Civil Engineering Interview Questions With The Best Probable Answers

Are you appearing for an interview for a civil engineering job? Then you must be wondering what could be the more expected questions which you might come across. Generally in an interview, for the civil site engineers, the simple questions are asked to test their basic knowledge. To know the most expected civil engineering interview questions, keep reading this blog.

Here we share with you some civil engineering interview questions with the best probable answers:

1) Name the various authorities or people who work on a construction site?

  1. Senior Engineer or Project manager

  2. Site Engineer

  3. Contractor

  4. Machinist

  5. Mason or labor

2) What is the least cover offered by different RCC Members?

Footing = 50 mm

Column = 40mm

Beam = 25mm

Slab = 20mm

3) What is the column in a building does?

The column is a vertical part in a building whose main function is to support the structural load and transfer it through the beams. Upper columns propagate load to the lower columns and finally to the ground through footings.

4) What is the cement, sand and aggregate ratios for the various concrete mix?

M10 – 1:3:6

M15 – 1:2:4

M20 – 1:1.5:3

M25 – 1:1:2

M30 – 1:1:1

5) What is honeycomb in concrete?

Honeycomb or the air pocket in the air voids in a concrete. It is formed during casting the concrete.

6) Does Water damage the concrete?

Plain concrete is not affected or damaged by water but the Reinforced Concrete can be damaged with water because the water might seep into the concrete and corrode away the steel reinforcement inside.

Check some more civil engineering interview questions above basics:

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

Initial setting time is about 30 minutes for almost all kind of cement. For masonry cement, it can be about 90minutes. Final setting time must be at max 10 hours. For masonry cement, it must not be more than 24hours.

8) What are the common methods of curing the concrete?

  • Spraying

  • Wet covering of Surface

  • Ponding

  • Applying curing chemicals

  • Steam curing

9) What is the formula for the weight of steel?

The weight of steel in kg can be calculated by the formula (D2*L)/162; where D is the diameter of steel bar in millimeter and L is the total length of steel bar in the meter.

10) What is “TMT”?

TMT is an acronym for “Thermo Mechanically Treated”. The TMT bars and sheet for construction purposes have high strength and high corrosion resistance in comparison to normal steels.

11) Differentiate between working stress method and limit state method?

Working stress method is a method of elastic designing in which structure is designed to bear the load up to elastic limit. Whereas, limit state method is a plastic designing method where the structure is designed to hold the load beyond any plastic limit.

12) What are field tests done to quality check the cement?

Quality of cement could be checked with color, physical properties, etc. Cement must have a grey color with light greenish shade. It must be smooth when rubbed between fingers. If you insert hand in a heap of cement, it should feel cool. When a pinch of cement is thrown in water then cement must float for some time before it sinks. It should be also lumped free.

13) What is the foundation types used in construction?

They are basically two types of foundation: Shallow & Deep foundation. A shallow foundation can be classified as combined footing, spread footing, strap or cantilever footing and finally mat or raft footing. Deep foundations can be differentiated into pile footing, pier footing, caissons footing and well-founded.

14) What are the different types of cement?

There are several types of cement namely: Ordinary Portland Cement (OPC), White Portland Cement (WPC), Portland Pozzolana Cement (PPC), Low Heat Portland Cement, Coloured Portland Cement, Hydrophobic cement, Rapid Hardening Cement, Portland Slag Cement, Sulphate Resisting Portland Cement, etc.

15) Define guniting?

It is a process in which cement and sand are mixed in a proportion of 1:3 and is thrown on a concrete surface with a cement gun under pressure of 2 to 3 kg/cm2.

16) What is the function of sand in mortar?

The main function of sand in mortar or plaster is to offer core strength, but it has other benefits as well. If water is mixed with binder without adding sand to the mixture, the strength of the mixture could be drastically lesser than in mixture with added sand. It can also help to prevent mortar shrinkage, increases density and helps in a setting.

17) What are various tests to check brick quality?

There is water absorption test, hardness test, shape, and size, crushing strength test, soundness test, etc. In water absorption test, a brick is dipped in water for 16 hours. If a weight of brick after being dipped in water doesn’t exceed by 20%, it could be considered as first-class brick, if lesser than 22.5% it can be considered as second-class brick, if lesser than 25% it becomes a third class brick. In crushing test, the crushing strength must be of about 10 N/mm2 for first-class brick, 7.5 N/mm2 for second class bricks. In hardness test, the brick is scratched with nails. It must be scratch free. In soundness test, the sound is checked by striking two bricks with each other.

18) What is the void ratio?

Void ratio is a ratio of a volume of voids to the volume of solids.

With this we conclude. Hope this piece of information on civil engineering interview questions helps to you. Keep looking into this space by career advice for more career guidance tips, news, and updates.

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