Research Engineer / Scientist Interview Questions and Answers

A heat exchanger is a device used to transfer heat between two or more fluids.

• Heat exchangers are commonly used in various industries, such as HVAC, chemical processing, and power generation.

• They can be classified into different types based on their construction and flow arrangement, such as shell and tube, plate, and finned.

• The mass balance equation for a heat exchanger states that the mass flow rate of fluid entering the exchanger is equal to the mass flow rate of fluid exi...read more

The Carnot cycle is a theoretical thermodynamic cycle that describes the most efficient heat engine possible.

• The Carnot cycle consists of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression.

• The efficiency of the Carnot cycle is given by the equation: efficiency = 1 - (Tc/Th), where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.

• The Carnot cycle serves as a benchmark...read more

I.C. Engine is an internal combustion engine that converts chemical energy into mechanical energy. Otto Cycle and Diesel Cycle are two types of I.C. Engines.

• I.C. Engine stands for Internal Combustion Engine.

• It is a type of engine that converts chemical energy into mechanical energy.

• Otto Cycle is a type of I.C. Engine used in gasoline/petrol engines.

• It consists of four strokes: intake, compression, power, and exhaust.

• Diesel Cycle is a type of I.C. Engine used in diesel engines...read more

Bio-diesel is a renewable fuel made from vegetable oils or animal fats. Lubricity is its ability to reduce friction and wear in engines.

• Bio-diesel is a type of fuel that is derived from renewable sources such as vegetable oils or animal fats.

• It is produced through a process called transesterification, where the fats or oils are chemically reacted with an alcohol to form bio-diesel and glycerin.

• Bio-diesel can be used as a substitute for traditional diesel fuel in diesel engine...read more