OPTCL Diploma Electrical Engineer Interview Questions and Answers

The neutral wire carries current back to the source, while the earth wire provides a path for electrical faults to safely discharge.

• Neutral wire carries current back to the source

• Earth wire provides a path for electrical faults to safely discharge

• Neutral wire is typically colored white or gray

• Earth wire is typically colored green or green with yellow stripes

• Neutral wire is connected to the grounding system at the main ...read more

There are mainly two types of solar panel installation: On-grid and Off-grid.

• On-grid installation is connected to the main power grid and excess energy can be sold back to the utility company.

• Off-grid installation is not connected to the main power grid and requires battery storage to store excess energy.

• Other types include ground-mounted, roof-mounted, and pole-mounted installations.

• Installation methods can also vary

Transformer maintenance involves regular inspection, cleaning, and testing to ensure optimal performance and prevent breakdowns.

• Inspect transformer for signs of damage or wear

• Clean transformer components and cooling system

• Test transformer insulation and oil quality

• Replace worn or damaged parts as needed

• Perform regular maintenance according to manufacturer guidelines

• Keep records of maintenance and repairs for future ref

Busbars are used to conduct large currents of electricity in a safe and efficient manner.

• Busbars are made of copper or aluminum and are used to distribute power throughout a building or facility.

• They are often used in switchgear and distribution panels to connect circuit breakers and other electrical equipment.

• Busbars can handle high levels of current without overheating or melting, making them a reliable and safe choi...read more

Maintenance equipment for transformers include oil filtration systems, temperature sensors, and insulation testers.

• Oil filtration systems to remove impurities and extend the life of transformer oil

• Temperature sensors to monitor the temperature of the transformer and prevent overheating

• Insulation testers to check the insulation resistance of the transformer

• Dissolved gas analysis equipment to detect any faults in the tra...read more

A fuse is a one-time use device that melts when overloaded while a breaker can be reset and reused.

• A fuse needs to be replaced after it melts while a breaker can be reset

• A fuse is cheaper than a breaker

• A fuse reacts faster to overloads than a breaker

• A breaker can handle higher current loads than a fuse

• Examples of fuses include glass tube fuses and cartridge fuses while examples of breakers include thermal-magnetic and

Yes, there are different types of wires used in transmission.

• The most common types of wires used in transmission are copper, aluminum, and steel-cored aluminum.

• Copper wires are the most efficient and expensive, while aluminum wires are less efficient but more affordable.

• Steel-cored aluminum wires are used for long-distance transmission as they have high tensile strength.

• Other types of wires used in transmission include...read more