What is the ratio of adiabatic compressibility to isothermal compressibility ?

Related Mcqs:

1. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?

   A. 0
   B. +ve
   C. -ve
   D. ∞

2. 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

3. The work done in isothermal compression compared to that in adiabatic compression will be__________________?

   A. Less
   B. More
   C. Same
   D. More or less depending upon the extent of work done

4. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?

   A. Cp < Cv
   B. Cp = Cv
   C. Cp > Cv
   D. C ≥ Cv

5. Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?

   A. Always greater than one
   B. Same at the same reduced temperature
   C. Same at the same reduced pressure
   D. Both B. & C

6. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?

   A. 300 × (32/7)
   B. 300 × (33/5)
   C. 300 × (333/7)
   D. 300 × (35/7)

7. Compressibility factor of a gas is___________________?

   A. Not a function of its pressure
   B. Not a function of its nature
   C. Not a function of its temperature
   D. Unity, if it follows PV = nRT

8. The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________?

   A. 1
   B. 1
   D. Either B. or C, depends on the nature of the gas

9. Critical compressibility factor for all substances___________________?

   A. Are more or less constant (vary from 0.2 to 0.3)
   B. Vary as square of the absolute temperature
   C. Vary as square of the absolute pressure
   D. None of these

10. Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?

    A. Use of only one graph for all gases
    B. Covering of wide range
    C. Easier plotting
    D. More accurate plotting