Indian Oil Corporation Apprenticeship Trainee Interview Questions and Answers

My favourite subject is mathematics because I enjoy solving complex problems and seeing how numbers and formulas can be applied in real-life situations.

• I enjoy the challenge of solving equations and puzzles in mathematics

• I like how mathematics can be used in various fields such as engineering, finance, and science

• I find satisfaction in understanding mathematical concepts and applying them to solve practical problems

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

• Energy is conserved in a system

• Energy can be transferred between different forms (e.g. heat, work)

• The total energy of a closed system remains constant

• Mathematically expressed as: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system

Net heat is not equal to net work done in most cases, as they represent different forms of energy transfer.

• Net heat is the transfer of thermal energy between systems due to a temperature difference.

• Net work done is the transfer of mechanical energy between systems due to a force acting over a distance.

• In many real-world scenarios, the net heat and net work done are not equal due to inefficiencies and losses.

• For example...read more

Convection is the transfer of heat through a fluid (liquid or gas) by the movement of the fluid itself.

• Convection occurs when a fluid is heated, becomes less dense, and rises, carrying heat with it.

• Cooler fluid then moves in to take its place, creating a continuous cycle of heat transfer.

• Examples include boiling water in a pot and the movement of air in a room heated by a radiator.

Pascal's laws state that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.

• Pressure applied to a confined fluid is transmitted equally in all directions.

• The pressure at any point in a fluid is the same in all directions.

• Examples include hydraulic systems and car brakes that utilize Pascal's laws to function effectively.

Mass transfer and heat transfer are processes that involve the movement of material and energy, respectively, from one place to another.

• Mass transfer involves the movement of substances from one phase to another, such as in distillation or absorption processes.

• Heat transfer is the process of energy moving from a hotter object to a cooler one, such as in conduction, convection, or radiation.

• Boiling point is the temperat...read more

Auto transformer is a type of transformer that has a single winding, while a transformer has separate primary and secondary windings.

• Auto transformer has a single winding, while transformer has separate primary and secondary windings.

• Auto transformer has a common portion of winding shared by both primary and secondary circuits.

• Auto transformer is smaller in size and lighter in weight compared to transformer.

• Auto transf...read more

Conditions for parallel operations of transformers

• Transformers must have the same voltage ratio and phase sequence

• The transformers must have the same impedance and reactance

• The transformers must be connected to the same busbar

• The transformers must have the same vector group

• The transformers must have the same tap changer characteristics