Evaporative condenser can save up to __ to __ percent in water consumption

Evaporative condenser can save up to __ to __ percent in water consumption

a. 50 to 60
b. 60 to 70
c. 70 to 80
d. 80 to 90





Answer: D

Which one is NOT true about the shell and tube condenser?

Which one is NOT true about the shell and tube condenser?

a. High maintenance cost
b. High cooling efficiency
c. Cleaned easily
d. Used in medium to large air conditioning installations





Answer: A

Which of the following are direct expansion evaporators and flooded evaporators? 1. bare tube 2. the plate surface 3. the shell and tube 4. the finned tube

Which of the following are direct expansion evaporators and flooded evaporators?
1. bare tube
2. the plate surface
3. the shell and tube
4. the finned tube

a. 1,3
b. 2,3
c. 1,2,4
d. 1,2,3,4





Answer: A

Which of the following are direct expansion evaporators? 1. bare tube 2. the plate surface 3. the shell and tube 4. the finned tube

Which of the following are direct expansion evaporators?
1. bare tube
2. the plate surface
3. the shell and tube
4. the finned tube

a. 1,3
b. 2,3
c. 1,2,4
d. 1,2,3,4





Answer: D

Bare tube evaporators are applied where the space temperature is maintained below

Bare tube evaporators are applied where the space temperature is maintained below

a. 3C
b. 2C
c. 1C
d. 0C
e. -1C







Answer: C

The common types of evaporators used in refrigeration systems are: 1. bare tube 2. the shell and coil 3. the plate surface 4. the shell and tube 5. double tube 6. the finned tube

The common types of evaporators used in refrigeration systems are:
1. bare tube
2. the shell and coil
3. the plate surface
4. the shell and tube
5. double tube
6. the finned tube

a. 1, 2, 3, 4
b. 1, 3, 4, 6
c. 2, 3, 4, 5
d. 3, 5, 6, 7
e. 4, 5, 6, 7




Answer: B

The purpose of a condenser in a refrigeration system is

The purpose of a condenser in a refrigeration system is

a) to remove the sensible heat from the refrigerant
b) to remove the latent heat from the refrigerant
c) to cool the liquid refrigerant
d) to vaporize the liquid refrigerant
e) to reduce the pressure in the evaporator





Answer: B

Defective condenser operation is a result of the presence of all of the following except

Defective condenser operation is a result of the presence of all of the following except

a) scale forming chemicals
b) dirty cooling water
c) non-condensable gases
d) low coolant circulation
e) compressor lubricating oil

Answer: E

The common types of water-cooled condensers used in refrigeration systems are: 1. the shell and tube 2. the shell and coil 3. the double tube 4. the plate surface

The common types of water-cooled condensers used in refrigeration systems are:
1. the shell and tube
2. the shell and coil
3. the double tube
4. the plate surface

a) 1, 2, 3
b) 1, 3, 4
c) 2, 3, 4
d) 1, 2, 4
e) 3, 4





Answer: A

Which of the following statements about the shell and tube evaporator type is false?

Which of the following statements about the shell and tube evaporator type is false?

a) It is also known as a chiller.
b) This type of evaporator cools mainly liquids.
c) The refrigerant is circulating in the shell in the flooded operation.
d) Refrigerant vapour is drawn out of the evaporator by the compressor.
e) The liquid to be cooled circulates through the tubes in the direct-expansion operation.

Answer: E

The amount of water used in the evaporative condenser of a refrigeration plant is only a small percentage of that used in a water condenser of the same capacity, because

The amount of water used in the evaporative condenser of a refrigeration plant is only a small percentage of that used in a water condenser of the same capacity, because

a. Evaporating condensers also use air to cool the refrigerant
b. The evaporating condensers spray refrigerated water onto condensing coil
c. The cooling water evaporates, removing far more heat per kilogram of system coolant
d. Of water conservation methods
e. Of the scarcity of water in locations that use evaporative condensers






Answer: C

Which of the following statements about the shell and tube refrigeration evaporator is false?

Which of the following statements about the shell and tube refrigeration evaporator is false?

a. It is also known as a chiller
b. The brine circulates through the tubes in a direct-expansion chiller
c. The refrigerant is contained in the shell, and surrounds the tubes, in the flooded chiller
d. Refrigerant vapour is drawn out of the evaporator by the compressor
e. This type of evaporator cools mainly liquids





Answer: B

All refrigeration evaporators:

All refrigeration evaporators:

a. require regular defrosting
b. are part of the high side of the system
c. are located between the expansion valve and the king valve.
d. are flooded with refrigerant
e. boil liquid refrigerant at low pressure and low temperature







Answer: E

Of the following refrigeration system evaporators, the ___________ evaporators require the greatest refrigerant charge.

Of the following refrigeration system evaporators, the ___________ evaporators require the greatest refrigerant charge.

a. Direct expansion
b. Bare tube
c. Plate surface
d. Flooded
e. Finned tube






Answer: D

The refrigeration condenser design that requires the tubes to be cleaned with acid and then neutralized, is the:

The refrigeration condenser design that requires the tubes to be cleaned with acid and then neutralized, is the:

a. Shell and tube condenser
b. Shell and coil condenser
c. Air-cooled condenser
d. Evaporative condensers
e. Baffle condensers






Answer: B

Which of the following statements about double tube refrigeration condensers is true?

Which of the following statements about double tube refrigeration condensers is true?

a. They consist of two separate tubes side by side
b. They are easy to clean
c. Water flows in the inner tube in the opposite direction of the flow of refrigerant
d. They have the highest efficiency of the water-cooled condensers
e. They have a large cooling capacity combined with a small size.




Answer: C

With regard to refrigeration systems, large-capacity air-cooled condensers are found mainly

With regard to refrigeration systems, large-capacity air-cooled condensers are found mainly

a. on roof tops
b. in indoor mechanical rooms, with ductwork supplying cooling air
c. in locations where water is plentiful
d. where they are protected from the environment
e. in systems where the high-side pressure does not exceed 103 kPa

Answer: A

Dry and flooded evaporators differ principally in what respect?

Dry and flooded evaporators differ principally in what respect?

a. The dry evaporator is designed to cool gases only
b. The heat transfer surfaces of a flooded evaporator are kept covered with liquid refrigerant
c. Flooded systems primarily use B1 and B2 refrigerants
d. Dry evaporators use low-side floats, whereas flooded evaporators use high-side floats
e. The drift eliminators in a dry evaporator are considerably smaller

Answer: B

Which of the following is NOT a form of refrigeration evaporator construction?

Which of the following is NOT a form of refrigeration evaporator construction?

a. Bare tube
b. Plate surface
c. Shell and tube
d. Finned tube
e. Double-tube







Answer: E

The refrigeration evaporator that increases heat exchange by crimping several thin metal plates to single-wall tubes is a

The refrigeration evaporator that increases heat exchange by crimping several thin metal plates to single-wall tubes is a

a. Plate surface evaporator
b. Bare tube evaporator
c. Shell and tube evaporator
d. Finned tube evaporator
e. Double tube






Answer: D