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I applied via Approached by Company and was interviewed before May 2021. There were 2 interview rounds.
posted on 19 May 2017
I appeared for an interview in Oct 2016.
Alumina is obtained from bauxite through the Bayer process.
Bauxite is crushed and mixed with sodium hydroxide to form a slurry.
The slurry is heated and pressurized in a digester to dissolve the alumina content.
The resulting solution is cooled and filtered to remove impurities.
The purified solution is then heated to precipitate the alumina as a white powder.
The alumina powder is washed, dried, and calcined to produce pu...
The reaction for Al extraction from alumina involves the reduction of alumina using carbon or electrolysis.
Alumina (Al2O3) is first converted into aluminum chloride (AlCl3) by reacting with hydrochloric acid.
The aluminum chloride is then reduced to aluminum metal by either carbon reduction or electrolysis.
In carbon reduction, carbon (usually in the form of coke) is heated with the aluminum chloride to produce aluminum ...
There are four main types of cast iron: gray iron, white iron, ductile iron, and malleable iron.
Gray iron is the most common type and has excellent castability and good machinability.
White iron is very hard and brittle, often used for wear-resistant applications.
Ductile iron has high strength and ductility, making it suitable for a wide range of applications.
Malleable iron is heat-treated to improve its strength and du...
I applied via Recruitment Consultant and was interviewed in Nov 2019. There were 3 interview rounds.
Mining is the process of extracting valuable minerals or other geological materials from the earth's surface or underground.
Mining is done to obtain various resources such as coal, gold, diamonds, and metals like iron, copper, and aluminum.
It involves the removal of soil, rocks, and other materials to access the desired minerals.
Mining can be categorized into surface mining and underground mining, depending on the loca...
I appeared for an interview before Jun 2021.
Physics,chem,math,quantitative apti.. etc
Electrolysis is a process of breaking down a compound using electricity. Aluminium can be prepared by electrolysis of alumina.
Electrolysis involves passing an electric current through a compound to break it down into its constituent elements.
Aluminium is prepared by electrolysis of alumina (Al2O3) dissolved in molten cryolite (Na3AlF6).
The process involves the use of carbon electrodes, which react with the oxygen relea...
I applied via Company Website and was interviewed in Jul 2021. There were 3 interview rounds.
I applied via Approached by Company and was interviewed before Mar 2022. There were 2 interview rounds.
Power station design involves the planning and construction of facilities that generate electricity.
Design includes selection of appropriate technology and equipment
Consideration of environmental impact and safety measures
Layout and construction of buildings and infrastructure
Integration with power grid and transmission systems
Examples include thermal power plants, hydroelectric power plants, and wind farms
Efficiency of a power station is the ratio of output power to input power.
Efficiency can be improved by using advanced technologies and equipment.
Regular maintenance and cleaning of equipment can also improve efficiency.
Efficiency can be affected by factors such as fuel quality, weather conditions, and demand for electricity.
For example, a power station using combined cycle technology can achieve an efficiency of up to...
I applied via Company Website and was interviewed before Jul 2021. There was 1 interview round.
Yes, Coal India is a state-owned coal mining company with operations in remote locations.
Coal India Limited is the largest coal-producing company in the world.
It has mines in remote locations such as Jharkhand, Chhattisgarh, and Odisha.
The company also has subsidiaries that operate in other countries such as Mozambique and South Africa.
I am drawn to this organization for its commitment to innovation, growth opportunities, and alignment with my career goals.
Alignment with Values: Your organization's focus on sustainability resonates with my personal values, as I am passionate about environmental responsibility.
Career Growth: I see ample opportunities for professional development here, such as mentorship programs and training workshops that can enhance...
I applied via Campus Placement and was interviewed before Sep 2021. There were 4 interview rounds.
Basic Maths, Science & Gk
Indian economy - 10 min
Air conditioning is the process of altering the properties of air to make it more comfortable, while refrigeration is the process of removing heat from a space or substance.
Air conditioning is used to cool and dehumidify indoor air for comfort.
Refrigeration is used to preserve food, medicine, and other perishable items.
Air conditioning uses a refrigerant to absorb heat from indoor air and release it outside.
Refrigerati...
Material properties and usage are crucial in determining the performance and durability of products in the real world.
Material properties such as strength, durability, and conductivity are important considerations in product design and development.
Different materials have different properties and are suited for different applications. For example, steel is strong and durable, making it ideal for construction and manufa...
Heat conduction is the transfer of heat through a material, while radiation is the transfer of heat through electromagnetic waves.
Heat conduction occurs in solids and liquids, while radiation can occur in vacuum or through transparent media.
Heat conduction is slower than radiation.
Examples of heat conduction include touching a hot stove or holding a warm cup of coffee, while examples of radiation include feeling the wa...
I applied via Referral and was interviewed before May 2021. There were 3 interview rounds.
I applied via Company Website and was interviewed before Nov 2021. There was 1 interview round.
My aims include professional growth, team leadership, and contributing to organizational success through innovative strategies.
Achieve a managerial position where I can lead a team effectively, like managing a project that improves efficiency by 20%.
Develop my skills in strategic planning and execution, similar to how I successfully implemented a new process in my previous role.
Foster a collaborative team environment t...
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