OJT Interview Questions and Answers

First law of Newton states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force. Force is a push or pull on an object that can cause it to accelerate or change direction.

• First law of Newton is also known as the law of inertia

• Force is measured in Newtons (N)

• Examples of force include gravity, friction, and tension

• Force can be represented by vectors, with magnitude and direction

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Types of pumps include centrifugal, reciprocating, and rotary pumps. Heat transfer modes include conduction, convection, and radiation.

• Types of pumps: centrifugal, reciprocating, rotary

• Heat transfer modes: conduction, convection, radiation

• Heat transfer coefficient: measure of how well a material transfers heat

• Mass transfer coefficient: measure of how well a material transfers mass

The driving force of heat and mass transfer is the difference in temperature or concentration between two points.

• Temperature difference drives heat transfer - for example, hot coffee cooling down in a room

• Concentration gradient drives mass transfer - for example, diffusion of perfume in a room

Various types of pumps and valves are used in industries for different applications.

• Types of pumps: centrifugal pumps, positive displacement pumps, diaphragm pumps, gear pumps

• Types of valves: gate valves, globe valves, ball valves, butterfly valves

• Pumps and valves are used in industries such as oil and gas, water treatment, chemical processing

• Each type of pump and valve has specific characteristics and applications