GATE Chemical Engineering Thermodynamics Questions - Set 30 - ObjectiveBooks
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# Practice Test: Question Set - 30

1. Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.
(A) The same
(B) Less than
(C) Greater than
(D) Different than

2. Specific heat of a gas for a reversible adiabatic process is
(A) Negative
(B) Zero
(C) Infinity
(D) None of these

3. Specific/molar Gibbs free energy for a pure substance does not change during
(A) Sublimation
(B) Vaporization
(C) Melting
(D) Either (a), (b) or (c)

4. Pick out the correct statement.
(A) The available energy in an isolated system for all irreversible (real) processes decreases
(B) The efficiency of a Carnot engine increases, if the sink temperature is decreased
(C) The reversible work for compression in non-flow process under isothermal condition is the change in Helmholtz free energy
(D) All (a), (b) and (c)

5. 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is
(A) 4 J
(B)
(C) 0
(D) 8 J

6. The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is
(A) (∂T/∂V)S = - (∂P/∂S)V
(B) (∂S/∂P)T = - (∂V/∂T)P
(C) (∂V/∂S)P = (∂T/∂P)S
(D) (∂S/∂V)T = (∂P/∂T)V

7. One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one
(A) Hour
(B) Day
(C) Minute
(D) Second

8. A gas shows deviation from ideal behavior at
(A) Low pressure and high temperature
(B) Low pressure and low temperature
(C) Low temperature and high pressure
(D) High temperature and high pressure

9. A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is
(A) -1.87
(B) 0
(C) 1.26
(D) 3.91

10. Entropy of the system decreases, when
(A) Snow melts into water
(B) A gas expands spontaneously from high pressure to low pressure
(C) Water is converted into ice
(D) Both (b) & (c)

11. In the reaction, H2 +I2  2HI, addition of an inert gas will
(A) Increase the partial pressure of H2
(B) Increase the partial pressure of I2
(C) Increase the total pressure and hence shift the equilibrium towards the right
(D) Not affect the equilibrium conditions

12. It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.
(A) The amount of work needed is path dependent
(B) Work alone cannot bring out such a change of state
(C) The amount of work needed is independent of path
(D) More information is needed to conclude anything about the path dependence or otherwise of the work needed

13. Partial molar free energy of an element A in solution is same as its
(A) Chemical potential
(B) Activity
(C) Fugacity
(D) Activity co-efficient

14. Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)
(A) T
(B) √T
(C) T2
(D) 1/√T

15. Which of the following has the minimum value of COP for a given refrigeration effect?
(A) Reverse Carnot cycle
(B) Ordinary vapor-compression cycle
(C) Vapor-compression process with a reversible expansion engine
(D) Air refrigeration cycle

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