Chapter 11 - Basic Cycle Quiz Flashcards
Which refrigeration system component absorbs heat from where it is unwanted?
Compressor
Condenser
Evaporator
Liquid line
evaporator
The normal amount of superheat at the evaporator outlet is ____ degrees Fahrenheit.
0
10
45
80
10
Refrigerant inside the evaporator tubing is in which of the following saturated condition?
Low-temperature, low-pressure
Low-temperature, high-pressure
High-temperature, low-pressure
High-temperature, high-pressure
low temperature, low pressure
Which component of the refrigerant system connects the evaporator outlet to the compressor intake?
Hot-gas discharge line
Liquid line
Condensing line
Suction line
suction line
The condenser is a heat exchanger, which is designed to ____ heat.
absorb
add
release
soak up
release
Evaporators operate on the principles of conduction and ____.
convection
dissipation
radiation
thermodynamics
convection
Which of the following types of evaporators is commonly used in chest-type domestic freezers?
Plate-type
Shelf-type
Shell-type
Wall-type
wall-type
Which of the following types of evaporators is the most widely used in domestic, commercial, and industrial applications?
Finned-tube-type
Plate-type
Shell-type
Wall-type
finned-tube-type
Which of the following is not one of the three basic types of compressors?
Closed
Hermetic
Open
Semihermetic
closed
To achieve proper condenser operation, the compressor must increase the refrigerant pressure to a saturation temperature ____ degrees Fahrenheit higher than the ambient air entering the condenser.
1 to 5
8 to 15
30 to 35
75 to 80
30 to 50
All of the following are the types of air-cooled condensers commonly used in domestic refrigeration, except for which one?
Finned-tube
Plate-type
Wall static
Wire static
plate type
For commercial application, the ____ convection condenser is generally preferred.
forced
natural
normal
standard
forced
Makeup water is necessary, because cooling towers evaporate about ____ gallons of water every hour for each ton of refrigeration.
0.5
2
5
10
2
A refrigeration system is turned on when the rising air temperature reaches the ____ point of the air-sensitive thermostat.
cut-in
cut-out
pressure drop
safety relief
cut-in
The mail objective of the condenser operation is to have all refrigerant in ____ form in the final pass of the condenser tubing.
gas
liquid
solid
vapor
liquid
Suctions lines are insulated for the following reasons, except to ____.
limit superheating of suction line gas
prevent condensation and frost on the suction line
prevent reduced compressor efficiency
short-cycle the system
short-cycle the system
The evaporator temperature difference only exists when the system is in the on cycle.
True
False
true
In the basic refrigeration cycle, the circulating refrigerant absorbs unwanted heat at one location and carries it to another location where it will be released.
True False
true
When the temperature of the incoming air reaches the desired lower temperature level, the thermostat turns off the evaporator fan.
True False
false
The refrigerant being discharged by the compressor is in the form of a low-pressure, low-temperature gas.
True False
false
The condenser is designed to absorb heat.
True False
false
The shell-type evaporator was commonly used as the freezing compartment in domestic refrigerators that had automatic defrost.
True False
false
A very long suction line or one with many bends or fittings will lead to a pressure increase.
True False
false
The compressor is the “heart” of the refrigeration system.
True False
true
