Power Engineering Chapter 114
Showing posts with label Power Engineering Chapter 114. Show all posts
Showing posts with label Power Engineering Chapter 114. Show all posts

The enthalpy of a vapour is

The enthalpy of a vapour is


a. Sensible heat of a liquid
b. Sensible heat of a liquid plus latent heat of evaporation
c. Latent heat of evaporation





Answer: B

Leakage tendency is determine by:

Leakage tendency is determine by:




a. Operating pressure
b. Viscosity
c. Density
d. Molecular mass
e. All of the above






Answer: E

The larger the difference between the temperature of the liquid refrigerant entering the evaporator and the actual evaporator temperature:

The larger the difference between the temperature of the liquid refrigerant entering the evaporator and the actual evaporator temperature:



a. The larger the refrigerating effect will be
b. The smaller the refrigerating effect will be
c. The larger the latent heat will be
d. The smaller the latent heat will be
e. The smaller the sensible heat will be






Answer: B

Which one of the following should a ideal refrigerant should NOT have?

Which one of the following should a ideal refrigerant should NOT have?




a. A low boiling point at atmospheric pressure
b. A high latent heat capacity: that is, it should require a large amount of heat to convert it from a liquid to a gas after its boiling point has been reached
c. A fairly low condensing pressure
d. An offensive odour
e. A nonpoisonous nature
f. A noncorrosive action on metals
g. A nonflammable and nonexplosive nature when mixed with air
h. A reasonable price







Answer: D

The refrigerating effect of a refrigerant is:

The refrigerating effect of a refrigerant is:




a. Equal to its latent heat of vaporization
b. Greater than its latent heat of vaporization
c. Less than its latent heat of vaporization
d. Equal to its specific heat capacity
e. Less than its net-refrigerating effect




Answer: A
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