DLF Sr.Engineer-Projects Interview Questions and Answers

Q1. How to check concrete slump
Ans. 
Concrete slump can be checked using a slump cone and measuring the difference in height before and after filling with concrete.
• Prepare the slump cone by wetting it and placing it on a flat, level surface.

• Fill the cone with concrete in three layers, each tamped with a rod 25 times.

• Lift the cone vertically and measure the difference in height between the top of the cone and the displaced concrete.

• The slump value is the d...read more
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Q2. How to check concrete cube
Ans. 
To check concrete cube, perform a compression test to determine the strength of the concrete.
• Perform a compression test on the concrete cube using a compression testing machine.

• Calculate the compressive strength of the concrete cube by dividing the maximum load applied to the cube by the cross-sectional area of the cube.

• Compare the compressive strength of the concrete cube with the specified strength in the design mix ...read more
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Quality control and waste management

Maths reasoning and core subjects

Q1. M20 Grade Concrete proportion?
Ans. 
M20 grade concrete proportion is 1:1.5:3 (cement:sand:aggregate) with a compressive strength of 20 MPa.
• M20 grade concrete is commonly used for residential and commercial construction.

• The proportion of cement, sand, and aggregate is 1:1.5:3 by volume.

• The compressive strength of M20 grade concrete is 20 MPa.

• The water-cement ratio for M20 grade concrete is typically 0.5.
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Q2. M40 concrete strength?
Ans. 
M40 concrete has a compressive strength of 40 megapascals (MPa).
• M40 concrete is a high-strength concrete mix commonly used in construction.

• It has a compressive strength of 40 MPa, which means it can withstand heavy loads and pressure.

• M40 concrete is typically used in the construction of bridges, high-rise buildings, and other structures that require high strength and durability.
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Q1. 20mm dia rod unit weight?
Ans. 
The unit weight of a 20mm dia rod varies depending on the material it is made of.
• The unit weight of a 20mm dia rod made of steel is approximately 2.47 kg/m

• The unit weight of a 20mm dia rod made of brass is approximately 3.68 kg/m

• The unit weight of a 20mm dia rod made of aluminum is approximately 1.57 kg/m
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Q1. Tell me about yourself.
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Q2. Good skills sincer good job
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Q1. The technical name of cube filling rod?
Ans. 
Cube filling rod is technically known as 'Tamping rod'.
• Also known as tamping rod

• Used to compact concrete in cube molds

• Helps in removing air voids and ensuring uniform density

• Typically made of steel or iron

• Standard length is 16 inches with a diameter of 5/8 inch
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Q1. What is BBS fullform
Ans. 
BBS stands for Bar Bending Schedule.
• BBS is a document that provides details of reinforcement cutting length, type, and size of bars used in construction.

• It helps in estimating the quantity of steel required for construction.

• BBS is essential for ensuring the structural integrity and strength of the building.

• Example: BBS includes information on the number of bars, their diameter, spacing, and placement in beams, columns,
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Reasoning + Technical Questions

Discussion on EV vehicles.

Q1. Related to site
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