Commercial and Domestic Refrigeration Questions and Answers (Graded A)
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Module
Commercial and Domestic Refrigeration
Institution
Commercial And Domestic Refrigeration
Commercial and Domestic Refrigeration Questions and Answers (Graded A)Commercial and Domestic Refrigeration Questions and Answers (Graded A)Commercial and Domestic Refrigeration Questions and Answers (Graded A)Commercial and Domestic Refrigeration Questions and Answers (Graded A)
Low-temperature f...
commercial and domestic refrigeration questions an
commercial and domestic refrigeration questions
low temperature food storage applications general
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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
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