When a gas is subjected to adiabatic expansion, it gets cooled due to__________________?

Related Mcqs:

1. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?

   A. (∂P/∂V)S = (∂P/∂V)T
   B. (∂P/∂V)S = [(∂P/∂V)T]Y
   C. (∂P/∂V)S = y(∂P/∂V)T
   D. (∂P/∂V)S = 1/y(∂P/∂V)T

2. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?

   A. Do not lose energy on collision
   B. Are above the inversion temperature
   C. Do not exert attractive force on each other
   D. Do work equal to loss in kinetic energy

3. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ?

   A. Logarithmic
   B. Arithmetic
   C. Geometric
   D. Harmonic

4. Gases are cooled in Joule-Thomson expansion, when it is _____________ inversion temperature?

   A. Below
   B. At
   C. Above
   D. Either B. or C.

5. During adiabatic expansion of gas___________________?

   A. Pressure remains constant
   B. Pressure is increased
   C. Temperature remains constant
   D. None of these

6. What happens in a reversible adiabatic expansion process ?

   A. Heating takes place
   B. Cooling takes place
   C. Pressure is constant
   D. Temperature is constant

7. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?

   A. V1/V2
   B. V2/V1
   C. V1 – V2
   D. V1.V2

8. The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

   A. 2M
   B. M/2
   C. M
   D. M/4

9. A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

   A. 0°C
   B. 0°K
   C. -136.5°C
   D. -136.5°K

10. The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only?

    A. Temperature
    B. Specific heat
    C. Volume
    D. Pressure