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Mechanical Engineering :: Thermodynamics

Thermodynamics - Section 1
Thermodynamics - Section 2
Thermodynamics - Section 3
Thermodynamics - Section 4
Thermodynamics - Section 5
Thermodynamics - Section 6
Thermodynamics - Section 7
Thermodynamics - section-8

  1. An open system is one in which

    2. A.

    heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
    B.

    mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
    C.

    both the heat and work as well as mass of the working substance crosses the boundary of the system
    D.

    neither the heat and work nor the mass of the working substance crosses the boundary of the system

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  2. 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 to800K

    3. A.

    800K
    B.

    1000K
    C.

    1200K
    D.

    1400K

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  3. The efficiency of a gas turbine is given by

    4. A.

    \(\frac { Net work output } { Workdone by the turbine }\)
    B.

    \(\frac { Net work output } { Heat supplied }\)
    C.

    \(\frac { Actual temperature drop } { Isentropic temperature drop }\)
    D.

    \(\frac {Isentropic increase intemperature} { Actual increase in temperature} \)

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  4. When the gas is heated at constant volume, the heat supplied

    5. A.

    increases the internal energy of the gas and increases the temperature of the gas
    B.

    does some external work during expansion
    C.

    Both (A) and (B)
    D.

    None of these

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  5. In closed cycle gas turbine, the air is compressed

    6. A.

    isothermally
    B.

    isentropically
    C.

    polytropically
    D.

    none of these

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