Interview Questions and Answers

Refrigeration system is a process of removing heat from a space or substance and maintaining a low temperature.

• Types of refrigeration systems include vapor compression, absorption, and gas cycle.

• Refrigerants commonly used are R-22, R-134a, and R-410A.

• Pros of refrigeration systems include preservation of food and medicine, air conditioning, and industrial processes.

• Cons include environmental impact due to refrigerant leakage and energy consumption.

Boilers are vessels that generate steam by heating water. There are various types of boilers with different working procedures and safety norms.

• Types of boilers include fire-tube, water-tube, electric, and biomass boilers

• Boilers work by heating water to produce steam, which is then used for various applications

• Safety norms include regular maintenance, proper ventilation, and adherence to safety codes and regulations

• Examples of safety features include pressure relief valves, w...read more

Different types of pumps are used for different applications. Pump selection criteria depend on factors like flow rate, head, viscosity, etc.

• Centrifugal pumps are used for low viscosity fluids and high flow rates

• Positive displacement pumps are used for high viscosity fluids and low flow rates

• Factors like flow rate, head, viscosity, temperature, pressure, etc. are considered while selecting a pump

• For example, a centrifugal pump may be selected for a cooling water application, ...read more

Cooling towers are heat rejection devices used in HVAC systems to remove heat from the water-cooled system.

• Types of cooling towers include natural draft, mechanical draft, and hybrid.

• Cooling towers are used in power plants, chemical plants, and HVAC systems.

• Cooling performance calculation involves determining the heat load, water flow rate, and temperature difference.

• Factors affecting cooling tower performance include air temperature, humidity, and wind speed.

• Regular maintena...read more

Types of welding include arc welding, gas welding, and resistance welding.

• Arc welding uses an electric arc to create heat and join metals, commonly used in construction and fabrication.

• Gas welding involves the use of a fuel gas and oxygen to create a flame for melting and joining metals, commonly used in automotive repairs.

• Resistance welding uses the application of pressure and electric current to join metals, commonly used in the automotive and aerospace industries.

• Each type...read more