In this post, we will discuss civil engineer interview Questions answers. these questions may be helpful for your interview.

#### Civil engineer interview questions answers

**Question 1: What is ductility?**

Answer:**Ductility:** The ability of a solid material to deform under tensile strength is known as ductility.

**Ductile material:** A material that can easily be stretched into a wire when pulled is known as a ductile material. And this material does not become weaker or brittle in the process. Copper, steel, and aluminum are examples of ductile metals.

**Question 2**. ** How to find the weight of steel bar used in reinforcement?**

**Unit weight of the Steel Bar (in Kilograms/ meter) = (D square)/162.28 ~ (D^2)/162**

Where D is the Diameter of the Steel Bar in mm

*For Example-*

Question: Calculate the weight of 15 mm Steel Bar of Length 10 meters.

Answer: We know that the unit weight of steel can be derived from the Formula (D^2)/162.

Unit weight of 15mm Steel bar (kilograms/meter) = (D^2)/162 = (15 X 15)/162 = 1.380 kilograms/meter

Since we want to calculate the weight of a bar of length 10 meters, we multiply the unit weight with the length.

Weight of 10 meters length 15mm diameter Steel Bar = 1.38 Kilograms/ meter X 10 meter = 13.800 Kilograms.

* Always remember that the weight of Steel Bar should be approximated to 3 decimals as per IS Code.

Question3. ** Difference between the one-way slab and two-way slab**

**Answer: **

**One-way Slab:**

As the name suggests, a slab which is supported by beams on the two opposite sides to carry the **load** along one direction is known as the one-way slab.

In one-way slab, the ratio of the longer span to the shorter span is greater than or equal to 2.

(Longer Span/Shorter Span) ≥ 2

**Two-way slab:**

As the name suggests, the slab supported by beams on all the four sides and the loads are carried by the supports along both directions is known as the two-way slab.

In a two-way slab, the ratio of the longer span to the shorter span is less than 2.

(Longer Span/Shorter Span) < 2

So it is easy to remember, if the load is carried by one direction then it is the one-way slab.

If the load is carried by both (2) directions then it is a two-way slab.

**Question 4: What is the crank length formula?**

Answer: Formula of Crank length in the steel bar = (D1+D2+5)*10mm

Where D1 = diameter of the smaller bar.

D2= diameter of the largest bar.

The crank length in Slab is 0.42 D.

Where D is Depth of Slab- (Top cover +Bottom Cover)

**Question 5. What do you mean by segregation in concrete?**

**Answer: **As the name suggests, segregation is the separation or isolation from one thing to another. A separation of sand, cement from aggregate is known as segregation. Segregation is caused due to the high cement-water ratio in concrete. The other reason is the excessive vibration of concrete using a mechanical needle vibrator. The heavier particles settle down and the lighter particles like- sand, cement comes at the top.

**Question 6: What are the Compressive Strengths of bricks?**

**Answer: **

Firebrick-125/cm^{2}

First class brick-105kg/ cm^{2}

Second class brick-70kg/cm^{2}

Common building brick – 35 kg/cm^{2}

Sun-dried brick – 15 to 25 kg/cm^{2}

**Question7. How to check the quality of cement on the site?**

**Answer: **

**Following are the points on which we can check the quality of the cement on the site.**

**Date of Manufacturing:** Strength of cement decreases with its age. So the date of manufacturing should be checked.

**Colour test:** The Colour of cement should be grey with light greenish shade and this color should be uniform. Cement color gives an indication of excess lime or clay.

**Float test:** The good cement would not float if you throw the cement in water.

**When you put your hand in the cement bag you should feel cool.**

**Question8. What are the concrete tests?**

Answer: The concrete tests are as following

Compressive strength test

Slump test

Water absorption test

Water permeability test

**Question9. Define seepage?**

Seepage is the slow percolation of water through the soil.

**Question10. What is the unit weight of the concrete?**

**Answer: **As per IS: 456-200 Unit weight of Plane concrete is 24KN/meter^3 (24 KN per meter cube) and RCC is 25KN/meter^3 (25 KN per meter cube).^{
}

**Follow us on **