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
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