Praj Industries Interview Questions, Process, and Tips

Q1. Production piping regarding
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Q2. Hydro and erection and commissioning.
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Q1. What is estimation?
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Estimation is the process of predicting or calculating the value, size, or cost of something based on available information.
• Estimation involves making educated guesses based on available data

• It is used in various fields such as engineering, construction, project management, and finance

• Estimation helps in planning, budgeting, and decision-making

• Examples include estimating the cost of a construction project, predicting t...read more
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Online test conducted testing aptitude and technical knowledge

It was a group activity using jenga

Q1. Self introduction
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Q2. Technical knowledge
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Q1. What is design mix
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Design mix refers to the specific proportions of materials used in concrete to achieve the desired strength and durability.
• Design mix is a predetermined combination of cement, aggregates, and water to achieve the desired properties of concrete.

• It is based on the strength and durability requirements of the structure being constructed.

• Design mix is calculated by weight or volume of each material to ensure consistency and...read more
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Q2. Type of slump ?
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Slump is a measure of the consistency of fresh concrete.
• Type of slump refers to the shape that the concrete mix takes when it is placed in a slump test cone and then lifted off.

• Different types of slump include true slump, shear slump, and collapse slump.

• True slump is a general drop in the concrete mass evenly without disintegration.

• Shear slump indicates that one half of the concrete mass slides down or shears off.

• Colla...read more
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Q1. What is welding
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Welding is a process of joining two or more metal pieces together by melting and fusing them.
• Welding involves applying heat to the metal pieces until they reach a melting point

• A filler material is often used to help create a strong bond between the pieces

• Common types of welding include arc welding, MIG welding, and TIG welding

• Welding is used in various industries such as construction, automotive, and aerospace
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Q2. What is P91 metal welding
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P91 metal welding refers to welding techniques used for joining P91 steel, a type of high-strength, low-alloy steel commonly used in high-temperature applications.
• P91 steel is a type of low-alloy steel known for its high strength and creep resistance.

• Welding P91 steel requires preheating and post-weld heat treatment to prevent cracking and maintain mechanical properties.

• Common welding techniques for P91 steel include T...read more
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Q1. Pump,Line,CV,PSV Sizing etc Distilltion in details Heat Exchanger Details
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Q2. How to design HE
Ans. 
Designing a heat exchanger involves considering factors such as heat transfer requirements, fluid properties, and equipment selection.
• Determine the heat transfer requirements based on the desired temperature change and heat load.

• Select the appropriate type of heat exchanger based on the application, such as shell and tube, plate, or finned tube.

• Consider the fluid properties, including flow rate, viscosity, and thermal ...read more
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Q3. Pump Sizing and Calculation
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