L&T Infrastructure Development Projects Senior Engineer Interview Questions and Answers

Least count is the smallest measurement that can be taken by an instrument.

• It is the smallest value that can be measured by an instrument.

• It is determined by the precision of the instrument.

• For example, the least count of a ruler with millimeter markings is 1 mm.

• It is important to consider the least count when taking measurements to ensure accuracy.

Stress is the force applied per unit area, while strain is the deformation caused by stress.

• Stress is a measure of the force applied to a material per unit area

• Strain is the measure of the deformation caused by stress

• Stress and strain are related by the material's elasticity and its ability to resist deformation

• Stress can be tensile, compressive, or shear

• Strain can be elastic, plastic, or failure

• Examples include stretc...read more

Important quality documents include SOPs, work instructions, quality manuals, and validation protocols.

• Standard Operating Procedures (SOPs) outline step-by-step instructions for performing tasks

• Work instructions provide detailed instructions for specific tasks

• Quality manuals outline the quality management system of an organization

• Validation protocols ensure that equipment, processes, and systems meet predetermined spec

Precast structures are pre-made concrete elements used in construction.

• Precast segments are manufactured off-site and transported to the construction site for assembly.

• They are commonly used in bridge construction, tunnels, and other large-scale infrastructure projects.

• Precast segments can be designed to fit specific project requirements, reducing construction time and costs.

• They offer high durability and strength, and...read more

Segment casting can be done using various methods depending on the material and application.

• One method is sand casting, where a mold is created using sand and the molten metal is poured into it.

• Another method is investment casting, where a wax pattern is created and coated with ceramic before the metal is poured.

• Die casting is a method where molten metal is forced into a mold under high pressure.

• Continuous casting is u...read more

Grade of concrete refers to its strength and durability.

• Grade of concrete is denoted by a number followed by 'M' which stands for mix.

• The number represents the compressive strength of concrete in megapascals (MPa).

• Common grades of concrete include M10, M20, M30, etc.

• Higher grade concrete has higher strength and durability.

• For example, M20 grade concrete has a compressive strength of 20 MPa.

Design mix of concrete refers to the proportion of materials used in making concrete.

• Design mix is determined based on the strength and durability requirements of the concrete.

• The mix includes cement, water, aggregates (sand, gravel, crushed stone), and sometimes admixtures.

• The proportions of each material are specified in terms of weight or volume.

• For example, a common mix for general use is 1:2:3 (cement:sand:gravel)...read more

Segment casting is a method of casting concrete segments for tunnel lining.

• Segments are cast in a factory and transported to the tunnel site.

• Segments are then assembled to form a complete tunnel lining.

• This method is commonly used in tunnel construction projects.

• It allows for faster construction and better quality control.

• Examples include the Channel Tunnel and the SMART Tunnel in Malaysia.