20+ JSD Electronics Interview Questions and Answers

The minimum grade of concrete used in R.C.C. works is M20.

• R.C.C. stands for Reinforced Cement Concrete.

• M20 grade concrete has a compressive strength of 20 N/mm² after 28 days of curing.

• The minimum grade of concrete used in R.C.C. works may vary depending on the structural requirements.

• Higher grades of concrete are used for structures that require higher strength and durability.

• Lower grades of concrete may be used for non-structural elements like paving and landscaping.

• The mix...read more

Open bag cement has a shelf life of about 3 months.

• Open bag cement should be used within 3 months of its manufacturing date.

• After 3 months, the cement may lose its strength and effectiveness.

• It is important to check the manufacturing date before using open bag cement.

• Storing cement in a cool, dry place can help extend its shelf life.

Different types of slabs include one-way slab, two-way slab, flat slab, waffle slab, and ribbed slab.

• One-way slab is supported on two opposite sides and is designed to bend in only one direction.

• Two-way slab is supported on all four sides and is designed to bend in two directions.

• Flat slab is a two-way reinforced concrete slab that does not have beams and is supported directly by columns.

• Waffle slab is a two-way slab with a grid of ribs on the underside, creating a waffle-lik...read more

To calculate the weight of an 8mm diameter steel rod, use the formula: weight = volume x density.

• Calculate the volume of the rod using the formula: volume = π x (diameter/2)^2 x length

• Find the density of steel, which is typically around 7850 kg/m^3

• Multiply the volume by the density to get the weight of the rod

Pipe laying, sewer networking, and road restoration are essential tasks for civil site engineers.

• Pipe laying involves the installation of pipes for water supply, drainage, and sewage systems.

• Sewer networking involves connecting pipes to create a network for the transportation of sewage and wastewater.

• Road restoration involves repairing and maintaining roads and pavements that have been damaged due to construction work.

• Civil site engineers are responsible for ensuring that the...read more

UTM stands for Universal Transverse Mercator.

• UTM is a coordinate system used to locate positions on the Earth's surface.

• It divides the Earth into 60 zones, each 6 degrees of longitude wide.

• UTM coordinates consist of a zone number, easting, northing, and hemisphere.

• It provides a more accurate representation of locations compared to latitude and longitude.

• UTM coordinates are commonly used in civil engineering and surveying projects.

Civil engineering is a branch of engineering that deals with the design, construction, and maintenance of the built environment.

• Civil engineering involves the planning, design, construction, and maintenance of infrastructure such as roads, bridges, buildings, and water systems.

• Civil engineers use principles of physics, mathematics, and materials science to design and build structures that are safe, efficient, and sustainable.

• Examples of civil engineering projects include the ...read more

There are several grades of concrete used in construction.

• The most common grades of concrete are M10, M20, M30, M40, M50, and M60.

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

• Higher grade concrete is used for structures that require greater strength, such as bridges and high-rise buildings.

• Lower grade concrete is used for non-structural elements like sidewalks and driveways.

Code of reinforcement refers to the standards and guidelines for the use of reinforcement in construction.

• Code of reinforcement provides specifications for the size, spacing, and placement of reinforcement in concrete structures.

• It also includes guidelines for the quality and testing of reinforcement materials.

• Examples of code of reinforcement include ACI 318, Eurocode 2, and BS 8110.

• Following the code of reinforcement ensures the safety and durability of the structure.

LD stands for Line Diagram.

• LD is a graphical representation of a system or process.

• It is commonly used in electrical engineering and process control.

• LD shows the flow of signals and power through the system.

• It is used to design and troubleshoot systems.

• LD can be created using software such as AutoCAD or Visio.

The level of work on the site is crucial for ensuring proper construction, safety, and functionality of the project.

• Ensures proper alignment and elevation of structures

• Affects drainage and water flow on the site

• Impacts the stability and strength of the foundation

• Helps in preventing issues like flooding or erosion

• Critical for meeting design specifications and standards

The nominal concrete proportion varies for different grades, typically ranging from 1:1.5:3 for M5 grade to 1:0.5:1 for M60 grade.

• M5 grade concrete typically has a proportion of 1:1.5:3 (cement:sand:aggregate)

• M20 grade concrete typically has a proportion of 1:1.5:3.5

• M40 grade concrete typically has a proportion of 1:0.5:1

The thickness of outer side plaster can vary depending on the specific requirements of the project.

• The thickness of outer side plaster is typically around 15-20 mm.

• However, it can be adjusted based on factors such as the type of building, weather conditions, and structural requirements.

• Consulting with a structural engineer or architect is recommended to determine the appropriate thickness for the outer side plaster.

There are different grades of concrete used in construction based on strength and durability requirements.

• Concrete grades are classified based on their compressive strength, such as M20, M30, etc.

• The 'M' stands for mix design, followed by the compressive strength in N/mm^2.

• Higher grade concrete is used for structures requiring higher strength, such as bridges and high-rise buildings.

• Lower grade concrete is used for non-structural elements like pavements and sidewalks.

There are mainly four types of foundations: shallow, deep, pile, and raft.

• Shallow foundations are used when the soil is strong enough to support the structure's weight close to the surface.

• Deep foundations are used when the soil is weak and the structure needs to be supported at a greater depth.

• Pile foundations involve driving piles into the ground to support the structure.

• Raft foundations are large slabs that support the entire structure and distribute the load evenly.

Grade of concrete for RCC is typically M20, M25, M30, etc. which represent the compressive strength of concrete mix.

• Grade of concrete is denoted by the mix ratio of cement, sand, and aggregates.

• Common grades include M20, M25, M30, etc. where 'M' stands for mix and the number represents the compressive strength in MPa.

• Higher grade concrete like M30 is used for structures requiring higher strength like bridges, dams, etc.

• Lower grade concrete like M20 is used for residential bui...read more

Cube mould size is a standard size used for testing the compressive strength of concrete.

• Cube moulds are typically made of steel or cast iron.

• The standard size for cube moulds is 150mm x 150mm x 150mm.

• Other sizes such as 100mm x 100mm x 100mm and 200mm x 200mm x 200mm are also used.

• The moulds are filled with concrete and left to cure before being tested for compressive strength.

• Cube moulds are used to ensure that the concrete used in construction meets the required strength s...read more

Reinforced cement concrete is a composite material made of cement, water, aggregates, and steel reinforcement bars.

• It is a combination of concrete and steel bars to enhance the strength and durability of the structure.

• The steel bars are placed in the concrete in such a way that they work together to resist tensile forces.

• Reinforced cement concrete is commonly used in construction of buildings, bridges, dams, and other structures.

• The steel reinforcement bars provide flexibilit...read more

Honeycomb is a structure made up of hexagonal cells, similar to those found in beehives.

• Honeycomb structures are commonly used in engineering for their strength and light weight.

• The hexagonal shape of honeycomb cells allows for efficient use of material.

• Examples of honeycomb structures include honeycomb core panels used in aerospace industry and honeycomb grids used in civil engineering for soil stabilization.

The size of bricks varies depending on the country and region they are used in.

• In the United States, the standard size for bricks is 2 1/4 x 3 3/4 x 8 inches.

• In the United Kingdom, the standard size for bricks is 65mm x 102.5mm x 215mm.

• Bricks can also come in different shapes and sizes for specific purposes, such as bullnose bricks for rounded edges.

• The size of bricks can affect the strength and stability of a structure, so it is important to choose the right size for the job...read more

Concrete tests are conducted to ensure the quality and strength of concrete used in construction projects.

• Compression test to determine the compressive strength of concrete

• Slump test to measure the workability of concrete

• Density test to check the density of concrete

• Water permeability test to assess the permeability of concrete

• Rebound hammer test to evaluate the surface hardness of concrete

Bleeding in concrete is the upward movement of water in a freshly placed concrete mix due to the settlement of solid particles.

• Bleeding occurs when water in the mix rises to the surface of the concrete.

• It is more common in high workability mixes with a high water-cement ratio.

• Bleeding can lead to segregation of the mix if not properly managed.

• To reduce bleeding, proper mix design and consolidation techniques should be used.

• Excessive bleeding can weaken the concrete and affect...read more

There are various types of structures, including buildings, bridges, dams, and tunnels.

• Buildings - residential, commercial, industrial

• Bridges - beam, arch, suspension

• Dams - gravity, arch, buttress

• Tunnels - cut-and-cover, bored, immersed tube

There are two main types of surveying: plane surveying and geodetic surveying.

• Plane surveying is used for small areas and assumes the Earth is flat.

• Geodetic surveying takes into account the curvature of the Earth and is used for larger areas or long distances.

• Other types of surveying include topographic surveying, construction surveying, and cadastral surveying.

QA stands for Quality Assurance and QC stands for Quality Control. QA focuses on preventing defects, while QC focuses on identifying defects.

• QA involves processes and procedures to ensure that the product or service meets specified requirements.

• QC involves activities such as inspections, testing, and sampling to verify that the product or service meets quality standards.

• QA is proactive in nature, aiming to prevent defects from occurring.

• QC is reactive in nature, focusing on i...read more