Question 1

In a water-cooled condenser with dirty condenser tubes, the temperature difference between the refrigerant and the leaving water will be ____ when the tubes are clean.

Accepted Answer

A)   less than
B)   greater than
C)   the same as
D)   slightly lower thanE) B) and C)
F) C) and D)

Question 2

Describe the construction of the tube-within-a-tube condensers .

Accepted Answer

The tube-within-a-tube is manufactured by slipping one pipe inside another and sealing the ends in such a manner that the outer tube becomes one container and the inner tube becomes another container. The two pipes are then formed into a coil to save space .

Question 3

If an R-12 refrigeration system has its air-cooled condensing unit on a roof with an ambient air temperature of 100°F and the condenser outlet temperature (refrigerant)  is 115°F, with how much subcooling is the condenser operating ?

Accepted Answer

A)   15°F
B)   30°F
C)   100°F
D)   130°FE) A) and D)
F) A) and C)

Question 4

The heat in the vicinity of the ____________________ gas has a tendency to cause any minerals in the water to deposit onto the tube surface.

Accepted Answer

The answer of The heat in the vicinity of the...

Question 5

Which of the following can be used to maintain the head pressure of a system with an air-cooled condenser?

Accepted Answer

A)   Fan cycling.
B)   Condenser flooding.
C)   Dampers.
D)   All of the above.E) B) and D)
F) B) and C)

Question 6

The typical design temperature for the water entering a recirculating water system condenser is 85°F, and most systems have a ____ rise across the condenser.

Accepted Answer

A)   1°F
B)   5°F
C)   10°F
D)   15°FE) All of the above
F) B) and C)

Question 7

The shell-and-tube condenser is cleaned ____.

Accepted Answer

A)   with a brush after removing the end caps
B)   only with chemicals
C)   with compressed air
D)   with a vacuum cleanerE) B) and D)
F) A) and D) A

Question 8

When the evaporative condenser is used in cold climates, freeze protection must be provided in winter .

Accepted Answer

A) True 
 B)False

Question 9

The refrigerant in a condenser in a refrigeration system ____.

Accepted Answer

A)   absorbs heat
B)   rejects heat
C)   changes to a vapor
D)   is under lower pressure than the evaporatorE) A) and B)
F) None of the above

Question 10

What can be used to maintain the head pressure of a system with a water-cooled condenser?

Accepted Answer

A)   Fan cycling.
B)   Dampers or louvers.
C)   Water regulating valve.
D)   All of the above.E) All of the above
F) A) and D)

Question 11

If the spring pressure of a water regulating valve is increased, the system head pressure will also increase.

Accepted Answer

A) True 
 B)False

Question 12

A water regulating valve helps to maintain a system's head pressure by modulating the flow of refrigerant through the condenser.

Accepted Answer

A) True 
 B)False

Question 13

Low suction pressures, iced coils, short cycling, and inefficient cooling, can also result from low head pressures .

Accepted Answer

A) True 
 B)False  True

Question 14

In a water-cooled condenser, a regulating valve is used to control the ____.

Accepted Answer

A)   refrigerant flow through the pressure reducing device
B)   refrigerant head pressure
C)   suction pressure
D)   water temperatureE) A) and C)
F) All of the above

Question 15

A normally operating water-cooled condenser is operating with a 10°F differential between water in and water out. If scale forms on the water tubes and the entering water is 85°F, which of the following is possible ?

Accepted Answer

A)   The outlet water temperature will be lower than expected.
B)   The system head pressure will rise.
C)   The water regulating valve will close.
D)   Both a and b are correct.E) A) and C)
F) B) and C)

Question 16

High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn can starve evaporators .

Accepted Answer

A) True 
 B)False

Question 17

Hard starting may also occur in a low ambient condition, causing low head pressures .

Accepted Answer

A) True 
 B)False

Question 18

In a recirculating water system condenser, the leaving water temperature is normally ____________________°F lower than the condensing temperature of the refrigerant .

Accepted Answer

The answer of In a recirculating water system condenser, the...

Question 19

The water circuit in shell-and-coil and tube-within-a-tube coil condensers must be cleaned ____.

Accepted Answer

A)   by removing the end caps
B)   with a brush
C)   chemically
D)   by air pressureE) A) and B)
F) B) and D)

Question 20

In order for a flooded condenser type head pressure control system to operate, a device called a(n) ____________________ holds the extra refrigerant in warmer weather when the condenser doesn't need to be flooded .

Accepted Answer

The answer of In order for a flooded condenser type...

Exam 22: Condensers

In a water-cooled condenser with dirty condenser tubes, the temperature difference between the refrigerant and the leaving water will be ____ when the tubes are clean.

Correct AnswerverifiedShow Answer

Describe the construction of the tube-within-a-tube condensers .

Correct AnswerverifiedThe tube-within-a-tube is manufactured by slipping one pipe inside another and sealing the ends in such a manner that the outer tube becomes one container and the inner tube becomes another container. The two pipes are then formed into a coil to save space .

If an R-12 refrigeration system has its air-cooled condensing unit on a roof with an ambient air temperature of 100°F and the condenser outlet temperature (refrigerant) is 115°F, with how much subcooling is the condenser operating ?

Correct AnswerverifiedShow Answer

The heat in the vicinity of the ____________________ gas has a tendency to cause any minerals in the water to deposit onto the tube surface.

Correct AnswerverifiedShow Answer

Which of the following can be used to maintain the head pressure of a system with an air-cooled condenser?

Correct AnswerverifiedShow Answer

The typical design temperature for the water entering a recirculating water system condenser is 85°F, and most systems have a ____ rise across the condenser.

Correct AnswerverifiedShow Answer

The shell-and-tube condenser is cleaned ____.

Correct AnswerverifiedA

When the evaporative condenser is used in cold climates, freeze protection must be provided in winter .

Correct AnswerverifiedShow Answer

The refrigerant in a condenser in a refrigeration system ____.

Correct AnswerverifiedShow Answer

What can be used to maintain the head pressure of a system with a water-cooled condenser?

Correct AnswerverifiedShow Answer

If the spring pressure of a water regulating valve is increased, the system head pressure will also increase.

Correct AnswerverifiedShow Answer

A water regulating valve helps to maintain a system's head pressure by modulating the flow of refrigerant through the condenser.

Correct AnswerverifiedShow Answer

Low suction pressures, iced coils, short cycling, and inefficient cooling, can also result from low head pressures .

Correct AnswerverifiedTrue

In a water-cooled condenser, a regulating valve is used to control the ____.

Correct AnswerverifiedShow Answer

A normally operating water-cooled condenser is operating with a 10°F differential between water in and water out. If scale forms on the water tubes and the entering water is 85°F, which of the following is possible ?

Correct AnswerverifiedShow Answer

High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn can starve evaporators .

Correct AnswerverifiedShow Answer

Hard starting may also occur in a low ambient condition, causing low head pressures .

Correct AnswerverifiedShow Answer

In a recirculating water system condenser, the leaving water temperature is normally ____________________°F lower than the condensing temperature of the refrigerant .

Correct AnswerverifiedShow Answer

The water circuit in shell-and-coil and tube-within-a-tube coil condensers must be cleaned ____.

Correct AnswerverifiedShow Answer

In order for a flooded condenser type head pressure control system to operate, a device called a(n) ____________________ holds the extra refrigerant in warmer weather when the condenser doesn't need to be flooded .

Correct AnswerverifiedShow Answer

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The tube-within-a-tube is manufactured by slipping one pipe inside another and sealing the ends in such a manner that the outer tube becomes one container and the inner tube becomes another container. The two pipes are then formed into a coil to save space .

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True

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