Lighthouse Canton Interview Questions and Answers

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 pure alumina.

• The remaining solution, known as red mud, is a ...read more

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 metal and carbon dioxide.

• In electrolysis, a molten mixture...read more

Yes, I have both a PAN card and an Aadhar card.

• Yes, I have a PAN card which is used for financial transactions and tax purposes.

• I also have an Aadhar card which is a unique identification number issued by the government of India.

• Having both cards is essential for various official and financial transactions.

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 ductility, commonly used for pipe fittings.

Limitations of laws of thermodynamics

• The laws of thermodynamics are based on idealized systems and may not fully apply to real-world situations

• They do not account for quantum effects at very small scales

• The laws assume equilibrium conditions, which may not always be the case in practical scenarios

• They do not consider the effects of external factors such as friction, air resistance, or electrical resistance

• The laws do not address the behavior of systems undergoing phase transi...read more