Book 2 Review

Question 1

Which one of the following factors affect the leakage tendency of a refrigerant?
Select one:

A. Miscibility

B. Temperature

C. Enthalpy

D. Specific volume

E. Molecular mass

Answer 1

E. Molecular mass

Question 1

The shell and tube condenser is fitted with:
Select one:

A. Dry boxes

B. Wet boxes

C. Water boxes

D. End plates

E. Water plates

Answer 1

C. Water boxes

Question 2

Screwed joints in refrigeration piping may be used on piping sizes up to _____ provided the refrigerant pressures do not exceed 1750 kPa.
Select one:

A. 38 mm (1½ in)

B. 76.2 mm (3 in)

C. 89 mm (3½ in)

D. 63.5 mm (2½ in)

E. 51 mm (2 in)

Answer 2

B. 76.2 mm (3 in)

Question 3

It is common practice to use rectangular ducts for the _____ section of a duct system and circular ducts for the branch runs to the outlets.
Select one:

A. Plenum

B. Register

C. Return

D. Supply

E. Grille

Answer 3

A. Plenum

Question 4

A disadvantage of the _____ method of capacity control is that the power required by the compressor does not change even though the amount of system cooling effect is reduced.
Select one:

A. Speed control

B. Hot gas bypass

C. Cylinder bypass

D. Compressor unloader

E. Intermittent operation

Answer 4

B. Hot gas bypass

Question 4

One of the advantages of using a heat exchanger in a compression refrigeration system is:
Select one:

A.
Increasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor

B. Increasing the temperature of the vapour from the evaporator helps to prevent liquid slugging in the evaporator

C. Decreasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor

D. Decreasing the temperature of the vapour from the evaporator helps to prevent liquid slugging in the compressor

E. Increasing the temperature of the vapour from the evaporator helps to prevent liquid slugging in the compressor

Answer 4

E. Increasing the temperature of the vapour from the evaporator helps to prevent liquid slugging in the compressor

Question 5

The distributor in a compression refrigeration system is directly downstream from the:
Select one:

A. Compressor

B. Expansion valve

C. Evaporator

D. Receiver

E. Condenser

Answer 5

B. Expansion valve

Question 6

Intercoolers should be provided with all of the following except a:
Select one:

A. Thermometer on the cooling water side

B. Shut off valve

C. Pressure gauge

D. Safety valve

E. Thermometer on the compressed air side

Answer 6

B. Shut off valve