A. Fugacity
B. Activity co-efficient
C. Free energy
D. All A, B. & C
Related Mcqs:
- Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?
A. Decreases
B. Increases
C. Remains constant
D. Decreases logarithmically - Which of the following is not affected by temperature changes ?
A. Fugacity
B. Activity co-efficient
C. Free energy
D. None of these - Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?
A. 0
B. ∞
C. +ve
D. -ve - Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
A. A homogeneous solution (say of phenol water) is formed
B. Mutual solubility of the two liquids shows a decreasing trend
C. Two liquids are completely separated into two layers
D. None of these - The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?
A. 0
B. 100
C. 50
D. None of these - Critical temperature is defined as the temperature above which a gas will____________________?
A. Not liquify (barring exceptions)
B. Immediately liquify
C. Never liquify however high the pressure may be
D. None of these - In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?
A. Enhanced COP
B. Decreased COP
C. No change in the value of COP
D. Increased or decreased COP; depending upon the type of refrigerant - A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature?
A. Less than
B. More than
C. Equal to or higher than
D. Less than or equal to - The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system?
A. Lowest
B. Highest
C. Average
D. None of these - Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
A. Increased COP
B. Same COP
C. Decreased COP
D. Increased or decreased COP; depending upon the type of refrigerant
