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

• Fo...read more

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

Steelmaking is the process of producing steel from iron ore and/or scrap metal through various methods such as blast furnaces or electric arc furnaces.

• Iron ore is first mined and then processed to remove impurities.

• The purified iron ore is then combined with coal and limestone in a blast furnace to create molten iron.

• The molten iron is further processed to remove impurities and adjust the carbon content to create steel.

• Alternatively, scrap metal can be melted in an electric a...read more

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

There are three main modes of heat transfer: conduction, convection, and radiation.

• Conduction: Heat transfer through direct contact between particles. Example: Touching a hot stove.

• Convection: Heat transfer through the movement of fluids (liquids or gases). Example: Boiling water.

• Radiation: Heat transfer through electromagnetic waves. Example: Sunlight warming the Earth.

Thermodynamics laws govern energy transfer and transformation in physical systems.

• First law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted.

• Second law of thermodynamics states that the entropy of an isolated system always increases over time.

• Third law of thermodynamics states that as temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: A car engine converting fuel into mechanical ...read more