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Mechanical Engineering :: Thermodynamics

  1. To ensure complete and rapid combustion of a fuel, some quantity of air, in excess of the theoretical or minimum air is supplied.

  2. A.

    Yes

    B.

    No


  3. According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) __________ with the change in pressure and temperature of the gas.

  4. A.

    change

    B.

    do not change


  5. One molecule of oxygen is __________ times heavier than the hydrogen atom.

  6. A.

    12

    B.

    14

    C.

    16

    D.

    32


  7. Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

  8. A.

    \(\frac { C_v } { C_p } = R\)

    B.

    cp - cv = R

    C.

    \(C_v = \frac{R}{(Y-1)}\)

    D.

    Both (B) and (C)


  9. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.

  10. A.

    Zeroth

    B.

    First

    C.

    Second