Civil Engineer Highway Interview Question 2024

Q;01 For designing highways, IRC recommends the coefficient of friction as

Ans 0.15

Q:02 For earthen roads in heavy rainfall area common camber is

Ans 1 in 25

Q03: Dowel bars are used in rigid pavements

Ans to prevent warping

Q04 :Maximum number of vehicles can be parked with

Ans 90° angle parking

Q:05 What is the Land width of the shoulder in Plain and Rolling terrain?

Ans: The land width of the shoulder will be either 2.0 meters or 3.5 meters, depending on the situation.

Q:06 When will the newly constructed pavement with Portland cement attain its working strength?

Ans: The answer is that the working strength of Portland cement is 28 Days.

Q:07 Which is the most suitable equipment for compacting Clay soils?

Ans: Sheep Foot Roller.

Q:08 Which walls are necessary on the hillside of the roadway where the earth has to be retained from slipping?

Ans: Breast walls are constructed on the hillside area of the roadway.

Q:09 What is the vertical clearance of LVUP, VUP & CUP?

Ans: LVUP Clearance of 3.5 m, VUP clearance of 5.5 m, and CUP Clearance of 3.0 m.

Stand for

         LVUP = Light vehicular Underpass

         VUP   = Vehicular Underpass

         CUP   = Cattle Underpass

Q:10 What is the minimum Right of way that should be available ROW for 4 and 6 Lane Projects?

Ans: The minimum Right-of-way ROW of 60 m should be available for developing 4-lane and 6-lane projects as per IRC SP 84-2014 and IRC SP 87-2013.

Q:11 What is the Rule of Tie Bar? \

Ans: The bars are placed across longitudinal joints at the Mid-Depth of the Slab. It prevents lanes from separation differential deflections and transverse cracking.

Q:12 What is the Role of Joint Sealant?

Ans: It seals the joint width and keeps water and soil from entering the joint, which causes the dowel bar unforeseen joint pressure due to limited development.

Q:13 What is the minimum relative percentage compaction requirement for embankment and subgrade?

Ans: 95% & for subgrade 97%, relevant compaction is required for the barrier.

Q:14 Tell the level tolerance in the subgrade for flexible pavements?

Ans: Subgrade +/- 20 mm.

Q:15 What is the median width in the raised condition in Plain mountainous and steep terrain?

Ans: In plain area generally, 5.0 m, but in build-up area, 2.5 m. In mountainous and steep terrain, it is always 2.5 m.

Q:16 What is the minimum bitumen content in BDM and BC for Grade 1?

Ans: For BDM, 4.0 %, and BC, 5.2 %.

Q:17 For how many periods of flexible pavement design should be done?

Ans: Flexible pavement shall be designed for a minimum design period of 15 years or an operation period, whichever is more.

Q:18 For how many periods of Rigid pavement design should be done?

Ans: Rigid pavement shall be designed for a minimum design period of 30 years or an operation period, whichever is more.

Q:19 In tack coat and prime coat, which emulsion type is used per the 5th revision?

Ans: In prime coat SS1 & for tack coat RS1.

Q:20 How much minimum longitudinal slope is required for lined and unlined drained?

Ans: As far as possible, the longitudinal slope shall not be less than 0.3% for lined drained and for unlined drained 1.0%.

Q:21 What is the output of the excavator having a 1mbucket?

Ans: 60 m3/hour

Q:22 What is the width of the carriageway or main road? 

Ans: For single lane 3.75 meters.

        Two lanes without curbstone 7.5 meters.

        For Intermediate carriageway 5.5 meters.

Q:23 Maximum design speed for different roads?


For the National Highway/State HighwayPlainRollingMountain
 100 km/hour80 km/hour50 km/hour
Major District RoadsPlainRollingMountain
 80 km/hour65 km/hour40 km/hour
Other District Roads65 km/hour50 km/hour30 km/hour
Village Roads50 km/hour40 km/hour25 km/hour

Q: 24 Why is the mastic being provided on the deck slab?

Ans: By and large, the defensive layer is a mastic black-top layer; this layer likewise fills in as a subsequent waterproofing layer. The non-permeable mastic black top is typically utilized as the defensive layer of the scaffold asphalts.

Q:25 What are the grades of Hume pipes used in Highway construction?

Ans: Hume pipes are accessible in three grades: NP2, NP3, and NP4.