NACL Industries Graduate Engineer Trainee (Get) Interview Questions and Answers

Pumps: centrifugal, positive displacement, axial flow. Compressors: reciprocating, rotary, centrifugal.

• Centrifugal pumps use a rotating impeller to move fluid.

• Positive displacement pumps move fluid by trapping a fixed amount and forcing it through the discharge.

• Axial flow pumps use propellers to move fluid.

• Reciprocating compressors use pistons to compress gas.

• Rotary compressors use rotating screws or vanes to compress ...read more

Characteristic curve of a pump shows the relationship between flow rate and head developed by the pump.

• It is a graph plotted between flow rate and head developed by the pump.

• It helps in determining the efficiency of the pump.

• The curve is obtained by conducting experiments on the pump.

• It is used to select the appropriate pump for a given application.

Shutoff pressure is the maximum pressure a pump can generate when it is not pumping any fluid.

• Shutoff pressure is also known as deadhead pressure.

• It is the pressure at which the pump can no longer move any fluid.

• It is important to know the shutoff pressure to prevent damage to the pump and system.

• For example, if the shutoff pressure of a pump is 100 psi, the pump will stop generating flow when the pressure in the syste

Types of columns and their selection criteria for engineering projects.

• Types of columns include steel, concrete, timber, and composite columns.

• Selection criteria depend on factors such as load capacity, material availability, and cost.

• For example, steel columns are often used in high-rise buildings due to their strength and durability.

• Concrete columns are preferred for their fire resistance and low maintenance.

• Timber c...read more

Design of column, heat exchanger, and centrifugal pump involves various factors such as fluid properties, operating conditions, and material selection.

• Column design involves determining the column diameter, height, and packing material based on the required separation efficiency and pressure drop.

• Heat exchanger design involves selecting the appropriate type of exchanger, determining the heat transfer area, and selectin...read more

Joule-Thomson coefficient is the change in temperature of a gas when it is allowed to expand or contract without any work being done.

• It is a measure of the rate of change of temperature with respect to pressure at constant enthalpy.

• It is used in cryogenic technology to determine the cooling effect of a gas when it expands through a valve or porous plug.

• The coefficient can be positive or negative depending on the gas an...read more

Refrigeration cycle is a thermodynamic process used in refrigerators and air conditioners to transfer heat from a low-temperature region to a high-temperature region.

• The cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant is compressed by the compressor and then condensed in the condenser, releasing heat to the surroundings.

• The high-pressure liquid refrigerant ...read more

Herbicide is a type of pesticide used to kill unwanted plants.

• Herbicides are chemicals that are used to control or kill unwanted plants.

• They are commonly used in agriculture to prevent weeds from competing with crops.

• Some herbicides are selective, meaning they only target specific types of plants, while others are non-selective and will kill any plant they come into contact with.

• Examples of herbicides include glyphosat...read more

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Bernoulli's theorem explains the relationship between fluid speed and pressure.

• Bernoulli's theorem states that as the speed of a fluid increases, its pressure decreases.

• It is important in industries such as aviation, where it is used to design wings and airfoils.

• It is also used in the design of pipelines and pumps.

• Limitations include the assumption of incompressible and non-viscous fluids, and the neglect of friction a...read more

Pump is used to transfer fluids from one place to another while compressor is used to compress gases.

• Pump is used to move fluids like water, oil, etc. from one place to another.

• Compressor is used to compress gases like air, refrigerant, etc.

• Pumps are used in industries, households, and agriculture while compressors are used in refrigeration, air conditioning, and gas pipelines.

• Pumps have a lower pressure ratio while co...read more

Closing a shutoff valve while the pump is running dry can cause damage to the pump and other components.

• The pump will continue to run but without any fluid to circulate, causing it to overheat and potentially seize.

• The lack of fluid can also cause damage to the impeller and other internal components.

• The pressure in the system can also increase, leading to potential leaks or bursts in the pipeline.

• It is important to ens...read more

Closing the shutoff valve while pumping in a centrifugal pump can cause damage to the pump and the piping system.

• The pump will continue to generate pressure, leading to a buildup of pressure in the piping system.

• This can cause the pump to overheat and potentially damage the impeller.

• The piping system may also experience damage due to the increased pressure.

• It is important to ensure that the shutoff valve is only closed...read more

Connecting pumps in series increases head while connecting in parallel increases flow rate.

• Connecting pumps in series increases the total head of the system while connecting in parallel increases the total flow rate.

• In series connection, the discharge remains the same while the head increases.

• In parallel connection, the head remains the same while the discharge increases.

• Series connection is used when high head is requ...read more

Dimensions of power, energy, force and acceleration.

• Power is measured in watts (W) and is the rate at which work is done.

• Energy is measured in joules (J) and is the capacity to do work.

• Force is measured in newtons (N) and is the push or pull on an object.

• Acceleration is measured in meters per second squared (m/s^2) and is the rate of change of velocity.

Valves are mechanical devices used to control the flow of fluids or gases.

• Valves are used in various industries such as oil and gas, water treatment, and chemical processing.

• They can be classified into different types such as gate valves, ball valves, and butterfly valves.

• Valves can be operated manually or automatically using actuators.

• They play a crucial role in maintaining the safety and efficiency of industrial proc...read more

Types of what? Please provide more context.

• Please provide more context for the question.

• Without context, it is impossible to provide a meaningful answer.

• Types can refer to many different things, such as types of engineering, types of materials, types of software, etc.