Classic Construction Interview Questions and Answers

Piles are used in construction to transfer loads from a structure to a stronger layer of soil or rock below the surface.

• Types of piles include driven piles, bored piles, and screw piles.

• Piles are provided to support structures on weak or compressible soil, to resist uplift forces, or to provide lateral support.

• The diameter of a pile is determined based on the load it needs to support and the soil conditions.

• LVUP (Large...read more

The percentage of steel in a pile varies depending on the type and design of the pile.

• The percentage of steel in a pile can range from 0% to over 90%.

• The type of pile (e.g. steel, concrete, timber) and its design (e.g. diameter, length, wall thickness) determine the percentage of steel.

• Steel piles typically have a higher percentage of steel than other types of piles.

• The percentage of steel in a pile can also affect its

Pile built-up above cut off level as per IS code

• IS code specifies the maximum allowable pile length above cut off level

• Pile length above cut off level should not exceed 3 times the pile diameter

• Built-up pile above cut off level can cause structural instability and failure

Vertical tolerance for piles as per IS code

• As per IS 2911-1:2010, the vertical tolerance for piles is +/- 25mm

• This tolerance is applicable for both driven and cast-in-situ piles

• The tolerance is measured at the top of the pile and at intervals of 3m along the length

• If the deviation exceeds the tolerance limit, the pile may need to be rejected or remedial measures taken

Pile concrete consumption tolerance depends on various factors.

• Pile diameter and length

• Concrete mix design

• Placement method

• Quality control measures

• Environmental conditions

• Tolerance typically ranges from 5-10% of estimated consumption

• Regular monitoring and adjustment of concrete consumption is necessary

Unit weight of steel is 7850 kg/m³

• The unit weight of steel is the weight of a specific volume of steel

• It is measured in kilograms per cubic meter (kg/m³)

• The unit weight of steel is 7850 kg/m³

• This value may vary slightly depending on the composition and manufacturing process of the steel

The amount of cement used for making 1m³ of concrete varies depending on the desired strength and type of concrete.

• The cement content typically ranges from 300 to 400 kg/m³ for general-purpose concrete.

• For high-strength concrete, the cement content can be as high as 500 kg/m³ or more.

• The water-cement ratio also affects the amount of cement required.

• Admixtures and additives may be used to modify the properties of the co...read more

The amount of steel used for 1m³ concreting varies depending on the type of concrete and the structural requirements.

• The steel used in concrete is typically in the form of reinforcing bars (rebar) or welded wire mesh.

• The amount of steel required for 1m³ of concrete depends on the structural requirements and the type of concrete being used.

• For example, a standard reinforced concrete slab may require 70-100 kg of steel p...read more

Process piping works involve the installation, inspection, and maintenance of pipes used in industrial processes.

• Process piping works include the design, fabrication, and installation of pipes for conveying fluids or gases in industrial settings.

• QA QC engineers ensure that the piping systems meet the required standards and specifications.

• Inspection and testing of process piping is done to check for leaks, pressure, and...read more

Bolts tightening procedure involves following a specific torque value and sequence to ensure proper fastening of bolts.

• Check the torque value specified in the design or manual

• Use a torque wrench to tighten the bolts to the specified value

• Tighten the bolts in a specific sequence to ensure even distribution of load

• Recheck the torque value after tightening all bolts

• Record the torque value and sequence for future reference

Hydrotest and pneumatic test are methods used to test the integrity of piping systems.

• Hydrotest involves filling the piping system with water and pressurizing it to a specified level for a set duration.

• Pneumatic test involves filling the piping system with compressed air or nitrogen and pressurizing it to a specified level for a set duration.

• Both tests are used to ensure that the piping system can withstand the expecte...read more