DLF Project Engineer - Civil 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
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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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Q2. Laminar flow in fluid
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Laminar flow is a type of fluid flow where the fluid moves in parallel layers with minimal mixing between the layers.
• Laminar flow occurs at low Reynolds numbers.

• The flow is smooth and predictable, with little to no turbulence.

• It is characterized by a constant velocity profile across the flow.

• Examples include flow in small pipes, blood flow in capillaries, and flow in a viscous liquid.
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Q3. Turbulent flow in fluid
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Turbulent flow in fluid is characterized by chaotic and unpredictable movement of particles.
• Turbulent flow occurs when the fluid velocity exceeds a certain threshold, causing eddies and vortices.

• It is characterized by irregular fluctuations in velocity and pressure within the fluid.

• Turbulent flow is common in natural phenomena like rivers, oceans, and atmospheric air currents.

• It is important to consider turbulent flow ...read more
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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?
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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?
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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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Q2. 1.Concrete batch time which temperature of heat produced
Ans. 
Concrete batch time affects the temperature of heat produced during the curing process.
• The batch time of concrete refers to the duration for which the concrete ingredients are mixed together.

• A longer batch time can lead to higher temperatures being produced during the curing process.

• The heat generated during curing is important as it affects the strength and durability of the concrete.

• Proper monitoring and control of b...read more
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Q3. Types of footing
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Types of footing include spread footings, mat foundations, pile foundations, and drilled caissons.
• Spread footings are used for shallow foundations and distribute the load over a larger area.

• Mat foundations are used for heavy loads and distribute the load over a larger area.

• Pile foundations are used when soil conditions are poor and transfer the load to deeper, more stable soil layers.

• Drilled caissons are used for heavy...read more
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Q4. Bricks absorb water
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Yes, bricks absorb water due to their porous nature.
• Bricks have small pores that allow water to seep in.

• Water absorption can lead to deterioration of bricks over time.

• Bricks with high absorption rates may not be suitable for certain climates or applications.
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