ArcelorMittal Nippon Steel Electrical Engineer Interview Questions and Answers

Q1. Why do we improve power factor.
Ans. 
Improving power factor helps in reducing energy losses, increasing system efficiency, and reducing electricity costs.
• Improving power factor reduces the amount of reactive power flowing in the system, which in turn reduces energy losses.

• Higher power factor means more efficient use of electricity and less strain on the electrical system.

• Improving power factor can lead to reduced electricity costs for consumers and utilit...read more
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Q2. What is buccholz relay, how does it work?
Ans. 
Buccholz relay is a protective device used in oil-filled transformers to detect faults such as internal arcing or overheating.
• Buccholz relay is installed in the oil pipe connecting the transformer tank and conservator tank.

• It works based on the principle that gas is generated when a fault occurs in the transformer, causing oil level to drop and gas to accumulate in the relay.

• The relay consists of two float switches - o...read more
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Q3. What is DP in siemens communication?
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DP in Siemens communication stands for Distributed Peripherals.
• DP is a communication protocol used by Siemens for connecting distributed peripherals to a central control system.

• It allows for real-time data exchange between the peripherals and the control system.

• DP is commonly used in industrial automation applications.

• Examples of DP communication modules include DP/DP couplers and DP slaves.
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Q4. How do we communicate s7 PLC and abb drive using profibus.
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To communicate S7 PLC and ABB drive using Profibus, you need to configure the Profibus network, set up the communication parameters, and establish the communication link.
• Configure the Profibus network by setting the correct baud rate, address, and other network parameters.

• Set up the communication parameters on both the S7 PLC and ABB drive to ensure they are compatible with each other.

• Establish the communication link b...read more
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Aptitude quite difficult and technical mcq round

Q1. Simple question related electrical machine
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Q2. Internship and project related question
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Q1. Which conductor use in transmission line
Ans. 
Transmission lines typically use aluminum or copper conductors for efficient electricity transfer over long distances.
• Aluminum conductors are lightweight and have good conductivity, making them ideal for overhead transmission lines.

• Copper conductors offer higher conductivity than aluminum but are heavier and more expensive.

• ACSR (Aluminum Conductor Steel Reinforced) combines aluminum and steel for strength and conductiv...read more
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Q2. Motor working principle
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Electric motors convert electrical energy into mechanical energy using electromagnetic principles.
• Motors operate on the principle of electromagnetism, where a magnetic field interacts with current-carrying conductors.

• The basic components include a stator (stationary part) and a rotor (rotating part).

• In AC motors, alternating current creates a rotating magnetic field that induces motion in the rotor.

• In DC motors, direct...read more
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Q3. Types of winding in motor
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Motors utilize various winding types, including stator and rotor windings, to create magnetic fields for operation.
• Stator Windings: Fixed windings that create a rotating magnetic field.

• Rotor Windings: Located on the rotor, can be squirrel cage or wound type.

• Lap Winding: Used in DC machines for low voltage and high current applications.

• Wave Winding: Suitable for high voltage and low current applications.

• Field Windings: ...read more
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Q4. Transformers working principle
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Transformers operate on electromagnetic induction to transfer electrical energy between circuits at different voltage levels.
• Transformers consist of two coils: primary and secondary.

• They work on the principle of Faraday's law of electromagnetic induction.

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

• This magnetic field induces a voltage in the secondary coil.

• Transformers can step ...read more
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Q1. They will ask about transformer, NGR, power system protection?
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Q1. Ask about your location, salary expectation, relocation?
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