BARC Interview Questions, Process, and Tips

The Hagen-Poiseuille equation describes the flow of a viscous fluid through a cylindrical pipe or tube.

• The equation relates the flow rate of the fluid to the pressure difference, viscosity, length, and radius of the pipe.

• It can be used to calculate the flow rate or pressure drop in various fluid systems, such as blood flow in blood vessels or water flow in pipes.

• The equation assumes laminar flow, where the fluid flows ...read more

Bernoulli's equation relates the pressure, velocity, and height of a fluid in motion.

• The equation is based on the conservation of energy principle.

• It is commonly used in fluid mechanics to analyze the flow of fluids through pipes and over surfaces.

• The equation assumes that the fluid is incompressible, non-viscous, and steady-state.

• It also assumes that the flow is laminar and that there is no heat transfer or work done ...read more

Pump characteristic curves show the relationship between flow rate, head, and power.

• Pump characteristic curves depict the performance of a pump under different operating conditions.

• The curves show the relationship between flow rate (Q), head (H), and power (P).

• The curves help in selecting the right pump for a specific application.

• The curves can be used to determine the efficiency and operating range of a pump.

• Different...read more

Valves are used to control fluid flow. Different types include gate, globe, ball, butterfly, and needle valves.

• Gate valves: used for full open or full close control

• Globe valves: used for throttling control

• Ball valves: used for quick shut-off control

• Butterfly valves: used for low-pressure control

• Needle valves: used for precise flow control

• Other types include diaphragm, pinch, and check valves

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

• Types of heat exchangers include shell and tube, plate, and finned tube heat exchangers.

• Selection criteria for heat exchangers include heat transfer efficiency, pressure drop, material compatibility, and cost.

• Shell and tube heat exchangers are commonly used in industries such as oil and gas, chemical, and power generation.

• Plate heat exchangers...read more

A design methodology for a heat exchanger involves several steps and considerations.

• Identify the heat transfer requirements and constraints

• Determine the type and size of heat exchanger suitable for the application

• Select the appropriate materials for construction

• Calculate the required surface area for heat transfer

• Design the flow arrangement and determine the fluid flow rates

• Consider pressure drop and fouling factors

• Per...read more

In a co-current heat exchanger, the hot and cold fluids flow in the same direction, resulting in a gradual decrease in temperature. In a counter current heat exchanger, the fluids flow in opposite directions, leading to a more efficient heat transfer.

• Co-current heat exchanger: gradual decrease in temperature

• Counter current heat exchanger: more efficient heat transfer

• Co-current: hot and cold fluids flow in the same dire...read more

Velocity profiles inside pipeline and boundary layer formations

• Velocity profiles inside a pipeline refer to the distribution of fluid velocities across the cross-section of the pipe.

• Boundary layer formations occur when fluid flows over a solid surface, creating a thin layer of fluid near the surface with different velocity characteristics.

• Velocity profiles inside a pipeline can be influenced by factors such as pipe dia...read more

The various phases in heating liquid are solid, liquid, and gas.

• Heating a solid substance causes it to melt and become a liquid.

• Continued heating of the liquid causes it to evaporate and become a gas.

• Examples include heating ice to form water and then heating water to form steam.

The McCabe Thiele method is a graphical technique used to analyze binary distillation processes.

• Assumes constant molar overflow

• Assumes constant relative volatility

• Assumes ideal behavior of the components

• Assumes equilibrium between liquid and vapor phases

• Assumes constant molar flow rates

• Assumes constant temperature and pressure

A daily used CSTR type equipment in kitchen is a pressure cooker.

• Pressure cookers are used to cook food quickly and efficiently.

• They work by trapping steam inside the pot, which raises the pressure and temperature.

• This allows food to cook faster and retain more nutrients.

• Examples of dishes that can be made in a pressure cooker include soups, stews, and rice.

• Pressure cookers come in different sizes and materials, such a