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Thermax Limited

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10+ Vyapar Interview Questions and Answers

Updated 4 Mar 2025
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Q1. WHICH MATERIAL IS USED FOR MAKING CYLINDER BLOCK AND PISTON?

Ans.

Cylinder blocks are made of cast iron or aluminum alloy, while pistons are made of aluminum alloy.

  • Cylinder blocks can also be made of steel or magnesium alloy.

  • Aluminum alloy is preferred for pistons due to its lightweight and good thermal conductivity.

  • Cast iron is preferred for cylinder blocks in diesel engines due to its strength and durability.

  • Steel is preferred for high-performance engines due to its strength and heat resistance.

  • Magnesium alloy is used in some racing engin...read more

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Q2. WHAT IS SUPERCHARGING AND TURBOCHARGING?

Ans.

Supercharging and turbocharging are methods of increasing the power output of an engine by forcing more air into the combustion chamber.

  • Supercharging uses a belt-driven compressor to force more air into the engine

  • Turbocharging uses exhaust gases to spin a turbine which compresses air and forces it into the engine

  • Both methods increase engine power and performance

  • Superchargers provide instant boost while turbochargers have a slight delay before boost kicks in

  • Examples of superch...read more

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Q3. What is different between Cooling tower and chillers in thermal equipments.

Ans.

Cooling towers remove heat from water used in industrial processes, while chillers cool water for air conditioning systems.

  • Cooling towers use evaporation to remove heat from water, while chillers use refrigeration to cool water.

  • Cooling towers are used in industrial processes such as power plants, while chillers are used in air conditioning systems for buildings.

  • Cooling towers are typically larger and more complex than chillers.

  • Examples of cooling tower applications include co...read more

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Q4. How to calculate the pressure vessels blank diameter for dishes in hemisphere type

Ans.

Calculating pressure vessel blank diameter for hemisphere type dishes

  • Determine the required volume and pressure of the vessel

  • Calculate the radius of the hemisphere using the formula r = d/2

  • Calculate the surface area of the hemisphere using the formula SA = 2πr^2

  • Calculate the required thickness of the vessel walls using the formula t = PR/(2SE - 0.2P)

  • Calculate the blank diameter using the formula BD = 2r + 2t

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Q5. WHAT IS CARBON CREDIT AND ITS VALUE IN EURO?

Ans.

Carbon credit is a permit that allows a company to emit a certain amount of carbon dioxide or other greenhouse gases.

  • Carbon credits are traded on carbon markets.

  • The value of a carbon credit in Euro varies depending on the market demand and supply.

  • The European Union Emissions Trading System (EU ETS) is the largest carbon market in the world.

  • In 2021, the price of a carbon credit in the EU ETS reached a record high of over 50 Euro per tonne of CO2.

  • Carbon credits can be used by c...read more

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Q6. Work scope for witness and review of testing of electrical equipments

Ans.

Witness and review testing of electrical equipment to ensure compliance with standards and specifications.

  • Review testing procedures and documentation

  • Ensure equipment is tested in accordance with relevant standards and regulations

  • Verify test results and report any discrepancies

  • Provide recommendations for improvements if necessary

  • Witness actual testing process to ensure accuracy and reliability

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Q7. COMPARE 2 STROKE 4 STROKE ENGINES

Ans.

2 stroke engines have higher power output but lower fuel efficiency compared to 4 stroke engines.

  • 2 stroke engines have a simpler design with fewer moving parts.

  • 2 stroke engines produce power every revolution while 4 stroke engines produce power every other revolution.

  • 2 stroke engines require a mixture of oil and fuel while 4 stroke engines have a separate oil system.

  • 4 stroke engines have better fuel efficiency and produce less emissions than 2 stroke engines.

  • Examples of 2 str...read more

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Q8. What is supportive instrument for Piping.

Ans.

Supportive instruments for piping include pipe hangers, clamps, supports, and anchors.

  • Pipe hangers are used to support the weight of the pipe and its contents.

  • Clamps are used to hold pipes in place and prevent movement.

  • Supports are used to provide additional stability and prevent sagging or bending.

  • Anchors are used to secure the pipe in place and prevent it from shifting.

  • Examples include beam clamps, clevis hangers, riser clamps, and sway braces.

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Q9. DRAW IRON CARBON EQUILIBRIUM DIAGRAM

Ans.

The iron-carbon equilibrium diagram shows the relationship between carbon content and temperature in steel.

  • The diagram is also known as the 'iron-iron carbide diagram'

  • It is used to determine the properties of steel at different temperatures and carbon contents

  • The diagram shows the different phases of steel, including ferrite, austenite, and cementite

  • The eutectoid point on the diagram represents the composition of steel that will transform entirely to pearlite upon cooling

  • The ...read more

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Q10. Power plant sector and jobs in work department

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Q11. Boiler and turbine light up procedure

Ans.

Boiler and turbine light up procedure

  • Check fuel and water levels

  • Purge air from the system

  • Start the boiler and bring it to operating pressure

  • Open the turbine inlet valve and gradually increase load

  • Monitor and adjust parameters as necessary

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Q12. What is Piping.

Ans.

Piping refers to a system of pipes used to transport fluids or gases in various industries.

  • Piping is used in industries such as oil and gas, chemical, pharmaceutical, and HVAC.

  • It involves the design, layout, fabrication, assembly, and maintenance of pipes.

  • Piping systems can include pipes, fittings, valves, supports, and insulation.

  • Examples of piping systems include water distribution systems, steam lines, and process piping in factories.

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