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Mechanical Engineering :: Thermodynamics

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Thermodynamics - Section 7
Thermodynamics - section-8
  1. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

    2. A.

     A temperature of - 273.16°C
    B.

     A temperature of 0°C
    C.

     A temperature of 273 °K
    D.

     A negative pressure and 0°C temperature

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  2. Work done in a free expansion process is

    3. A.

     Zero
    B.

     Maximum
    C.

     Minimum
    D.

     Positive

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  3. Work-done in a free expansion process is

    4. A.

     Zero
    B.

     Minimum
    C.

     Maximum
    D.

     Positive

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  4. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

    5. A.

     0.086
    B.

     1.086
    C.

     1.086
    D.

     4.086

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  5. According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

    6. A.

     Temperature
    B.

     Absolute temperature, if volume is kept constant
    C.

     Volume, if temperature is kept constant
    D.

     None of these

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  6. The heat and mechanical energies are mutually convertible. This statement was established by

    7. A.

     Boyle
    B.

     Charles
    C.

     Joule
    D.

     None of these

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  7. Mond gas is obtained by

    8. A.

     Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
    B.

     Carbonisation of bituminous coal
    C.

     Passing steam over incandescent coke
    D.

     Passing air and a large amount of steam over waste coal at about 650°C

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  8. Producer gas is obtained by

    9. A.

     Carbonization of bituminous coal
    B.

     Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
    C.

     Passing steam over incandescent coke
    D.

     Passing air and a large amount of steam over waste coal at about 650°C

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  9. In open cycle gas turbine plants

    10. A.

     Direct combustion systems is used
    B.

     A condenser is used
    C.

     The indirect heat exchanger and cooler is avoided
    D.

     All of the above

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  10. The atomic mass of sulphur is

    11. A.

     12
    B.

     14
    C.

     16
    D.

     32

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