A. +ve
B. -ve
C. 0
D. Either of the above three; depends on the nature of refrigerant
Thermodynamics for Chemical
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?
A. T
B. T and P
C. T, P and Z
D. T and Z
For an ideal liquid solution, which of the following is unity ?
A. Activity
B. Fugacity
C. Activity co-efficient
D. Fugacity co-efficient
The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are________________?
A. 5 & 3
B. 3.987 & 1.987
C. 1.987 & 0.66
D. 0.66 & 1.987
Which of the following is not a common refrigerant ?
A. Freon-12
B. Ethylene
C. Ammonia
D. Carbon dioxide
At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________?
A. 1.572
B. 1.9398
C. 3.389
D. 4.238
Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?
A. T2/(T1 – T2)
B. T1/(T1 – T2)
C. (T1 – T2)/T1
D. (T1 – T2)/T2
Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?
A. [∂(G/T)/∂T] = – (H/T2)
B. [∂(A/T)/∂T]V = – E/T2
C. Both A. and B.
D. Neither A. nor B.
The adiabatic throttling process of a perfect gas is one of constant enthalpy_________________?
A. In which there is a temperature drop
B. Which is exemplified by a non-steady flow expansion
C. Which can be performed in a pipe with a constriction
D. In which there is an increase in temperature
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
