Voltas 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,...read more

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.

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.

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 ...read more