Thermodynamics MCQs

A. It should be non-explosive

B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

C. Its vapor pressure at the condenser temperature should be very high

D. None of these

A. Directly proportional to pressure

B. Inversely proportional to pressure

C. Unity at all pressures

D. None of these

A. It is exothermic

B. It is isenthalpic

C. It takes place isothermally

D. It takes place at constant volume

A. 0

B. 1

C. < 1

D. > 1

A. Vapor compression cycle using expansion valve

B. Air refrigeration cycle

C. Vapor compression cycle using expansion engine

D. Carnot refrigeration cycle

A. Use of only one graph for all gases

B. Covering of wide range

C. Easier plotting

D. More accurate plotting

A. 0.15

B. 1.5

C. 4.5

D. 6.5

A. No heat and mass transfer

B. No mass transfer but heat transfer

C. Mass and energy transfer

D. None of these

A. Is the most efficient of all refrigeration cycles

B. Has very low efficiency

C. Requires relatively large quantities of air to achieve a significant amount of refrigeration

D. Both B and C

A. CV

B. Enthalpy change

C. Free energy change

D. None of these