#1
Which of the following is a commonly used refrigerant in household refrigerators and air conditioners?
Carbon Dioxide (CO2)
R-134a
R-717 (Ammonia)
R-410A
#2
What is the purpose of an evaporator in a refrigeration system?
To increase the pressure of the refrigerant
To remove heat from the space being cooled
To control the flow of refrigerant
To compress the refrigerant
#3
Which refrigerant is known for its low environmental impact and is commonly used as a replacement for R-22?
#4
What component of a refrigeration system is responsible for controlling the flow of refrigerant between the evaporator and the condenser?
Expansion valve
Compressor
Condenser coil
Evaporator fan
#5
Which of the following refrigerants has a lower global warming potential (GWP)?
R-134a
R-290 (Propane)
R-404A
R-22
#6
In a refrigeration cycle, what is the purpose of the compressor?
To remove heat from the refrigerant
To increase the pressure of the refrigerant
To control the flow of refrigerant
To convert the refrigerant from vapor to liquid
#7
Which of the following statements about refrigerants is true?
All refrigerants are non-toxic and safe for human exposure.
Refrigerants with higher ozone depletion potential (ODP) are preferred for environmental reasons.
Refrigerants with lower global warming potential (GWP) are preferred for environmental reasons.
Refrigerants do not contribute to climate change.
#8
Which law of thermodynamics is primarily associated with refrigeration systems?
Zeroth Law
First Law
Second Law
Third Law
#9
What is the function of a condenser in a refrigeration cycle?
To remove moisture from the refrigerant
To convert the refrigerant from vapor to liquid
To regulate the flow of refrigerant
To increase the temperature of the refrigerant
#10
What type of refrigerant does not deplete the ozone layer but contributes to global warming?
HFCs (Hydrofluorocarbons)
HCFCs (Hydrochlorofluorocarbons)
CFCs (Chlorofluorocarbons)
Ammonia (R-717)
#11
In a refrigeration system, what does the term 'superheat' refer to?
The temperature difference between the refrigerant and the surrounding air
The increase in pressure across the condenser
The temperature increase of the refrigerant vapor above its boiling point
The amount of heat absorbed by the evaporator coil
#12
Which refrigerant is commonly used in large industrial refrigeration systems due to its high efficiency and low cost?
R-717 (Ammonia)
R-32
R-410A
R-134a
#13
What is the primary function of an expansion valve in a refrigeration system?
To increase the temperature of the refrigerant
To decrease the pressure of the refrigerant
To regulate the flow of refrigerant into the evaporator
To convert the refrigerant from liquid to vapor
#14
Which of the following refrigerants is classified as a natural refrigerant?
R-410A
R-134a
R-717 (Ammonia)
R-404A
#15
What does the coefficient of performance (COP) measure in a refrigeration system?
The amount of work input required
The rate of heat transfer
The efficiency of the refrigeration cycle
The pressure difference across the compressor
#16
What is the purpose of an accumulator in a refrigeration system?
To store excess refrigerant during low load conditions
To regulate the flow of refrigerant into the evaporator
To prevent liquid refrigerant from entering the compressor
To increase the efficiency of the condenser
#17
What phenomenon occurs when refrigerant absorbs heat from the surroundings and changes from a liquid to a vapor?
Subcooling
Superheating
Condensation
Evaporation
#18
In a refrigeration cycle, which component is responsible for removing heat from the refrigerant?
Condenser
Compressor
Evaporator
Expansion valve
#19
Which refrigerant has been widely adopted as a replacement for R-22 due to its lower ozone depletion potential?