Transmission Corporation Of Andhrapradesh
10+ nVent Interview Questions and Answers
Q1. Are you familiar with the different varieties of wires used in transmission?
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 ACSR (Aluminum Conductor Steel Reinforced) and AAC (All A...read more
Q2. What are the defferent b/w nutral wire and earth wire
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 electrical panel
Earth wire is connected to the grounding e...read more
Q3. Can you mention a few differences between a fuse and a breaker
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 ground fault circuit interrupters (GFCI)
Q4. How many types are there in solar panel installation
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 depending on the type of roof or ground surface.
Q5. What types of maintenance equipment in transformer
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 transformer
Bushings and tap changers for regular maintenance ...read more
Q6. Transformers in two windings primary and secondary
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, distribution transformers
Q7. How to maintenance transformer
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 reference
Q8. What is use of busbar
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 choice for power distribution.
They are also used in electrical...read more
Q9. How to use transformer
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
Q10. Transformers in oile use
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
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