HVAC Quiz Chapter 21,22,23, and 24 Exam Questions And Answers 100% Pass
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Course
HVAC
Institution
HVAC
HVAC Quiz Chapter 21,22,23, and 24 Exam
Questions And Answers 100% Pass
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 ____. - answerrefrigeration
The household refrigerator fresh-food com...
HVAC Quiz Chapter 21,22,23, and 24 Exam
Questions And Answers 100% Pass
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
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
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
____ 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 refrigerant in a condenser in a refrigeration system ____. - answer✔rejects heat
The condenser in a refrigeration system ____. - answer✔desuperheats the vapor from the
compressor
condenses the vapor from the compressor
subcools the liquid refrigerant before it leaves the condenser
A normally operating water-cooled condenser is operating with a 10° differential between water
in and water out. If scale forms on the water tubes and the entering water is 85°F, which of the
following is possible? - answer✔The outlet water temperature will be lower than expected.
The system head pressure will rise.
Mineral deposits in the water portion of a water-cooled condenser act as ____. - answer✔an
insulator
In a water-cooled condenser with dirty condenser tubes, the temperature difference between the
refrigerant and the leaving water will be ____ when the tubes are clean. - answer✔greater than
The shell-and-tube condenser is cleaned ____. - answer✔with a brush after removing the end
caps
What can be used to maintain the head pressure of a system with a water-cooled condenser? -
answer✔water regulating valve
A normally operating water-cooled condenser is operating with a 10° differential between water
in and water out. If the amount of 85°F water going through the condenser is reduced, which of
the following is a possible temperature of the water leaving the condenser? - answer✔105°F
If an R-12 refrigeration system has its air-cooled condensing unit on a 100°F roof and the
condenser outlet temperature (refrigerant) is 115°F, with how much subcooling is the condenser
operating? - answer✔15°F
Condensing temperatures in an air-cooled condensing unit can be reduced by ____. -
answer✔increasing the condensing surface area
increasing the cfm through the condenser
decreasing the temperature of the air entering the condenser
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