20+ HNI Technologies Interview Questions and Answers

Unit weight of different diameters of steel bars

• Unit weight of steel = D^2/162.2 kg/m, where D is the diameter of the steel bar in mm

• Calculate unit weight for each diameter provided in the question

• 32mm dia steel: 32^2/162.2 = 6.31 kg/m

• 25mm dia steel: 25^2/162.2 = 3.85 kg/m

• 20mm dia steel: 20^2/162.2 = 2.47 kg/m

• 16mm dia steel: 16^2/162.2 = 1.57 kg/m

• 10mm dia steel: 10^2/162.2 = 0.62 kg/m

• 08mm dia steel: 08^2/162.2 = 0.39 kg/m

• 06mm dia steel: 06^2/162.2 = 0.22 kg/m

The size of plywood board used in centring varies depending on the specific project requirements.

• The size of plywood board used in centring can range from 4 feet by 8 feet to 4 feet by 10 feet.

• Thicker plywood boards are typically used for heavier loads or taller structures.

• Plywood boards are commonly used in construction for formwork and temporary support structures.

• The size of plywood board used in centring is determined by the size and weight of the concrete structure being...read more

Shear slump is a type of concrete slump that measures the consistency of concrete under shear stress.

• Shear slump is a measure of the ability of concrete to resist deformation under shear forces.

• It is determined by measuring the difference in height between the center of the concrete cone and the average of the four sides.

• Shear slump is important in applications where concrete is subjected to shear forces, such as in beams and columns.

• A low shear slump indicates a stiffer and ...read more

The length of props used in staging varies depending on the specific requirements of the production.

• The length of props can range from a few inches to several feet, depending on the size of the stage and the needs of the performance.

• Props used in staging can include furniture, small handheld items, and larger set pieces.

• The length of props is determined by the director and set designer during the planning stages of the production.

Generally, aggregates ranging from 3/8 inch to 1.5 inches are used in PCC.

• Aggregates used in PCC typically range from 3/8 inch to 1.5 inches in size.

• The size of aggregates used in PCC depends on the specific requirements of the project.

• Smaller aggregates are usually preferred for smoother finishes, while larger aggregates may be used for increased strength.

• For example, a common aggregate size used in PCC is 3/4 inch.

Unit weight of 20mm aggregate is typically around 1550 kg/m^3.

• Unit weight of 20mm aggregate is usually around 1550 kg/m^3.

• It can vary slightly depending on the specific gravity of the aggregate material.

• Unit weight is important in determining the amount of material needed for a project.

• For example, if the specific gravity of the aggregate is 2.7, then the unit weight would be 1620 kg/m^3.

Unit weight of 10mm aggregate is typically around 1600 kg/m^3.

• Unit weight of 10mm aggregate is usually around 1600 kg/m^3.

• It can vary slightly depending on the specific gravity of the aggregate material.

• Unit weight is important in determining the quantity of aggregate needed for a project.

HVDS Scheme is a High Voltage Distribution System used for efficient power distribution. Time to complete 1 km site drawing varies based on complexity.

• HVDS Scheme is a system for distributing electricity at higher voltages to reduce losses.

• Time to complete 1 km site drawing in AutoCad depends on complexity, experience, and tools used.

• For example, a simple site drawing may take a few hours, while a complex one may take days.

A construction joint is a planned break or gap in construction to allow for expansion, contraction, or movement of materials.

• Construction joints are used in various types of structures, such as buildings, bridges, and roads.

• They are typically created by leaving a gap between two sections of construction, which is later filled with a joint filler or sealant.

• Construction joints help to prevent cracks and damage caused by the movement of materials due to temperature changes or s...read more

The ratio of pole grouting refers to the proportion of grout material used in relation to the size of the pole being grouted.

• The ratio of pole grouting is typically expressed as a mix ratio of cement, sand, and water.

• Common ratios for pole grouting include 1:2:3 (cement:sand:water) or 1:3 (cement:water).

• The ratio may vary depending on the type of pole, soil conditions, and structural requirements.

• Proper mixing and application of grout is essential for the stability and longev...read more

Slump is a measure of consistency of concrete. It refers to the flowability of concrete.

• Slump is determined by conducting a slump test on freshly mixed concrete.

• It is measured in millimeters and indicates the workability of concrete.

• Different types of slumps include true slump, shear slump, and collapse slump.

• True slump occurs when concrete maintains a uniform shape after the slump test.

• Shear slump indicates a lack of cohesion in the concrete mix.

• Collapse slump occurs when th...read more

Formwork deshuttering time refers to the duration required for removing the formwork or shuttering from a concrete structure.

• Formwork deshuttering time is the period after which the formwork can be safely removed without affecting the structural integrity of the concrete.

• It depends on various factors such as the type of concrete, ambient temperature, humidity, and the strength development of the concrete.

• The deshuttering time is typically specified in the project specificatio...read more

11 KV wires typically use aluminum or copper conductors.

• Aluminum and copper are commonly used conductors for 11 KV wires.

• Aluminum conductors are lighter and cheaper, but have lower conductivity compared to copper.

• Copper conductors have higher conductivity and are more durable, but are heavier and more expensive.

• The choice between aluminum and copper conductors depends on factors like cost, weight, and conductivity requirements.

The depth of a pole erection varies depending on the type of pole and the soil conditions.

• The depth of a pole erection is typically determined by the height of the pole and the type of soil it is being installed in.

• In general, a pole should be buried at least one-third of its total length for stability.

• For example, a 12-foot pole should be buried at least 4 feet deep.

• In rocky or sandy soil, poles may need to be buried deeper for added stability.

• Consult local building codes an...read more

Concrete sampling is the process of collecting representative samples of concrete for testing and quality control purposes.

• Concrete sampling is essential to ensure the strength and durability of the concrete.

• Samples are typically taken from different locations and depths within the concrete batch.

• Sampling methods include using a scoop, a sampling tube, or a core drill.

• The number of samples required depends on the project specifications and the size of the concrete batch.

• Sampl...read more

The unit of sand is typically measured in cubic meters or cubic feet.

• The unit of sand is commonly measured in cubic meters (m³) or cubic feet (ft³).

• Other units like kilograms (kg) or tons (metric or imperial) can also be used depending on the context.

• For example, a construction project may require a certain amount of sand in cubic meters for concrete mixing.

To calculate the bar bending schedule (BBS) of a ring, you need to determine the diameter of the ring, the number of bars required, and the length of each bar.

• Calculate the circumference of the ring using the formula 2 * π * r, where r is the radius of the ring.

• Determine the spacing between the bars based on the design requirements and the diameter of the bars.

• Calculate the total length of bars required by multiplying the circumference of the ring by the number of bars needed...read more

Plaster can be checked by examining its color, texture, hardness, and adhesion to the surface.

• Check the color of the plaster for any discoloration or uneven patches.

• Feel the texture of the plaster to ensure it is smooth and free of bumps or cracks.

• Test the hardness of the plaster by gently tapping it with a tool or fingernail.

• Check the adhesion of the plaster by trying to peel it off the surface.

M20 Grade concrete ratio is 1:1.5:3 (cement:sand:aggregate)

• M20 Grade concrete has a ratio of 1:1.5:3 for cement:sand:aggregate

• This means for every 1 part of cement, 1.5 parts of sand and 3 parts of aggregate are used

• The total proportion is 1:1.5:3 which is commonly used in construction projects