Commercial and Domestic Refrigeration
Questions and Answers (Graded A+)
Low-temperature food storage applications generally start at - ANSWER - 0°F
If the application requires a coil design to operate below freezing, there must be provision for -
ANSWER - defrost
A typical superheat for an evaporator operating under normal conditions would be - ANSWER -
8 to 12°F
High-temperature refrigeration applications will normally provide box temperatures of -
ANSWER - 47 to 60°F
the air means to remove the moisture, and this is frequently desirable in refrigeration systems. -
ANSWER - dehumidifying
-temperature refrigeration produces temperatures below the freezing point of water. - ANSWER
- low
As a rule of thumb, the temperature of the evaporator should be about _°F colder than the box
temperature. - ANSWER - 15
The capacity (tonnage) of the heat exchanger can vary with its height and depth. - ANSWER -
false
The refrigeration evaporator is a component that absorbs heat from the conditioned space into
the refrigeration system. - ANSWER - true
is the best method of checking to see when a refrigerant coil has a proper level of refrigerant. -
ANSWER - superheat
,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 typically ranges from - ANSWER - 28 to
40°F
A direct expansion-type evaporator is also called a - ANSWER - dry-type evaporator
Every central split cooling system manufactured in the USA today must have a Seasonal Energy
Efficiency Ratio (SEER) of at least 10. - ANSWER - f
When the refrigerant vapor is saturated with heat it is known as a(n) - ANSWER - saturated
vapor
SEER is calculated based on the total amount of cooling the system will provide over the entire
season, divided by the total number of _ it will consume. - ANSWER - watts/hours
The ____ of the liquid refrigerant determines the coil operating temperature. - ANSWER - boiling
temperature
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
A defrost system that pipes the compressor discharge vapor directly to the evaporator is called
a(n) _ type. - ANSWER - hot gas defrost
The film factor is a relationship between the medium giving up heat and the heat-exchange
surface. - ANSWER - T
, 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 stamped plate evaporator usually does not use a fan to move air across it. - ANSWER - T
evaporators are used when the coil would become too long for a single circuit,percent vapor. -
ANSWER - Multicircuit
The household refrigerator fresh-food compartment is a good example of ____ refrigeration. -
ANSWER - medium-temp
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
A typical evaporator operating temperature in an air-conditioning system is - ANSWER - 40°F
To check the performance of a dry-type evaporator, the service technician would first make sure
that the refrigerant coil is operating with enough liquid inside. - ANSWER - T
The boiling temperature and its relationship to the system exist in the - ANSWER - Evaporators
Automatic pumpdown systems are equipped with a(n) _ to prevent refrigerant from reaching the
evaporator. - ANSWER - solenoid
The normal position for a suction service valve during normal operation is - ANSWER - any of
the 3
EPR valves are also referred to as ____ valves. - ANSWER - ORI
Refrigeration systems are designed to operate year round. For this reason they are equipped
with - ANSWER - a low ambient control
Questions and Answers (Graded A+)
Low-temperature food storage applications generally start at - ANSWER - 0°F
If the application requires a coil design to operate below freezing, there must be provision for -
ANSWER - defrost
A typical superheat for an evaporator operating under normal conditions would be - ANSWER -
8 to 12°F
High-temperature refrigeration applications will normally provide box temperatures of -
ANSWER - 47 to 60°F
the air means to remove the moisture, and this is frequently desirable in refrigeration systems. -
ANSWER - dehumidifying
-temperature refrigeration produces temperatures below the freezing point of water. - ANSWER
- low
As a rule of thumb, the temperature of the evaporator should be about _°F colder than the box
temperature. - ANSWER - 15
The capacity (tonnage) of the heat exchanger can vary with its height and depth. - ANSWER -
false
The refrigeration evaporator is a component that absorbs heat from the conditioned space into
the refrigeration system. - ANSWER - true
is the best method of checking to see when a refrigerant coil has a proper level of refrigerant. -
ANSWER - superheat
,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 typically ranges from - ANSWER - 28 to
40°F
A direct expansion-type evaporator is also called a - ANSWER - dry-type evaporator
Every central split cooling system manufactured in the USA today must have a Seasonal Energy
Efficiency Ratio (SEER) of at least 10. - ANSWER - f
When the refrigerant vapor is saturated with heat it is known as a(n) - ANSWER - saturated
vapor
SEER is calculated based on the total amount of cooling the system will provide over the entire
season, divided by the total number of _ it will consume. - ANSWER - watts/hours
The ____ of the liquid refrigerant determines the coil operating temperature. - ANSWER - boiling
temperature
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
A defrost system that pipes the compressor discharge vapor directly to the evaporator is called
a(n) _ type. - ANSWER - hot gas defrost
The film factor is a relationship between the medium giving up heat and the heat-exchange
surface. - ANSWER - T
, 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 stamped plate evaporator usually does not use a fan to move air across it. - ANSWER - T
evaporators are used when the coil would become too long for a single circuit,percent vapor. -
ANSWER - Multicircuit
The household refrigerator fresh-food compartment is a good example of ____ refrigeration. -
ANSWER - medium-temp
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
A typical evaporator operating temperature in an air-conditioning system is - ANSWER - 40°F
To check the performance of a dry-type evaporator, the service technician would first make sure
that the refrigerant coil is operating with enough liquid inside. - ANSWER - T
The boiling temperature and its relationship to the system exist in the - ANSWER - Evaporators
Automatic pumpdown systems are equipped with a(n) _ to prevent refrigerant from reaching the
evaporator. - ANSWER - solenoid
The normal position for a suction service valve during normal operation is - ANSWER - any of
the 3
EPR valves are also referred to as ____ valves. - ANSWER - ORI
Refrigeration systems are designed to operate year round. For this reason they are equipped
with - ANSWER - a low ambient control
