What happens in a reversible adiabatic compression ?

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. What happens in a reversible adiabatic expansion process ?

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

3. 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)

4. 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

5. Entropy change in case of reversible adiabatic process is________________?

   A. Minimum
   B. Zero
   C. Maximum
   D. Indeterminate

6. Specific heat of a gas for a reversible adiabatic process is________________?

   A. Negative
   B. Zero
   C. Infinity
   D. None of these

7. Which of the following is not correct for a reversible adiabatic process ?

   A. TVγ-1 = constant
   B. p1-γ.TY = constant
   C. PVγ = constant
   D. None of these

8. Adiabatic compression of a saturated water vapour makes it ____________________ ?

   A. Supersaturated
   B. Superheated
   C. Both A. and B
   D. Neither A. nor B

9. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?

   A. Δ S1 is always Δ SR
   C. Δ S1 is always > Δ SR
   D. Δ S1 is always = Δ SR

10. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

    A. Isobaric
    B. Isothermal
    C. Adiabatic
    D. None of these