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10+ Flynaut Interview Questions and Answers

Updated 3 Mar 2024

Q1. What should be the tan Delta value of electrical equipment (for example T/F).

Ans.

The tan Delta value of electrical equipment should be as low as possible.

  • Tan Delta is a measure of the dielectric losses in electrical equipment.

  • A low tan Delta value indicates that the equipment has good insulation properties.

  • The tan Delta value can be affected by factors such as temperature, moisture, and aging of the equipment.

  • For transformers, a typical tan Delta value is around 0.001 or lower.

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Q2. What is the ground clearance of 400KV transmission line.

Ans.

The ground clearance of a 400KV transmission line varies depending on various factors.

  • The ground clearance of a transmission line is the vertical distance between the lowest point of the conductor and the ground.

  • The ground clearance is determined based on safety regulations and requirements.

  • Factors that influence the ground clearance include terrain, vegetation, and proximity to buildings or roads.

  • In hilly areas, the ground clearance may be higher to account for uneven terrai...read more

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Q3. Why transformer are rated in KVA.

Ans.

Transformers are rated in KVA because it represents the apparent power they can handle.

  • KVA stands for kilovolt-ampere, which is a unit of apparent power.

  • Transformers are designed to handle a certain amount of power, and the KVA rating indicates their capacity.

  • The KVA rating takes into account both the voltage and current that the transformer can handle.

  • It helps in determining the appropriate size and capacity of the transformer for a given application.

  • For example, a transform...read more

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Q4. The SF6 gas used for Ckt breaker chamber should be how much bar.

Ans.

The SF6 gas used for Ckt breaker chamber should be maintained at a pressure of around 5-7 bar.

  • The SF6 gas in the circuit breaker chamber should be maintained at a specific pressure to ensure proper functioning.

  • The recommended pressure for SF6 gas in the circuit breaker chamber is typically between 5 and 7 bar.

  • Maintaining the correct pressure helps in extinguishing the arc during circuit interruption.

  • Too low or too high pressure can affect the performance and reliability of th...read more

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Q5. The Basis setting of REF protectionfor transformer should be how much.

Ans.

The Basis setting of REF protection for a transformer should be determined based on the transformer's characteristics and the system requirements.

  • The basis setting of REF (Restricted Earth Fault) protection for a transformer is typically determined by considering the transformer's winding configuration, impedance, and the system's fault level.

  • The setting should be chosen to ensure that the protection operates reliably for internal faults while avoiding unnecessary tripping fo...read more

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Q6. Why ACSRinvar conductor are widely used in metro principal city.

Ans.

ACSRinvar conductors are widely used in metro principal cities due to their high strength and low thermal expansion.

  • ACSRinvar conductors have a high tensile strength, making them suitable for long-distance transmission lines in metro cities.

  • They have a low coefficient of thermal expansion, which helps in reducing sagging of the conductors and maintaining power transmission efficiency.

  • The use of ACSRinvar conductors in metro principal cities ensures reliable and uninterrupted ...read more

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Q7. What are the main difference between AIS and GIS Substation.

Ans.

AIS and GIS substations differ in their construction and insulation methods.

  • AIS (Air Insulated Substation) uses air as the insulation medium, while GIS (Gas Insulated Substation) uses SF6 gas.

  • AIS substations require larger land areas compared to GIS substations.

  • GIS substations are more compact and can be installed in urban areas where space is limited.

  • AIS substations are more susceptible to environmental factors like pollution and weather conditions.

  • GIS substations offer high...read more

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Q8. Why star star zero phase shift transformer winding are used.

Ans.

Star-star zero phase shift transformer windings are used to provide a balanced three-phase output with zero phase shift between primary and secondary voltages.

  • Star-star zero phase shift transformer windings are commonly used in power distribution systems.

  • They are used to supply power to three-phase loads such as motors, generators, and transformers.

  • The windings are designed in such a way that the voltages in the primary and secondary sides are in phase with each other.

  • This co...read more

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Q9. Why vibration damper are used with Conductor.

Ans.

Vibration dampers are used with conductors to reduce the risk of fatigue failure and damage caused by wind-induced vibrations.

  • Vibration dampers absorb and dissipate the energy generated by wind-induced vibrations in conductors.

  • They help to reduce the risk of fatigue failure and damage to the conductor and associated hardware.

  • Vibration dampers are typically installed at regular intervals along the length of the conductor.

  • They can be in the form of spiral-shaped devices, weight...read more

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Q10. What is main function of LA in Substion.

Ans.

The main function of LA in a substation is to protect electrical equipment from lightning strikes.

  • LA stands for Lightning Arrester.

  • It is installed in substations to divert lightning strikes away from sensitive equipment.

  • LA provides a low-impedance path for lightning current to flow to the ground.

  • It helps in preventing damage to transformers, circuit breakers, and other electrical devices.

  • LA operates by ionizing the air around it, creating a conductive path for lightning curre...read more

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Q11. What are the various types of conductors and details?

Ans.

Various types of conductors include copper, aluminum, and steel.

  • Copper: highly conductive, commonly used in electrical wiring

  • Aluminum: lighter and cheaper than copper, used in power lines

  • Steel: used in overhead transmission lines for strength and durability

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Q12. Transformer working Principal

Ans.

Transformer works on the principle of electromagnetic induction to transfer electrical energy between two or more circuits.

  • Transformers have two coils of wire, known as primary and secondary coils.

  • When an alternating current flows through the primary coil, it creates a changing magnetic field.

  • This changing magnetic field induces a voltage in the secondary coil, transferring electrical energy.

  • Transformers are used to step up or step down voltage levels in power distribution sy...read more

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based on 8 interviews
1 Interview rounds
Technical Round
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