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Mechanical Engineering :: Thermodynamics

  1. The heating of a gas at constant pressure is governed by

  2. A.

     Boyle's law

    B.

     Charles' law

    C.

     Gay-Lussac law

    D.

     Avogadro's law

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  3. One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

  4. A.

     800 K

    B.

     1000 K

    C.

     1200 K

    D.

     1400 K

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  5. Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

  6. A.

     1/27th

    B.

     1/93th

    C.

     1/173th

    D.

     1/273th

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  7. When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

  8. A.

     Coke

    B.

     Wood charcoal

    C.

     Bituminous coal

    D.

     Briquetted coal

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  9. Which of the following cycles is not a reversible cycle?

  10. A.

     Carnot

    B.

     Ericsson

    C.

     Stirling

    D.

     None of the above

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  11. Which of the following is an irreversible cycle?

  12. A.

     Carnot

    B.

     Stirling

    C.

     Ericsson

    D.

     None of the above

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  13. In an extensive property of a thermodynamic system

  14. A.

     Extensive heat is transferred

    B.

     Extensive work is done

    C.

     Extensive energy is utilized

    D.

     None of these

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  15. The more effective way of increasing efficiency of Carnot engine is to

  16. A.

     Increase higher temperature

    B.

     Decrease higher temperature

    C.

     Increase lower temperature

    D.

     Decrease lower temperature

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  17. The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

  18. A.

     Heat absorbed

    B.

     Heat rejected

    C.

     Either heat absorbed or heat rejected

    D.

     None of these

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  19. The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents

  20. A.

     Heat absorbed

    B.

     Heat rejected

    C.

     Either (A) or (B)

    D.

     None of these

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