WorksheetsREFRIGERATOR AND AIR-CONDITIONING
Total questions: 32
Worksheet time: 16mins
What is the primary function of a refrigeration system?
To generate heat
To remove heat from a designated area
To increase humidity
To purify air
What is the function of Expansion Valve
Convert High pressure liquid in to a low pressure gas
Convert low pressure liquid in to a high pressure gas
Which refrigerant is commonly used in domestic refrigerators?
R-22 (chlorodifluoromethane)
R-134a (tetrafluoroethane)
Ammonia ( NH3)
CO2
The Coefficient of Performance (COP) is defined as:
The ratio of heat removed to work input
The ratio of work input to heat removed
The efficiency of the compressor
The amount of refrigerant used
In a vapor compression refrigeration cycle, which component is responsible for compressing the refrigerant?
Evaporator
Condenser
Expansion valve
Compressor
What happens to the refrigerant in the evaporator?
It condenses into liquid
It absorbs heat and evaporates
It is compressed into high pressure
It is cooled and stored
Which of the following secondary refrigerant?
R-12
Ammonia
Water & Brine Solution
R-22
Where does the lowest occur in cycle? a vapour temperature compression
Condenser
Evaporator
Compressor
Expansion valve
When the high vapor release it's turn to a liquid
Condenser
Evaporator
Compressor
Expansion valve
Dropping of temperature
Condenser
Evaporator
Compressor
Expansion valve
In air conditioning, what does the term "sensible heat" refer to?
Heat that causes a change in temperature without changing moisture content
Heat that causes a change in moisture content only
Heat that is felt but not measured
Heat that causes a change in state from liquid to vapor
What is the purpose of the condenser in a refrigeration system?
To absorb heat from the environment
To release heat to the environment
To compress refrigerant vapor
To expand refrigerant liquid
Which law governs the behavior of gases in refrigeration cycles?
Newton's Law
Boyle's Law
Ohm's Law
Hooke's Law
What does an expansion valve do in a refrigeration system?
Increases pressure of the refrigerant
Decreases pressure and temperature of the refrigerant
Compresses refrigerant gas
Heats up the refrigerant
Which type of air conditioning system uses ducts to distribute air?
Split AC
Window AC
Central AC
Portable AC
What is "latent heat" in the context of refrigeration?
Heat required to change temperature
Heat required to change state without changing temperature
Heat lost during condensation
Heat gained during evaporation
The process of removing moisture from air is known as:
Humidification
Dehumidification
Sensible cooling
Refrigeration
What does R-value represent in insulation materials?
Resistance to heat flow
Rate of cooling
Refrigeration capacity
Airflow resistance
In HVAC systems, what does "HVAC" stand for?
Heating, Ventilation, and Air Conditioning
Heating, Vacuum, and Air Conditioning
High Velocity Air Conditioning
Heating, Ventilation, and Acoustics
The unit of measurement for refrigeration capacity is:
BTU/hr(British Thermal Unit)
Joules/sec
Watts/m²
Kilowatts/hr
What does "psychrometrics" study mean?
The behavior of gases under pressure
The properties of moist air
The efficiency of compressors
The thermal conductivity of materials
In which part of an air conditioning system does phase change occur from liquid to vapor?
Condenser
Evaporator
Compressor
Expansion valve
Which type of air conditioning unit is typically installed through a wall opening?
Central AC
Split AC
Window AC
Portable AC
What happens during the condensation process in refrigeration?
Refrigerant absorbs heat and evaporates
Refrigerant freezes into solid form
Refrigerant expands and cools down
Refrigerant releases heat and changes from vapor to liquid
Which component helps maintain airflow in an HVAC system?
Filter
Compressor
Expansion valve
Condenser
In air conditioning terminology, what does "dew point" refer to?
Temperature at which air can hold maximum moisture
Temperature at which condensation begins
Temperature at which air becomes saturated with moisture
All of the above
What type of refrigerant is ammonia classified as?
Primary refrigerant
Secondary refrigerant
Natural refrigerant
Synthetic refrigerant
What is one disadvantage of using R-22 as a refrigerant?
High efficiency
Ozone depletion potential
Low cost
Non-toxic nature
In HVAC systems, what does "ventilation" refer to?
Cooling indoor air pollution
Heating outdoor air
Circulating fresh outdoor air into indoor spaces
Reducing humidity levels
During which process does water vapor condense into liquid water?
Humidification
Dehumidification
Sensible heating
Sensible cooling
Which component acts as a barrier between high-pressure and low-pressure sides in refrigeration systems?
Evaporator
Condenser
Expansion valve
Compressor
The vapour pressure of refrigerant should be
Lower than atmospheric pressure
Higher than atmospheric pressure
Equal to atmospheric pressure
Could be anything
