Commercial Refrigeration > Units 21, 22,
23, 24 Complete Questions and Answers
(Graded A+)
The process of removing heat from a place where it is not wanted and transferring that heat to a
place where it makes little or no difference is known as ____. - ANSWER - refrigeration
The household refrigerator fresh-food compartment is a good example of ____ refrigeration. -
ANSWER - medium-temperature
The household refrigerator fresh-food compartment typically ranges from ____. - ANSWER - 28
to 40°F
Low-temperature food storage applications generally start at ____. - ANSWER - 0°F
High-temperature refrigeration applications will normally provide box temperatures of ____. -
ANSWER - 47 to 60°F
A refrigeration system designed for the storage of flowers or candy is considered a ____ type. -
ANSWER - high temperature
The ____ in a refrigeration system is responsible for absorbing heat into the system from
whatever medium is to be cooled. - ANSWER - evaporator
The boiling temperature and its relationship to the system exist in the ____. - ANSWER -
evaporator
A typical evaporator operating temperature in an air-conditioning system is ____. - ANSWER -
40°F
, The ____ of the liquid refrigerant determines the coil operating temperature. - ANSWER - boiling
temperature
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15 psig, what is the
pressure at the inlet of the evaporator? - ANSWER - 25 psig
Evaporators that are operated full of liquid and are equipped with a device to keep the liquid
refrigerant from passing to the compressor are known as ____. - ANSWER - flooded
evaporators
A direct expansion-type evaporator is also called a ____. - ANSWER - dry-type evaporator
____ is the best method of checking to see when a refrigerant coil has a proper level of
refrigerant. - ANSWER - Superheat
A typical superheat for an evaporator operating under normal conditions would be ____. -
ANSWER - 8 to 12°F
If the application requires a coil design to operate below freezing, there must be provision for
____. - ANSWER - defrost
The refrigeration evaporator is a component that absorbs heat from the conditioned space into
the refrigeration system. - ANSWER - true
The film factor is a relationship between the medium giving up heat and the heat-exchange
surface. - ANSWER - true
A stamped plate evaporator usually does not use a fan to move air across it. - ANSWER - true
The capacity (tonnage) of the heat exchanger can vary with its height and depth. - ANSWER -
true
Every central split cooling system manufactured in the USA today must have a Seasonal Energy
Efficiency Ratio (SEER) of at least 10. - ANSWER - false
23, 24 Complete Questions and Answers
(Graded A+)
The process of removing heat from a place where it is not wanted and transferring that heat to a
place where it makes little or no difference is known as ____. - ANSWER - refrigeration
The household refrigerator fresh-food compartment is a good example of ____ refrigeration. -
ANSWER - medium-temperature
The household refrigerator fresh-food compartment typically ranges from ____. - ANSWER - 28
to 40°F
Low-temperature food storage applications generally start at ____. - ANSWER - 0°F
High-temperature refrigeration applications will normally provide box temperatures of ____. -
ANSWER - 47 to 60°F
A refrigeration system designed for the storage of flowers or candy is considered a ____ type. -
ANSWER - high temperature
The ____ in a refrigeration system is responsible for absorbing heat into the system from
whatever medium is to be cooled. - ANSWER - evaporator
The boiling temperature and its relationship to the system exist in the ____. - ANSWER -
evaporator
A typical evaporator operating temperature in an air-conditioning system is ____. - ANSWER -
40°F
, The ____ of the liquid refrigerant determines the coil operating temperature. - ANSWER - boiling
temperature
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15 psig, what is the
pressure at the inlet of the evaporator? - ANSWER - 25 psig
Evaporators that are operated full of liquid and are equipped with a device to keep the liquid
refrigerant from passing to the compressor are known as ____. - ANSWER - flooded
evaporators
A direct expansion-type evaporator is also called a ____. - ANSWER - dry-type evaporator
____ is the best method of checking to see when a refrigerant coil has a proper level of
refrigerant. - ANSWER - Superheat
A typical superheat for an evaporator operating under normal conditions would be ____. -
ANSWER - 8 to 12°F
If the application requires a coil design to operate below freezing, there must be provision for
____. - ANSWER - defrost
The refrigeration evaporator is a component that absorbs heat from the conditioned space into
the refrigeration system. - ANSWER - true
The film factor is a relationship between the medium giving up heat and the heat-exchange
surface. - ANSWER - true
A stamped plate evaporator usually does not use a fan to move air across it. - ANSWER - true
The capacity (tonnage) of the heat exchanger can vary with its height and depth. - ANSWER -
true
Every central split cooling system manufactured in the USA today must have a Seasonal Energy
Efficiency Ratio (SEER) of at least 10. - ANSWER - false
