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 1m3 bucket?
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?
Ans:
| For the National Highway/State Highway | Plain | Rolling | Mountain |
| 100 km/hour | 80 km/hour | 50 km/hour |
| Major District Roads | Plain | Rolling | Mountain |
| 80 km/hour | 65 km/hour | 40 km/hour |
| Other District Roads | 65 km/hour | 50 km/hour | 30 km/hour |
| Village Roads | 50 km/hour | 40 km/hour | 25 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.