Transmission Corporation Of Andhrapradesh Diploma Electrical Engineer Interview Questions, Process, and Tips

Transformers have two windings, primary and secondary, which are used to transfer electrical energy from one circuit to another.

• Primary winding receives electrical energy from the source

• Secondary winding transfers the electrical energy to the load

• The ratio of turns in the primary and secondary windings determines the voltage transformation

• Transformers can step up or step down voltage levels

• Examples: power transformers,

Transformers in oil are used for insulation and cooling purposes.

• Oil acts as an insulating medium to prevent electrical breakdown

• Oil also helps in dissipating heat generated during operation

• Commonly used oils include mineral oil, silicone oil, and vegetable oil

Transformers are used to step up or step down voltage levels in electrical circuits.

• Transformers consist of primary and secondary coils wound around a core

• Step-up transformers increase voltage levels, while step-down transformers decrease voltage levels

• Transformers work on the principle of electromagnetic induction

• They are used in power distribution systems, electrical appliances, and electronic devices

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