Transformers & Rectifiers (India) Graduate Trainee Interview Questions and Answers

Who are you? Why do this job you?

Q1. What is transformers?
Ans. 
Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to increase or decrease the voltage of an alternating current (AC) electrical supply.

• They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.

• The primary winding is connected to the input voltage source, whil...read more
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Q2. Type of transformers
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Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.
• There are various types of transformers, including power transformers, distribution transformers, autotransformers, and instrument transformers.

• Power transformers are used to step up or step down voltage levels in power transmission and distribution systems.

• Distribution transformers are use...read more
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Q3. What is relay? Andavantage of relay
Ans. 
A relay is an electrically operated switch that uses an electromagnet to mechanically control the switching action.
• Relays are used to control high power or high voltage circuits with a low power signal.

• They can be used to switch on or off electrical devices remotely.

• Relays provide electrical isolation between the control circuit and the circuit being controlled.

• They are commonly used in automotive applications, industr...read more
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Q1. General introduction
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Q1. Question about your working area.
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Q1. Round 4 not required
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60 percent core and 40 percent aptitude

Q1. What are the tests done on a transformer
Ans. 
Tests done on a transformer include insulation resistance test, turns ratio test, winding resistance test, and load test.
• Insulation resistance test checks the insulation resistance between windings and between windings and ground.

• Turns ratio test measures the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.

• Winding resistance test measures the resistance of each windin...read more
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Q2. Why CT and PT are used
Ans. 
CT and PT are used in electrical systems for measurement and protection purposes.
• CT (Current Transformer) is used to measure high currents and step them down to a manageable level for measurement and protection devices.

• PT (Potential Transformer) is used to measure high voltages and step them down to a safe level for measurement and protection devices.

• CTs and PTs provide isolation and safety by separating the high volta...read more
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Q3. What is the generation voltage in india
Ans. 
The generation voltage in India varies depending on the location and power plant.
• The voltage ranges from 110V to 440V depending on the location.

• The power plants generate electricity at different voltages.

• The national grid operates at a voltage of 400kV and 765kV.

• India has a mix of AC and DC power transmission systems.
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Q4. Why do we use high voltage for transmission?
Ans. 
High voltage is used for transmission to reduce power loss and increase efficiency.
• High voltage reduces the current required for a given amount of power, which reduces power loss due to resistance in the transmission lines.

• Lower current also means smaller conductors can be used, reducing material and installation costs.

• High voltage transmission is more efficient over long distances, reducing the need for additional pow...read more
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Q5. Which power plant is cheapest to install
Ans. 
Renewable energy power plants are generally cheaper to install than traditional fossil fuel power plants.
• Renewable energy power plants such as solar, wind, and hydroelectric are cheaper to install than traditional fossil fuel power plants.

• The cost of installation for renewable energy power plants has decreased significantly in recent years due to advancements in technology and increased demand.

• Fossil fuel power plants ...read more
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Q6. Why OC test done on LV side and SC test on HV side of Transformers
Ans. 
OC test is done on LV side to avoid high voltage on secondary side. SC test is done on HV side to avoid high current on primary side.
• LV side has lower voltage rating, hence safer for OC test

• HV side has higher current rating, hence suitable for SC test

• OC test checks insulation resistance and winding resistance

• SC test checks impedance and voltage regulation

• Example: A 100 MVA transformer with 220 kV HV and 33 kV LV rating
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The topic can range from current affairs and social issues to abstract concepts or case studies. It may be assigned randomly or chosen from a list.

Used to evaluate performance, implement strategies, solve specific problems, or contribute to organizational goals.

Q1. Nothing serious if you went on ref all interview are scheduled on ref basis
Ans. They dont even ask your name if you went there on ref i have seen many peoples who write their name spelling wrong in CV still gets selected on ref basis, so make sure you have proper ref
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Q2. About your previous experiance
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Q1. Hr always ask about your self and offers 15 to 20% hike and try to convince you to settle for low by telling you brand value and told u they will give you increament after 6 month depends on your perform...read more
Ans. Make sure you get enough hike they never revise your sallery once you join.
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Q1. Pahle kya kaam karte the
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Q2. Battery main kitne cell hote hai
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Q3. Battery ki toc ka full form
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Q4. Ocv ka kya matlab hota hai
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Quantitative aptitude, Logical reasoning

Q1. What is production planning, what is supply chain, what is prime mover?
Ans. 
Production planning involves creating a schedule for manufacturing goods, supply chain is the network of organizations involved in producing and delivering a product, prime mover is the initial force that sets a process in motion.
• Production planning is the process of scheduling and coordinating all the tasks necessary to manufacture a product.

• Supply chain refers to the network of companies involved in producing and del...read more
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Q1. Tell about your Project?
Ans. Tell about various projects worked upon
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Q2. How to handle labour
Ans. 
Handling labour requires effective communication, motivation, and management skills.
• Establish clear expectations and goals for the labour force

• Provide adequate training and resources to ensure job success

• Maintain open lines of communication to address concerns and provide feedback

• Recognize and reward good performance to motivate workers

• Address conflicts and disciplinary issues promptly and fairly

• Ensure compliance with ...read more
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