Question 1

A chiller is used to:

Accepted Answer

A)  cool water in the evaporator. 
B)  cool water in the cooling tower. 
C)  cool air in the evaporator. 
D)  cool water in the condenser. 
A)  cool water in the evaporator. 
B)  cool water in the cooling tower. 
C)  cool air in the evaporator. 
D)  cool water in the condenser. A

Question 2

What ultimate purpose does the evaporator serve?

Accepted Answer

A)  It mixes cool refrigerant with a room's air. 
B)  It evaporates the refrigerant from a liquid into a gas. 
C)  It removes heat from the room's air. 
D)  It expels heat from the refrigerant into the outdoor air. 
A)  It mixes cool refrigerant with a room's air. 
B)  It evaporates the refrigerant from a liquid into a gas. 
C)  It removes heat from the room's air. 
D)  It expels heat from the refrigerant into the outdoor air. C

Question 3

Refrigeration condenser and evaporator coils should be kept clean because:

Accepted Answer

A)  accumulated dirt and dust will reduce the property's resale value. 
B)  accumulated dirt and dust attract mice. 
C)  accumulated dirt and dust are unattractive. 
D)  accumulated dirt and dust form a layer of insulation. 
A)  accumulated dirt and dust will reduce the property's resale value. 
B)  accumulated dirt and dust attract mice. 
C)  accumulated dirt and dust are unattractive. 
D)  accumulated dirt and dust form a layer of insulation. D

Question 4

Which of the following is not an advantage of a PTAC unit?

Accepted Answer

A)  quiet operation 
B)  low installation costs 
C)  low material costs 
D)  easy to maintain 
A)  quiet operation 
B)  low installation costs 
C)  low material costs 
D)  easy to maintain

Question 5

What ultimate purpose does the condenser serve?

Accepted Answer

A)  removes heat from the room so that it can reduce the room's air temperature 
B)  It adds heat to the refrigerant so that it can cool off in the expansion valve. 
C)  removes heat from the refrigerant so that it can change state from a gas to a liquid 
D)  It heats water so that it can evaporate in the cooling tower. 
A)  removes heat from the room so that it can reduce the room's air temperature 
B)  It adds heat to the refrigerant so that it can cool off in the expansion valve. 
C)  removes heat from the refrigerant so that it can change state from a gas to a liquid 
D)  It heats water so that it can evaporate in the cooling tower.

Question 6

Ceiling fans can reduce the perceived temperature of a space by:

Accepted Answer

A)  10 - 15° F. 
B)  15 - 20° F. 
C)  5 - 10° F. 
D)  Ceiling fans do not reduce the dry-bulb temperature. 
A)  10 - 15° F. 
B)  15 - 20° F. 
C)  5 - 10° F. 
D)  Ceiling fans do not reduce the dry-bulb temperature.

Question 7

Which of the following is not an example of an internal cooling load?

Accepted Answer

A)  ovens 
B)  mixing (outside) air 
C)  lighting 
D)  computers 
A)  ovens 
B)  mixing (outside) air 
C)  lighting 
D)  computers

Question 8

Condenser water cools in the cooling tower through:

Accepted Answer

A)  convection heat transfer. 
B)  evaporative heat transfer. 
C)  radiant heat transfer. 
D)  None of the above 
A)  convection heat transfer. 
B)  evaporative heat transfer. 
C)  radiant heat transfer. 
D)  None of the above

Question 9

Dehumidification is achieved by:

Accepted Answer

A)  completely closing the fresh-air intake to the system. 
B)  passing humid air over a pipe containing cold water or refrigerant, which causes the water to condense on the pipe an drip into a drain pan. 
C)  not operating an HVAC system on days when the relative humidity is high. 
D)  passing humid air through a filter that removes the water. 
A)  completely closing the fresh-air intake to the system. 
B)  passing humid air over a pipe containing cold water or refrigerant, which causes the water to condense on the pipe an drip into a drain pan. 
C)  not operating an HVAC system on days when the relative humidity is high. 
D)  passing humid air through a filter that removes the water.

Question 10

From a physics perspective, there is no such thing as cold -- there is only an absence of heat.

Accepted Answer

A) True 
 B)False

Question 11

When a refrigerant leaves the condenser, what physical state is it in?

Accepted Answer

A)  a cold, low-pressure liquid 
B)  a warm, high-pressure liquid 
C)  a hot, high-pressure gas 
D)  a hot, low-pressure gas 
A)  a cold, low-pressure liquid 
B)  a warm, high-pressure liquid 
C)  a hot, high-pressure gas 
D)  a hot, low-pressure gas

Question 12

Chilled water in a central air conditioning system is used to:

Accepted Answer

A)  make ice cubes in an ice machine. 
B)  remove heat from the warm, humid air that is in the room. 
C)  cool people in a room by spraying a light, cooling mist over them. 
D)  mix with the refrigerant to remove heat from the refrigerant. 
A)  make ice cubes in an ice machine. 
B)  remove heat from the warm, humid air that is in the room. 
C)  cool people in a room by spraying a light, cooling mist over them. 
D)  mix with the refrigerant to remove heat from the refrigerant.

Question 13

When the refrigerant leaves the compressor, what physical state is it in?

Accepted Answer

A)  a hot, high-pressure gas 
B)  a cold, low-pressure liquid 
C)  a hot, low-pressure gas 
D)  a warm, high-pressure liquid 
A)  a hot, high-pressure gas 
B)  a cold, low-pressure liquid 
C)  a hot, low-pressure gas 
D)  a warm, high-pressure liquid

Question 14

We need to repair leaks in the refrigeration system because:

Accepted Answer

A)  losing refrigerant will reduce the efficiency of the heat transfer, costing us electricity and money. 
B)  losing refrigerant will force the system to work harder, resulting in early compressor failure. 
C)  the refrigerant chemical is dangerous for human exposure. 
D)  All of the above 
A)  losing refrigerant will reduce the efficiency of the heat transfer, costing us electricity and money. 
B)  losing refrigerant will force the system to work harder, resulting in early compressor failure. 
C)  the refrigerant chemical is dangerous for human exposure. 
D)  All of the above

Question 15

According to Boyle's Law, pressure and volume have a(n):

Accepted Answer

A)  positive relationship. 
B)  perverse relationship. 
C)  transverse relationship. 
D)  inverse relationship. 
A)  positive relationship. 
B)  perverse relationship. 
C)  transverse relationship. 
D)  inverse relationship.

A chiller is used to:

What ultimate purpose does the evaporator serve?

Refrigeration condenser and evaporator coils should be kept clean because:

Which of the following is not an advantage of a PTAC unit?

What ultimate purpose does the condenser serve?

Ceiling fans can reduce the perceived temperature of a space by:

Which of the following is not an example of an internal cooling load?

Condenser water cools in the cooling tower through:

Dehumidification is achieved by:

From a physics perspective, there is no such thing as cold -- there is only an absence of heat.

When a refrigerant leaves the condenser, what physical state is it in?

Chilled water in a central air conditioning system is used to:

When the refrigerant leaves the compressor, what physical state is it in?

We need to repair leaks in the refrigeration system because:

According to Boyle's Law, pressure and volume have a(n):

The Study of Facilities Mangement

The Engineering Department

Issues and Trends

Solid and Hazardous Waste

Water Systems

Electrical Systems

Heating Systems

Ventilation Systems

Life Safety and Security

Vertical Transportation

Food Service and Laundry Systems

The Building Envelope and Exterior Elements

Filters

Exam 8: Cooling Systems

A chiller is used to:

What ultimate purpose does the evaporator serve?

Refrigeration condenser and evaporator coils should be kept clean because:

Which of the following is not an advantage of a PTAC unit?

What ultimate purpose does the condenser serve?

Ceiling fans can reduce the perceived temperature of a space by:

Which of the following is not an example of an internal cooling load?

Condenser water cools in the cooling tower through:

Dehumidification is achieved by:

From a physics perspective, there is no such thing as cold -- there is only an absence of heat.

When a refrigerant leaves the condenser, what physical state is it in?

Chilled water in a central air conditioning system is used to:

When the refrigerant leaves the compressor, what physical state is it in?

We need to repair leaks in the refrigeration system because:

According to Boyle's Law, pressure and volume have a(n):

The Study of Facilities Mangement

The Engineering Department

Issues and Trends

Solid and Hazardous Waste

Water Systems

Electrical Systems

Heating Systems

Ventilation Systems

Life Safety and Security

Vertical Transportation

Food Service and Laundry Systems

The Building Envelope and Exterior Elements

Filters