Interview Questions and Answers

Reynolds number is a dimensionless quantity used to predict types of fluid flow.

• Reynolds number is calculated using the fluid velocity, density, viscosity, and characteristic length.

• It predicts whether the flow is laminar, transitional, or turbulent.

• Laminar flow occurs at low Reynolds numbers, while turbulent flow occurs at high Reynolds numbers.

• Transitional flow occurs between laminar and turbulent flow.

• Examples of laminar flow include blood flow in capillaries and flow in s...read more

Pumps are devices used to move fluids from one place to another. There are various types of pumps available.

• Centrifugal pumps

• Positive displacement pumps

• Axial flow pumps

• Mixed flow pumps

• Jet pumps

• Submersible pumps

• Diaphragm pumps

• Gear pumps

• Peristaltic pumps

Heat exchangers are devices that transfer heat between two or more fluids.

• Shell and tube heat exchangers

• Plate heat exchangers

• Double pipe heat exchangers

• Spiral heat exchangers

• Air-cooled heat exchangers

LMTD formula is used to calculate the temperature difference in heat exchangers.

• LMTD stands for Logarithmic Mean Temperature Difference.

• It is used to calculate the temperature difference in heat exchangers.

• The formula is: LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

• ΔT1 and ΔT2 are the temperature differences at the hot and cold ends of the heat exchanger.

• The formula is used to determine the overall heat transfer coefficient and the rate of heat transfer.

• It is important in designing and...read more

Valves are devices used to control the flow of fluids or gases in a system.

• Gate valve

• Ball valve

• Butterfly valve

• Globe valve

• Check valve

• Diaphragm valve

• Needle valve

• Pressure relief valve