25 Most Important Interview Questions For Bridge Engineer | Most Asked Questions in Interview

Here I’ll talk about the 25 most important Interview questions for Bridge Engineer. here I’ll share more than 20 important questions that you can share with your Civil Engineering Friends

In the B.tech Internship, I and my 4 friends applied for the Internship in the Construction of the NEW Brahmaputra Bridge Tezpur Assam.

At that time, the Pile work was going on the site. and we were watching the real working process of pile foundation. the one engineer guiding us through the work process.

We were not well known about these things. after semestre completion, we were on the table of questions of Bridge construction asking by our teachers. after years, I realise that, i should share with you these questions.

Sometimes we miss the minor answer from the interviewer. if you are JE, Supervisor, or want to work as a site Engineer in the bridge construction Field, you would be asked these questions. So preparation is compulsory to know these important questions before going for the interview.

So let’s get start

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1. What is Pile Foundation?

Answer- This is a kind of deep foundation used to resist the heavy and uneven load from the Vechiles. Pile foundation is opt where the soil bering capacity is very low and where the water body is very near to the structure.

2. What are the Types of Pile Foundation?

First devided on the basis of Function and the materials from which the Pile is made.

1. Based on Function-

Load Bearing Pile

a. End Bearing Pile- If these is a hard strata (Rock) under the the Foundation.

b. Friction Pile-  The Pile will resist the Friction Force when the load will transfer from above to the soils. mainly in the sandy soil.

Sheet Pile- To resist the Horizontal force or safe from the shear failure acts due   the Water or earthquake.

2. Based on Materils- 

  • Timber Pile
  • Concrete Pile
  • Steel Pile
  • Composite Pile

3. What is Cut Of Level?

Answer- This a the Level from where the Unsound Concrete is removed or Cut the Above portion of the Concrete and left the Group of Pile under Foundation.

4. What is the Minimum Diameter of Pile as per the IS-Code?


Marine-1000 mm

C I S (Cast In sits) Board Pile- 300 mm

I R C – 950 mm

5. What is the Minimum Casting Distance above the Cut-off Level.

Answer- At least 600 mm as per MORTH, so that unsound concrete (mud) Comes to the level of Casting concrete.

6. What is the menimum Percentage of vertical reinforcement in a Pile?

According to IRC 78, You could answer 0.4 % of the Total area of the Pile.

7. Distance of Offset of the Pile Cap From Pile Edge from outer to outer?

Answer- Minimum with the proper safety    150 mm edge-to-edge from each side. As you can see in the picture below.

Bridge Design

8. What is the Minimum Clear Cover From the Main Bar in the Pile?

Answer- A 55 mm clear cover should be there. Without cover, steel gets exposed to the environment and corrodes easily. Without cover, there will not be proper packing of concrete and the bond between steel and concrete.

9. What is the Main Clear cover distance from the Bottom main Bar in the Pile Cape from the (C. O. L) Cut of Level?

Answer- 60 mm. distance covered from the C.O.L to the Point where the Pile cap starts.

10. What are the F.O.S (Factor of safety) of the Pile?

Answer- This has different answers for different Pile as explained below-

2.5 % In Friction Pile

3 % In end bearing Pile

and it has a 2.5 % Bearing Capacity.

11. What is the Maximum offset in the Bearing and pedestal both Outside?

Ans- 150 mm

From the picture, you can see that the above part is bearing and the below concrete part is a pedestal.

12. What is the Tolerance in the Top Level Bearing & Pedestal?

Answer   -5 mm and + 5 mm. If more than this, there could be a problem with the deck slab or Road level in the bridge.

13. What is the Tolerance in Dislocation of Bearing and Pedastal? 

Answer- 3 mm

From the Pirctue, the red line shows the distance.


14. Tilting tolerance of Bearing & Pedestal?

Answer- 0.0001 mm.

Very less numerical digits show that the pedestal and bearing will transfer the load to Pier Cap.

15. What do you mean by Refractive Index (R. F)

Answer- It is the Reference Scale meaning the Ratio of 1 Unit value from the Map to the Real scenario.

1 cm= 500 m

R.F= 1/50000

16. What is the Difference Between the Plain Scale and the Diagonal Scale?

Answer- Plain Scale is used for the 2 D Measurement and Diagno Scale is Used for the 3 D Measurement.

17. What is the Bulking of Sand?

Answer- Bulking Increase gradually with Moisture Content. If the moisture content increases upto 4 % then the Bulking Volume of sand will increase upto 25 %.

18. What is Shrinkage?

Answer-Concrete gets contraction when moisture removes on drying, This phenomina is known as Shrinkage.   Cracks develop in the concrete surface due to the reduction in volume and strength reduces.


19.How much test to Check the Workability of the Concrete?

Answer- These are the test used to know the workability of concrete.

  1. Slump Cconcrete
  2. Compaction Factor
  3. Vee-Bee Test
  4. Flow Table Test

Workability means with how easy the prepared concrete will placed, compact and finsih in the structure without any extra effort. When the prepared concrete reaach from the RMC Plant to the site, then the above test must be checked to know the workanility f the concrete.

Workability test


20. What is the Least of Theodolite & Compass?

Answer- Theodolite = 20” (20 Seconds)

Comapss = 30″ (30 Seconds)

You should also know these Datas-

Dumpy Level= 5 mm

Auto Level= 5mm

Total station= 1 Sec

21. How Many Zone of a Sand Exist?

Answer- There are 4 Zones categorised named as

Zone I

Zone II

Zone III

Zone IV

When you see the picture below, it will clear to how these Zones are Distinguish on the basis of Fine aggregate as per the  requirements of any grading zone.
Grading Zone

22. What is the Initial and final setting time of Cement?

Answer- Initial Setting time- 30 minutes (Duration in which When the concrete is prepare with mixing and ready to placing and compaction)

Final Setting time- 10 Hours or 600 Minutes (Time duration in which the mixing is start and strength of the structure gain)

23. What is a Full form of DPR?

Answer- Detailed Project Report

When any civil engineering structure is build, there is a project report which Mentioned all the specifictaion. In this report, It includes Materail and quantity of materials, Machinary, workmanship  with the building of foundation, sub structure and superstructyure from the start to end of the project.

24. What is the Minimum soil bearing capacity for pile foundation?

Answer- This is dependent on a lot of factors.

  • Soil makeup,
  • Entrained moisture
  • Different Seismic zone, and
  • Weight

Generally The minimum for average structures and for all soils is 1500 PSF (Pounds on a square foot ), meaning that a nuclear density test must show that the soil can bear 1500 Pounds on a square foot area without compression.



When you go to Interview, Even single word answer are not remember. so it is adviced to Go through the list of these question and answer. Remembering these answer and the concept behind the each question will great help for you to start your career journey as a Bridge Engineer in the the civil Engieering Field.


FAQ (Frequently Asked Question)

What is Bridge Engineer?

Bridge Engieer helps in construting the Bridge project and Look after for the Outline of Every Details such as Pile foundation, Sub structure and superstructure, soil check survey and all aspect.

Is there any specific Bridge Engineering Course?

Answer- Yes, Definitely there are Institute Providing the On site Bridge Engieering course which can help you Excel your Skills in the Bridge construction and you’ll get the specific Position in this Field.

Is there any scope in Bridge Engineering Course?

Answer- In the Recent Trends the specific field of civil Engineering are making in Lakhs. Bridge Engineers salary ranges between ₹ 3 Lakhs to ₹ 15 Lakhs  Depends on the Seniority and work Experience.

How to design a bridge?
Answer- refer to IRC 112 for this
What skills are required for bridge and tunnel jobs?
Answer-The Practical Knowledge some institute Provide for 3 Month Cousre, will Help 
you gain knowldge of Bridge and Tunnel Design. 

How to Decide the Diameter of Pile?

Answer- Based on the design , How much load should be there , Types of soils , and there are many factors which decides the Diameter of Pile.

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