# Most repeated job interview question for civil engineers|important question

Hello, friends in this article I am telling you about the Most repeated job interview question for civil engineers.

If you are a fresher civil engineer or sub-engineer and you are in search of a job, then this video will be most important for you because these types of questions are frequently asked in an interview for job.

### So, let’s start one by one, Top ten Most repeated job interview question for civil engineers

10) what do you mean by m20?

M stands for a mix of concrete, and 20 means 20 KN\mm^2 which is the characteristic strength of concrete.

This strength is gained by concrete after 28 days after the formation of a concrete structure.

The mix ratio of M20 grade concrete is 1:1.5:3

Where 1 is cement 1.5 is sand and 3 is aggregate.

9) What is the size of the concrete cube?

How many cubes should be made?

The size of a concrete cube is (151515) cm total 9 cube should be prepared to test in 3 days 7 days and 28 days taking three cubes at a time. It is prepared to test the strength of concrete at different stages of hydration.

8) What is the initial and final setting time of ideal cement?

The initial setting time of cement is around 30 min and the final setting time of cement is around 10 hours.

7) How to test workability of concrete?

= Workability of concrete can be tested by the method of slump test, flow test e.t.c

Workability is nothing but the character of concrete which is workable to construct the structure. Simply how simply it can be placed in formwork and cast for the desired shape.

6) How can you calculate the unit weight of the steel rod at the site?

Simply We calculate the weight of steel rod by formula (D^2/162). The value of the weight of the steel rod will be in kg/meter. Where D stands for value of the diameter of rod in millimeter {keep in mind the diameter should always be in milimeter}.

5) What is the difference between one way and two-way slab?

If the ratio of (Length/Width) > 2 then the slab is called a one-way slab.

If the ratio of (Length/Width) < 2 then the slab is called a two-way slab.

Further, I will make a detail video on one way and two-way slab.

4) What is the density of RCC and PCC?

RCC stands for reinforcement concrete cement which means the concrete which poses a steel rod in it.

and PCC stands for plain concrete cement.

The density of RCC is 25 KN/Cumec

And the density of PCC is 24 KN/Cumec

Cumec is a meter cube I am telling you if you may misunderstand.

3) What is honeycomb? How does it form?

Honeycomb in concrete is generally called air pocket or air void remained between the aggregate or materials of the concrete.

It is formed due to not proper compaction or over the proportion of water due to which cement slurry couldn’t reach some area of concrete.

This is very dangerous for concrete because it may reduce the strength of the structure and may fail to bear load at any time. It is usually formed during the time of casting concrete.

2) what Iis TMT?

This is a type of steel that is denoted by TMT (Fe 500). This means the steel has strength 500 N/mm^2.

TMT stands for “Thermo mechanically treated” this is a process to prepare a steel rod. It means that in this rod have more strength and high resistance than mild steel or normal steel.

Mild steel (Fe 250) – 250 N/mm^2

TOR steel (Fe 415) – 415 N/mm^2

TMT steel (Fe 500) – 500 N/mm^2

1) What should be the minimum clear cover of the column, beam, and slab?

>> Clear cover is the distance or cover provided on the steel rod of the structure.

So, the minimum clear cover of the column should be 40 mm.

the minimum clear cover of the beam should be 25 mm.

the minimum clear cover of the slab should be 20 mm.

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