20+ Megha Engineering & Infrastructures Senior Engineer Interview Questions and Answers

M stands for mix design of concrete and the number after it represents the compressive strength of concrete after 28 days of curing.

• M represents mix design of concrete

• Number after M represents compressive strength after 28 days of curing

• Higher the number, higher the strength of concrete

• M20 - 20 N/mm², M25 - 25 N/mm², M30 - 30 N/mm²

Engine overhauling is performed when the engine is worn out or experiencing significant performance issues.

• Engine overhauling is done to restore the engine's performance and extend its lifespan.

• It is typically performed after a certain number of operating hours or when specific symptoms are observed.

• Half engine overhauling involves disassembling and inspecting only half of the engine components, while full engine overhauling involves inspecting and replacing all components.

• Co...read more

Earth compaction machinery commonly used at construction sites include vibratory rollers, plate compactors, and pneumatic compactors.

• Vibratory rollers are heavy-duty machines that use vibrating drums to compact soil and asphalt.

• Plate compactors are smaller machines with a flat plate that vibrates to compact soil and granular materials.

• Pneumatic compactors use rubber tires or pads to compact soil and are often used for finishing and sealing surfaces.

• Other machinery like sheeps...read more

Building foundation in black cotton soil areas requires proper soil investigation and engineering techniques.

• Conduct a thorough soil investigation to determine the properties and behavior of the black cotton soil.

• Design the foundation based on the soil investigation report, considering factors like soil bearing capacity, settlement, and potential soil movement.

• Implement appropriate foundation techniques such as deep foundations (piles or piers) to transfer the load to more st...read more

The grade of steel used depends on the specific application and requirements.

• Different grades of steel are used for different purposes, such as construction, automotive, aerospace, etc.

• Common grades of steel include A36, A572, A514, and stainless steel grades like 304 and 316.

• The choice of grade depends on factors like strength, corrosion resistance, weldability, and cost.

• For example, high-strength low-alloy (HSLA) steels like A572 are commonly used in construction.

• Stainless ...read more

Without an air valve, the pipeline may experience air pockets, which can cause blockages, reduced flow, and damage to the pipeline.

• Air pockets can cause blockages and reduced flow in the pipeline.

• The pipeline may also experience damage due to the pressure caused by the air pockets.

• An air valve is necessary to release the air pockets and maintain the proper flow of the pipeline.

• Without an air valve, the pipeline may require frequent maintenance and repairs.

• Examples of pipeline...read more

The percentage of bitumen in DBM varies depending on the specific mix design and project requirements.

• DBM stands for Dense Bituminous Macadam, which is a type of road construction material.

• The percentage of bitumen in DBM typically ranges from 4% to 6% by weight.

• The exact percentage of bitumen is determined based on factors such as traffic load, climate conditions, and desired durability.

• Higher percentages of bitumen are used in areas with heavy traffic or extreme weather con...read more

Grade of concrete mixing ratio varies from M5 to M30 depending on the strength required for the construction.

• M5 - 1:5:10 (Cement:Sand:Aggregate)

• M10 - 1:3:6

• M15 - 1:2:4

• M20 - 1:1.5:3

• M25 - 1:1:2

• M30 - 1:0.75:1.5

The impeller in vertical turbine pumps can be lifted or adjusted by removing the pump bowl and using a hoist or crane to lift the impeller out of the bowl.

• Remove the pump bowl cover and the column pipe

• Use a hoist or crane to lift the impeller out of the bowl

• Adjust the impeller by changing the number or position of the impeller blades

• Reinstall the impeller and pump bowl cover

Laser alignment tool is used for alignment in vertical turbine pumps.

• Laser alignment tool is used to align the pump and motor shafts.

• It helps to ensure that the pump operates efficiently and reduces wear and tear.

• The tool emits a laser beam that is projected onto a target on the opposite shaft.

• The alignment is adjusted until the laser beam hits the center of the target.

• Examples of laser alignment tools include the SKF TKSA 41 and the Fluke 830.

Tools used in the erection of a tower include cranes, hoists, scaffolding, and concrete mixers.

• Cranes are used to lift and place heavy materials and equipment.

• Hoists are used to lift workers and materials to different levels of the tower.

• Scaffolding provides a platform for workers to access different parts of the tower.

• Concrete mixers are used to mix and pour concrete for the foundation and structure of the tower.

There are several types of pumps including centrifugal, positive displacement, and axial flow pumps.

• Centrifugal pumps use a rotating impeller to move fluid, while positive displacement pumps use a mechanical means to move fluid.

• Axial flow pumps are used for low head and high flow rate applications.

• Other types of pumps include jet pumps, gear pumps, and peristaltic pumps.

• The type of pump used depends on the application and the fluid being pumped.

There are several types of pipes, including metal, plastic, ceramic, and concrete.

• Types of pipes include metal, plastic, ceramic, and concrete.

• Metal pipes include copper, steel, and iron.

• Plastic pipes include PVC, CPVC, and PEX.

• Ceramic pipes are used for sewer lines.

• Concrete pipes are used for drainage and sewage systems.

Project execution involves planning, organizing, managing, and controlling resources to achieve specific goals within a set timeframe.

• Develop a project plan outlining objectives, scope, deliverables, timeline, and budget

• Assign tasks to team members based on their skills and expertise

• Monitor progress regularly and make adjustments as needed

• Manage risks and issues that may arise during the project

• Ensure effective communication among team members and stakeholders

• Deliver the proj...read more

Silk percentage in sand is zero.

• Silk is a natural fiber produced by silkworms, while sand is composed of small particles of minerals.

• Silk and sand have completely different compositions and properties.

• There is no silk present in sand, so the silk percentage in sand is zero.

There are several types of valves used in various industries, including gate, globe, ball, butterfly, and check valves.

• Valves are used to control the flow of fluids or gases in a system.

• Gate valves are used for on/off control and have a sliding gate that blocks or allows flow.

• Globe valves have a movable disk that regulates flow and are used for throttling.

• Ball valves have a rotating ball with a hole that controls flow and are used for quick shut-off.

• Butterfly valves have a ro...read more

Alignment devices are valuable for ensuring precision and accuracy in various industries.

• Alignment devices help to ensure that machinery and equipment are properly aligned, which can improve efficiency and reduce wear and tear.

• They are commonly used in industries such as manufacturing, construction, and automotive.

• Examples of alignment devices include laser alignment tools, dial indicators, and optical alignment systems.

• The value of an alignment device depends on the specific...read more

Piling methods refer to techniques used to install piles into the ground for foundation support.

• Driven Piles: installed by hammering or vibrating into the ground

• Bored Piles: drilled into the ground and then filled with concrete

• Screw Piles: twisted into the ground using a hydraulic torque motor

• Micropiles: small diameter piles used in limited access areas

• Sheet Piles: interlocking steel or concrete sheets driven into the ground to form a barrier

• Jet Grouting: high-pressure jet of...read more

Velocity valve regulates the flow of fluid in a hydraulic system based on the velocity of the fluid.

• Velocity valve is used in hydraulic systems to control the speed of actuators.

• It regulates the flow of fluid based on the velocity of the fluid.

• It helps in maintaining a constant speed of the actuator.

• Examples of velocity valves include flow control valves and pressure control valves.

A surge tank is used to control water pressure and prevent water hammer in a hydraulic system.

• A surge tank absorbs excess pressure caused by sudden changes in flow rate.

• It helps maintain a steady and controlled flow of fluid in the system.

• The surge tank acts as a reservoir to store and release fluid as needed.

• It prevents water hammer, which is a sudden increase in pressure due to the rapid deceleration or stoppage of fluid flow.

• Surge tanks are commonly used in water distribut...read more