10+ 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

Fluid and air pressure measuring calculations

• Understand the units of pressure measurement (psi, bar, kPa, etc.)

• Use pressure gauges and transducers to measure pressure

• Calculate pressure drop in pipes and fittings

• Apply Bernoulli's equation to calculate pressure changes in fluid flow

• Understand the ideal gas law for air pressure calculations

A remote terminal unit (RTU) is a device used to collect data from sensors and equipment in remote locations and transmit it to a central monitoring system.

• RTUs are commonly used in industries such as oil and gas, water treatment, and electricity distribution.

• They are often installed in remote locations where human access is limited or unsafe.

• RTUs can monitor and control various parameters such as temperature, pressure, flow rate, and voltage.

• They typically communicate with a...read more

SCADA is a system for monitoring and controlling industrial processes, while PLC is a device used to control machinery or processes.

• SCADA stands for Supervisory Control and Data Acquisition, used for monitoring and controlling entire industrial processes.

• PLC stands for Programmable Logic Controller, used to control specific machinery or processes.

• SCADA systems typically have a larger scope and are used for centralized monitoring and control, while PLCs are more localized and ...read more

Safety for foods can be ensured through proper handling, storage, and cooking.

• Ensure proper storage temperatures for different types of food

• Use separate cutting boards and utensils for raw and cooked foods

• Cook food to appropriate temperatures to kill harmful bacteria

• Regularly clean and sanitize kitchen surfaces and equipment

• Check expiration dates and discard expired or spoiled food

• Follow food safety guidelines and regulations

• Train employees on proper food handling and safety ...read more