10+ AC and Refrigeration Technician Interview Questions and Answers

Refrigeration is the process of removing heat from a confined space, while air conditioning involves both cooling and heating of air in a space.

• Refrigeration is mainly focused on removing heat from a space to lower the temperature, typically used in preserving food or creating cold storage.

• Air conditioning involves both cooling and heating of air to maintain a comfortable temperature in a space, commonly used in homes, offices, and vehicles.

• Refrigeration systems typically hav...read more

There are three types of conditioners: air cooler conditioner, water cooler conditioner, and evaporator conditioner.

• Air cooler conditioner is used to cool the air in a room or space.

• Water cooler conditioner is used to cool water for various purposes.

• Evaporator conditioner is a type of air conditioner that uses evaporation to cool the air.

The chemical formula of R134a is C2H2F4.

• R134a is also known as 1,1,1,2-Tetrafluoroethane.

• It is a non-ozone depleting refrigerant commonly used in air conditioning systems.

• The chemical formula C2H2F4 represents the two carbon atoms, two hydrogen atoms, and four fluorine atoms in R134a.

A shell and tube type condenser is a heat exchanger used in HVAC systems to transfer heat from the refrigerant gas to the cooling water or air.

• Consists of a series of tubes through which the refrigerant flows, surrounded by a shell through which the cooling medium flows

• Efficient in transferring heat due to large surface area provided by the tubes

• Commonly used in air conditioning systems and refrigeration units

• Examples include water-cooled condensers in large commercial HVAC s...read more

Air conditioning is a system that cools and dehumidifies indoor air to create a comfortable environment.

• Air conditioning is a technology used to control the temperature, humidity, and air quality in indoor spaces.

• It involves the process of cooling and dehumidifying the air to provide comfort and improve air quality.

• Air conditioning systems typically consist of components such as compressors, condensers, evaporators, and refrigerants.

• Examples of air conditioning systems includ...read more

There are mainly four types of compressors: reciprocating, rotary, scroll, and centrifugal.

• Reciprocating compressors use pistons to compress the refrigerant.

• Rotary compressors use rotating vanes or blades to compress the refrigerant.

• Scroll compressors use two spiral-shaped scrolls to compress the refrigerant.

• Centrifugal compressors use a rotating impeller to compress the refrigerant.

Thermoset is a type of polymer that undergoes a chemical reaction during curing, resulting in a hard and rigid material.

• Thermoset polymers are formed by cross-linking polymer chains through a curing process.

• Once cured, thermoset materials cannot be melted or reshaped.

• Examples of thermoset materials include epoxy, phenolic, and melamine.

• Thermoset materials are commonly used in electrical insulation, automotive parts, and construction materials.

A condenser is a device used in HVAC systems to release heat absorbed by the refrigerant during the cooling process.

• Converts high-pressure gas into high-pressure liquid

• Located outside the building

• Uses a fan to help dissipate heat

• Can be air-cooled or water-cooled

R134 gas is used as a refrigerant in air conditioning and refrigeration systems.

• R134 gas is a type of refrigerant used in AC and refrigeration systems.

• It is a hydrofluorocarbon (HFC) with the chemical formula CF3CH2F.

• R134 gas is non-toxic and non-flammable, making it a safer option for cooling systems.

• It is commonly used as a replacement for R12 refrigerant, which is being phased out due to its ozone-depleting properties.

AC full name in Hindi is 'एयर कंडीशनिंग' (Air Conditioning)

• AC stands for 'Air Conditioning' in English

• In Hindi, AC is translated as 'एयर कंडीशनिंग'

• एयर कंडीशनिंग is commonly used in India to refer to air conditioning systems

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

• Compressors are commonly used in air conditioning and refrigeration systems to circulate refrigerant.

• They work by taking in low-pressure gas and compressing it to a higher pressure.

• There are different types of compressors, such as reciprocating, rotary, and scroll compressors.

• Compressors play a crucial role in the cooling process by transferring heat from inside a space to the outs...read more

Refrigeration cycle is a process in which refrigerant absorbs heat from the indoor air and releases it outside to cool the indoor space.

• Refrigerant absorbs heat from the indoor air through the evaporator coil.

• The refrigerant then flows to the compressor where it is compressed into a high-pressure, high-temperature gas.

• The hot gas then moves to the condenser coil where it releases heat to the outside air and condenses into a liquid.

• The liquid refrigerant then flows back to the...read more

A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle.

• Chillers are commonly used in air conditioning systems to cool buildings or industrial processes.

• They work by transferring heat from the liquid being chilled to a different liquid or to the air.

• Chillers can be air-cooled, water-cooled, or evaporatively cooled.

• Examples of chillers include centrifugal chillers, screw chillers, and absorption chillers.