20+ L&T Technology Services Interview Questions and Answers

Various types of equipment such as levels, theodolites, and total stations are used for leveling. Different types of surveys include topographic, construction, and boundary surveys.

• Equipment used for leveling include levels, theodolites, and total stations

• Levels are used for basic leveling tasks, theodolites for measuring angles and distances, and total stations for combined angle and distance measurements

• Types of surveys include topographic surveys for mapping land features,...read more

The unit used for estimating painting work is square feet.

• Square feet is commonly used to estimate the amount of paint needed for a project.

• Other units like square meters can also be used depending on the region.

• Calculations are based on the surface area to be painted.

M20 grade of concrete is a mix of 1:1.5:3 ratio of cement, sand, and aggregate.

• M20 grade of concrete has a compressive strength of 20 MPa after 28 days.

• The mix ratio for M20 grade concrete is 1:1.5:3 (cement:sand:aggregate).

• It is commonly used for residential construction projects like flooring, beams, and columns.

SBC stands for Safe Bearing Capacity.

• SBC is the maximum pressure that can be applied to the soil without causing shear failure.

• It is an important factor in the design of foundations for structures.

• Example: The SBC of a particular soil type is 200 kN/m^2.

The diameter of a Tunnel Boring Machine (TBM) varies depending on the project requirements and can range from a few meters to over 15 meters.

• The diameter of a TBM is typically determined by the size of the tunnel being constructed.

• TBMs used for subway tunnels may have a smaller diameter compared to those used for large transportation tunnels.

• Some TBMs can have diameters exceeding 15 meters for mega tunneling projects.

• The diameter of a TBM can also impact the cost and efficien...read more

The grade of concrete refers to its strength and is determined by the ratio of cement to sand to aggregate.

• The grade of concrete is typically denoted by a number followed by the letter 'M', such as M20, M30, etc.

• The number in the grade represents the compressive strength of the concrete in megapascals (MPa) after 28 days of curing.

• For example, M20 concrete has a compressive strength of 20 MPa, while M30 concrete has a compressive strength of 30 MPa.

• Higher grade concrete (e.g....read more

RL in survey stands for Reduced Level, which is the vertical distance between a point and a reference point.

• RL is used in surveying to determine the elevation of a point relative to a known reference point.

• It is commonly used in construction projects to ensure accurate leveling of structures and surfaces.

• RL can be calculated using leveling instruments such as a dumpy level or a theodolite.

• For example, if a benchmark has an RL of 100 meters and a point on a site has an RL of 1...read more

RL in survey stands for Reduced Level, which is the height of a point relative to a chosen reference point.

• RL is used in surveying to determine the elevation of points on the ground.

• It is usually measured in meters or feet above or below a specific reference point, such as a benchmark.

• RL is important for designing drainage systems, roads, and buildings to ensure proper water flow and structural stability.

• Example: If a benchmark has an RL of 100 meters, a point with an RL of 1...read more

SBC stands for Safe Bearing Capacity.

• SBC is the maximum pressure that can be applied to the soil without risk of shear failure.

• It is an important factor in the design of foundations for structures.

• For example, if the SBC of a soil is 200 kN/m^2, it means that the soil can safely support a load of 200 kN per square meter.

Reinforced Cement Concrete

• RCC stands for Reinforced Cement Concrete

• It is a composite material made of cement, sand, aggregate, and steel reinforcement

• RCC is commonly used in construction for its strength and durability

• Examples of RCC structures include bridges, buildings, dams, and pavements

Payback period is the time it takes for an investment to generate enough cash flow to cover its initial cost.

• Payback period is a financial metric used to evaluate the time it takes for an investment to recoup its initial cost.

• It is calculated by dividing the initial investment by the annual cash inflows generated by the investment.

• A shorter payback period is generally preferred as it indicates a quicker return on investment.

• For example, if a project costs $100,000 and generat...read more

Different RLs can be found by measuring the vertical distance between points on the figure.

• Measure the vertical distance between points A and B to find RL AB

• Measure the vertical distance between points C and D to find RL CD

• Measure the vertical distance between points E and F to find RL EF

Density of steel, concrete, bricks

• Steel: 7850 kg/m^3

• Concrete: 2400 kg/m^3

• Bricks: 1900-2100 kg/m^3

Water treatment plant process involves several steps to remove impurities and make water safe for consumption.

• Coagulation: Chemicals are added to water to make impurities clump together.

• Sedimentation: The clumped impurities settle at the bottom of the tank.

• Filtration: Water passes through layers of sand, gravel, and charcoal to remove remaining impurities.

• Disinfection: Chlorine or other chemicals are added to kill bacteria and viruses.

• Storage: Treated water is stored in tanks...read more

Different types of cement include Portland cement, rapid hardening cement, low heat cement, and sulfate resisting cement.

• Portland cement is the most common type used in construction.

• Rapid hardening cement sets quickly and gains strength faster than other types.

• Low heat cement generates less heat during hydration, making it suitable for large concrete structures.

• Sulfate resisting cement is used in environments with high sulfate content to prevent deterioration.

Different grades of concrete refer to the strength and quality of the concrete mix.

• Different grades of concrete are designated by their strength in megapascals (MPa), such as M20, M30, etc.

• Higher grade concrete has a higher strength and is typically used for structural purposes.

• Lower grade concrete is suitable for non-structural applications like paving or flooring.

• The mix proportions and ingredients vary for different grades of concrete.

• For example, M20 concrete has a mix ra...read more

The size of columns in civil engineering is determined based on the load they will support and the height of the structure.

• Columns are sized based on the load they will support, with larger loads requiring larger columns.

• The height of the structure also plays a role in determining column size, with taller structures requiring larger columns for stability.

• Factors such as material strength, column spacing, and building codes also influence column size.

• Examples: In a high-rise b...read more

Density of steel is approximately 7850 kg/m^3.

• The density of steel is around 7850 kg/m^3.

• Density can vary slightly depending on the type of steel.

• Steel is a commonly used material in construction and engineering projects.

Types of cement include Portland cement, white cement, rapid hardening cement, and low heat cement.

• Portland cement is the most common type used in construction.

• White cement is used for architectural purposes and to create colored concrete.

• Rapid hardening cement sets quickly and is used in projects with tight deadlines.

• Low heat cement generates less heat during hydration and is used in large concrete structures.