AC and Refrigeration Technician

20+ AC and Refrigeration Technician Interview Questions and Answers

Updated 7 Feb 2025
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Q1. How many types of refrigerants are used in air conditioning systems?

Ans.

There are several types of refrigerants used in air conditioning systems, each with different properties and environmental impacts.

  • Common refrigerants include R-22, R-410A, and R-134a

  • Refrigerants can be classified as CFCs, HCFCs, HFCs, and natural refrigerants

  • Newer refrigerants like R-32 and R-1234yf are being developed to replace older, more harmful ones

Q2. What is the difference between of refrigeration and air conditioning?

Ans.

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

Q3. What type of air conditioning system do you recommend?

Ans.

I recommend a split system air conditioning system for its efficiency and flexibility.

  • Split system ACs are energy efficient and provide better temperature control.

  • They are versatile and can be installed in different rooms or zones.

  • Split systems are quieter compared to window units.

  • Examples: Mitsubishi Electric split system, Daikin split system.

Q4. Type of the conditioner ? Ans - three. 1- Air cooler conditioner . 2- water cooler conditioner . 3- Evaporator conditioner.

Ans.

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.

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Q5. What is chemical formula of R134a?

Ans.

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.

Q6. What is sell and tube type condenser ?

Ans.

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

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Q7. Would you suggest person to purchase product

Ans.

Yes, I would suggest a person to purchase a product if it meets their needs and is of good quality.

  • Consider the person's specific needs and requirements

  • Ensure the product is of good quality and meets safety standards

  • Provide information on the benefits and features of the product

  • Offer recommendations based on personal experience or expertise

Q8. What is air conditioning

Ans.

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

Q9. Where is Avoprator used?

Ans.

Avoprator is used in air conditioning and refrigeration systems to control the flow of refrigerant.

  • Avoprator is used in air conditioning systems to regulate the flow of refrigerant through the system.

  • It helps in controlling the temperature and pressure of the refrigerant in the system.

  • Avoprator is commonly found in commercial and industrial HVAC systems.

  • Examples of Avoprator brands include Emerson, Danfoss, and Sporlan.

Q10. How many types of compressor?

Ans.

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.

Q11. What is thermoset and

Ans.

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.

Q12. What is condenser

Ans.

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

Q13. R134 gas uses in system?

Ans.

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.

Q14. ac full name in hindi

Ans.

AC full name in Hindi is 'рдПрдпрд░ рдХрдВрдбреАрд╢рдирд┐рдВрдЧ' (Air Conditioning)

  • AC stands for 'Air Conditioning' in English

  • In Hindi, AC is translated as 'рдПрдпрд░ рдХрдВрдбреАрд╢рдирд┐рдВрдЧ'

  • рдПрдпрд░ рдХрдВрдбреАрд╢рдирд┐рдВрдЧ is commonly used in India to refer to air conditioning systems

Q15. Types of refrigerator

Ans.

There are various types of refrigerators available for different needs and preferences.

  • Top freezer refrigerator

  • Bottom freezer refrigerator

  • Side-by-side refrigerator

  • French door refrigerator

  • Compact refrigerator

  • Built-in refrigerator

  • Counter-depth refrigerator

Q16. What is compressor

Ans.

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

Q17. Explain refrigeration cycle

Ans.

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

Q18. Types of compressor

Ans.

Types of compressors include reciprocating, rotary, scroll, and centrifugal.

  • Reciprocating compressors use pistons to compress refrigerant gas.

  • Rotary compressors use rotating vanes or blades to compress gas.

  • Scroll compressors use spiral-shaped scrolls to compress gas.

  • Centrifugal compressors use high-speed rotating impellers to compress gas.

  • Examples: Copeland Scroll Compressor, Danfoss Reciprocating Compressor, Hitachi Rotary Compressor

Q19. Types of condensor

Ans.

Types of condensors include air-cooled, water-cooled, evaporative, and hybrid condensors.

  • Air-cooled condensors use air to remove heat from the refrigerant.

  • Water-cooled condensors use water to remove heat from the refrigerant.

  • Evaporative condensors use a combination of air and water to remove heat from the refrigerant.

  • Hybrid condensors combine features of air-cooled and water-cooled condensors.

Q20. Explaine chiller

Ans.

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.

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