Executive Trainee Engineer Interview Questions and Answers

Designing a distribution system for a given peak load

• Determine the peak load and the load profile

• Select the appropriate voltage level for the distribution system

• Choose the type of distribution system (radial, loop, network)

• Determine the location and size of transformers

• Select the appropriate conductor size and type

• Design the protection system

• Consider the future load growth and expansion

• Perform a cost-benefit analysis

Transformer losses are the energy losses that occur in a transformer during its operation. Tests are conducted to measure these losses.

• Transformer losses are categorized into two types: copper losses and iron losses.

• Copper losses occur due to the resistance of the transformer windings and are proportional to the square of the current flowing through them.

• Iron losses occur due to the magnetic properties of the core and are constant regardless of the load on the transformer.

• Tes...read more

Parallel operation of transformers involves connecting two or more transformers with the same voltage ratio and frequency in parallel to increase the power supply capacity.

• Parallel operation is used to increase the power supply capacity and provide redundancy.

• Transformers must have the same voltage ratio and frequency to be connected in parallel.

• Proper synchronization is necessary to avoid circulating currents and voltage imbalances.

• Parallel operation can be achieved using a ...read more

Refrigerators and ACs work on the principle of heat transfer and use refrigerants to absorb and release heat.

• Refrigerants such as Freon are used to absorb heat from the surrounding air or food in the refrigerator.

• The refrigerant then travels through a compressor, which compresses it into a high-pressure gas.

• The high-pressure gas then flows through a condenser, where it releases the absorbed heat to the surrounding air.

• The refrigerant then flows through an expansion valve, whi...read more