A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils
B. Not have unduly high vapour pressure at the condenser temperature
C. Both A. and B
D. Have low specific heat
Related Mcqs:
- “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?
A. Raoult’s
B. Henry’s
C. Amagat’s
D. None of these - Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?
A. Positive
B. Negative
C. Zero
D. Infinity - Which of the following is not a common refrigerant ?
A. Freon-12
B. Ethylene
C. Ammonia
D. Carbon dioxide - Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?
A. Freon
B. Liquid sulphur dioxide
C. Methyl chloride
D. Ammonia - Pick out the undesirable property for a good refrigerant ?
A. High thermal conductivity
B. Low freezing point
C. Large latent heat of vaporisation
D. High viscosity - High _____________ is an undesirable property for a good refrigerant?
A. Specific heat
B. Latent heat of vaporisation
C. Viscosity
D. Specific vapor volume - Which is not a refrigerant ?
A. SO2
B. NH3
C. CCl2F2
D. C2H4Cl2 - Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?
A. d ln p/dt = Hvap/RT2
B. d ln p/dt = RT2/Hvap
C. dp/dt = RT2/Hvap
D. dp/dt = Hvap/RT2 - If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in____________________?
A. Volume
B. Enthalpy
C. Both A. & B
D. Neither A. nor B - If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________?
A. Solubility increases as temperature increases
B. Solubility increases as temperature decreases
C. Solubility is independent of temperature
D. Solubility increases or decreases with temperature depending on the Gibbs free energy change
of solution
