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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. The unit of power in S.I. units is kilowatt.

    2. A.

    True
    B.

    False

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  2. Otto cycle consists of

    3. A.

    two constant volume and two isentropic processes
    B.

    two constant pressure and two isentropic processes
    C.

    two constant volume and two isothermal processes
    D.

    one constant pressure, one constant volume and two isentropic processes

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  3. The increase in entropy of a system represents

    4. A.

    increase in availability of energy
    B.

    increase in temperature
    C.

    decrease in pressure
    D.

    degradation of energy

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  4. In a free expansion process,

    5. A.

    W1 - 2 = 0
    B.

    Q1 - 2 = 0
    C.

    dU = 0
    D.

    all of these

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  5. 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

    6. A.

    23.97 bar
    B.

    25 bar
    C.

    26.03 bar
    D.

    34.81 bar

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