is zero

    B.

     Pressure of the gas is zero

    C.

     Kinetic energy of the molecules is zero

    D.

     Specific heat of gas is zero

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  11. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from

  12. A.

     Zeroth low of thermodynamic

    B.

     First law of thermodynamics

    C.

     Second law to thermodynamics

    D.

     Basic law of thermodynamics

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  13. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

  14. A.

     Specific heat at constant volume

    B.

     Specific heat at constant pressure

    C.

     kilo-Joule

    D.

     None of these

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  15. In an isothermal process, the internal energy of gas molecules

  16. A.

     Increases

    B.

     Decreases

    C.

     Remain constant

    D.

     May increase/decrease depending on the properties of gas

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  17. The absolute zero pressure will be

  18. A.

     When molecular momentum of the system becomes zero

    B.

     At sea level

    C.

     At the temperature of - 273 K

    D.

     At the center of the earth

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  19. According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant

  20. A.

     Joule's law

    B.

     Boyle's law

    C.

     Gay Lussac’s law

    D.

     Charles' law

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