Highway Engineer interview Question for civil engineer

1 What sorts of asphalts are there? 

Ans: Flexible & Rigid Pavements

2 What is the difference between Flexible and Rigid Pavements?

Ans: Adaptable asphalt is made of squashed stone, rock, and soil with restricting bituminous material, though unbending asphalts are made of concrete, a combination of coarse total and fine total; in unbending asphalt, Portland concrete is utilized for restricting material.

3 What is the difference between OGL and NGL?

Ans: The principal level of taking of the regular ground without utilizing any mechanical means is called NGL, while the level taken after the arrangement of the bed utilizing mechanical means Grader, Nap, and JCB Roller is called OGL.

4 Why is Dowel Bar being provided with PQC (Pavement Quality Concrete?

Ans: Dowel bars are expected at extension joints to move the wheel burden to the nearby piece. It is given in the wheel ways as it were; it interfaces the two adjoining structures by moving burdens across the joints.

 4.What is the minimum CBR of subgrade soil ?

Ans : As per IRC 58-2015 Clause , a minimum CBR of 8 % is recommended for 500 mm of selected soil used as subgrade.

Q 4.What is code reference from which you are performing CBR test with 3 energy level as per MORTH 5 revision ?

Ans : AASHTO Designation: T 193-99 -2003

Q 5. What is the limit of Air Voids , flow & VFB in Dense Bituminous Macadam mix design ?

Ans : The limit of Air voids , flow & VFB is 3 -5% , 2- 4 mm & 65-75% simultaneously.

Q 6.How much staff is working under you , draw the organization chart & show your position ?

Ans : Total xyz staff is working under me is xyz , draw a diagram on your own & make practice.

Q 7.What should be the minimum required density of Subgrade soil as per MORT&H 5th revision ?

Ans : 17.5 KN/m³ or 1.78 gm /cc

Q 8 What is the softening point of VG 30 & VG40 grade bitumen ?

Ans : The softening point of VG30/VG 40 grade bitumen is 47 ºC / 50ºC

Q 9. What will be the maximum allowable size of granular material for subgrade soil as per MORT&H specification ?

Ans : Allowable size of granular material in subgrade is 50 mm

Q 10. What is the maximum Liquid Limit & Plasticity Index allowed in earth work in embankment/subgrade soil ?

Ans :Clay should have Liquid Limit less than 50 % & PI should always be less than 25 %.

Q 11. What is the frequency of taking core for BM/DBM/BC for checking of compaction & thickness of laid layer as per MORT&H 5th revision ?

Ans : One core at 700 m²

Q 12.What is the maximum Aggregate Impact Value of aggregate allowed for Bituminous concrete(BC) work in flexible pavement ?

Ans : AIV should not be more than 24%.

Q 13. What is the minimum cement content & maximum W/C ratio for M 25 RCC concrete for moderate condition as per MORT&H 5TH Revision ?

Ans : Minimum Cement Content 340 Kg & Maximum W/C ratio is 0.45

 14. What is the density frequency of compacted layer in Embankment & subgrade/Shoulder ?

Ans : 1 set of 10 test for 3000 m² of Embankment / 1 set of10 test for 2000 m² of Subgrade/Shoulder.

Q 15. What is difference between Specific Gravity & Density ?

Ans :Bulk density is the ratio between soil weight to the total volume of the soil  but Specific Gravity (G) is the ratio of the weight in air of a given volume of soil solids at a stated temperature to the weight in air of an equal volume of distilled water at that temperature . Specific gravity has no unit and it is generally used in design of concrete/bituminous mix.

Q 16. What is the maximum Aggregate Impact Value of aggregate for concrete work ?

Ans : 45%

Q 17 .What is the rate of spray of Prime Coat over WMM ?

Ans : 0.7 -1.0 kg/m²

Q 18.Which IS code specified the specification of aggregates ?

Ans : IS 383-2016

Q 19. How much Kinetic Viscosity of VG 40 bitumen is ?

Ans : The Kinematic Viscosity of VG 40 grade bitumen is 400 cst minimum at 135 º C.

Q 20. What is the dry density of WMM & GSB material in your project ?

Ans : The density of WMM/GSB in our project is 2.23 /2.24 gm/cc