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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. Liquid fuels have lower efficiency than solid fuels.

    2. A.

    True
    B.

    False

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  2. The heat absorbed during a polytropic process is

    3. A.

    \(\frac { Y - n } { Y - 1}\)x Workdone
    B.

    \(\frac { Y - n } { Y - 1} \times \frac{\rho_1v_1 - \rho_2v_2}{(n-1)}\) 
    C.

    \(\frac { Y - n } { Y - 1} \times \frac{m R (T_1 -T_2)}{(n-1)}\)
    D.

    all of these

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  3. Liquid fuels consist of hydrocarbons.

    4. A.

    True
    B.

    False

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  4. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

    5. A.

    \(\frac { v_1 } { v_2 }\)
    B.

    \(\frac { v_2 } { v_1 } \)
    C.

    \(\frac { v_1 + v_2 } {v_1}\)
    D.

    \(\frac { v_1 + v_2 } {v_2}\)

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  5. The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

    6. A.

    Agree
    B.

    Disagree

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