L&T Energy Hydrocarbon Mechanical Engineer Interview Questions and Answers for Experienced

IS Code of Design Mix refers to Indian Standards for concrete mix design, ensuring quality and performance in construction.

• IS 456:2000 provides guidelines for plain and reinforced concrete design.

• IS 10262:2019 outlines the procedure for concrete mix design.

• Mix design considers factors like workability, strength, and durability.

• Example: A mix design for M25 concrete specifies a ratio of 1:1:2 (Cement:Sand:Aggregate).

• The...read more

Welding methods for steel include various techniques like MIG, TIG, and Stick welding, each suited for different applications.

• MIG Welding (Gas Metal Arc Welding) - Uses a continuous wire feed and is ideal for thin to medium thickness steel.

• TIG Welding (Gas Tungsten Arc Welding) - Provides high precision and is suitable for thin materials and stainless steel.

• Stick Welding (Shielded Metal Arc Welding) - Versatile and com...read more

Steel shuttering offers durability, reusability, and precision in construction, enhancing project efficiency and quality.

• Durability: Steel shuttering can withstand harsh weather conditions and heavy loads, making it suitable for large-scale projects.

• Reusability: Unlike timber, steel can be reused multiple times, reducing material costs over time.

• Precision: Steel shuttering provides a high level of accuracy in dimension...read more

Composite plates offer enhanced strength, lightweight properties, and design flexibility for various applications.

• High strength-to-weight ratio: Composite plates are significantly lighter than metals, making them ideal for aerospace applications.

• Corrosion resistance: They resist environmental degradation, suitable for marine and chemical industries.

• Design flexibility: Can be molded into complex shapes, allowing for inn...read more

Laying blocks involves precise techniques for alignment, mortar application, and ensuring structural integrity.

• Prepare the foundation: Ensure the base is level and clean before starting.

• Mix mortar: Use the right ratio of cement, sand, and water for optimal adhesion.

• Lay the first block: Start at a corner, applying mortar to the bottom and sides.

• Check alignment: Use a level to ensure blocks are straight and even.

• Stagger ...read more

BMD for sway frame is a diagram showing the variation of bending moment along the length of the frame.

• BMD for sway frame will have a shape similar to a zigzag pattern due to the presence of sway in the frame.

• The bending moment will be maximum at the points where the frame experiences maximum sway.

• The BMD can be drawn by analyzing the internal forces and moments acting on the frame.

Drawing piperack elevations involves creating detailed drawings of the structure from different viewpoints.

• Start by determining the dimensions and layout of the piperack

• Use software like AutoCAD to create accurate and detailed drawings

• Include all necessary details such as pipe sizes, supports, and connections

• Label all components clearly for easy understanding

• Review and revise the drawings as needed for accuracy

PWHT requirement is as per code for stress relieving and improving mechanical properties of welded components.

• PWHT stands for Post Weld Heat Treatment.

• PWHT is required to relieve residual stresses in welded components.

• PWHT helps improve mechanical properties such as toughness and ductility.

• PWHT requirements are specified in various welding codes and standards such as ASME, AWS, and API.

Impact testing as per code is a method used to determine the toughness and resistance of materials to sudden loading.

• Impact testing is conducted to assess the behavior of materials under high-stress conditions.

• It helps in determining the ductility, brittleness, and toughness of materials.

• Common methods of impact testing include Charpy and Izod tests.

• Results of impact testing are compared to specified codes and standard...read more