Cairn Oil Summer Intern Interview Questions, Process, and Tips

Topic:- Deadlines should be strictly followed during a Project in an industry or not

Q1. Why Transmission Voltages are always in Multiples of 11kV
Ans. 
Transmission voltages are in multiples of 11kV due to historical reasons and practical considerations.
• Historically, the standardization of transmission voltages around 11kV was influenced by early power system designs and equipment capabilities.

• Practically, using multiples of 11kV allows for easier voltage transformation and compatibility between different parts of the power grid.

• Higher voltages like 132kV, 220kV, and ...read more
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Q2. Which is the best type of Circuit Breaker for higher voltages and why?
Ans. 
The best type of Circuit Breaker for higher voltages is a Gas-insulated Circuit Breaker (GCB) due to its superior insulation properties and ability to handle high voltages.
• Gas-insulated Circuit Breakers (GCBs) are filled with sulfur hexafluoride gas, which has excellent insulating properties.

• GCBs are compact in size and can handle high voltages up to 1100 kV, making them ideal for high voltage applications.

• They are hig...read more
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Q3. Explain what you mean by switchgear and protection
Ans. 
Switchgear refers to electrical equipment used to control, protect, isolate, and switch electrical circuits. Protection involves measures to prevent damage to electrical equipment and ensure safety.
• Switchgear includes devices like circuit breakers, fuses, and disconnect switches.

• Protection involves measures like overcurrent protection, earth fault protection, and differential protection.

• Switchgear and protection are es...read more
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Q4. Explain the generation, transmission and distribution of Electrical System
Ans. 
Generation, transmission, and distribution of electrical system involves producing electricity, sending it through power lines, and delivering it to consumers.
• Generation: Electricity is produced at power plants using various sources such as coal, natural gas, nuclear, hydro, wind, or solar energy.

• Transmission: High voltage electricity is sent over long distances through transmission lines to substations.

• Distribution: L...read more
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