100 Interview Question Answers For Civil Engineers/Highway Engineers

100 Interview Question Answers
100 Interview Question Answers


100 Interview Question Answers For Civil Engineers/Highway Engineers


 Interview Question Answers For Civil Engineers/Highway Engineers:- Today, I am going to discuss the basic interview questions & answers which are mostly asked in the company of highway construction during interview, I hope this will help in increasing your basic knowledge in highway engineering.


No.101 – Concrete ratio for the foundation of the road sign As per section 1700?


Ans:- M15.


No.102 – Why camber Provided?


Ans:- To drain off rainwater from the road surface, as quickly as possible.



No.103 – Dumping of materials should be done at?


Ans:- Predetermined certain distance.


No.104 – Traffic capacity or traffic volume calculated in?




No.105 – Abrasion test performed by?


“Los angles apparatus.


No.106 – Aggregates Crushing value test perform by?




No.107 – Aggregates Impact value test perform by?


impact machine.


No.108 – Minimum thickness of thermoplastic is:- 2.5mm.


No.109 – Minimum layer thickness of DBM is:- 50mm.



No.110 – Specification of highway prepared by:- Morth.


No.111 – Color of the compound for road marking:- White & yellow.


No.112 – Color of the compound for road marking:- White & yellow.


No.113 –  Grade of emulsion used for priming:– SS-I.


No.114  – Thickness of debonding strip in the transverse joint should be:- 5mm.


No.115 – Section of Morth applicable for concrete?


Pavements:- 600mm.


No.116 – Thickness of mastic asphalt over bridge deck?


or roads:- 25 to 50mm.


No.117 – During application of thermoplastic pavement temperature should not be less than?


10degree Celcius.


No.118  – Measurement unit of C & G is:- SQM.


No.119  – Section of Morth for traffic sing:- 800.


No.120  – Paving of bituminous mix can’t be started if the wind speed is?


More than 40km/h @ 2mtr. Height.


No.121 – Grade of bituminous emulsion is used for tack coat:- RS-I.


No.122  – PQC surface should be kept continuously moist for a period of- 14 days.


No.123  – Moisture content at the time of compaction of DLC?


20% up the OMC. (Optimum moisture content).


No.124 – Types of bituminous emulsion used for road work if aggregates Are having –ve charge?




No.125  – Maximum dry density?


i). OGL:- 1.5N/m3.


ii). EMB:- 1.6N/m3.


iii). SG :- 1.75N/m3.


iv). GSB :- 2.0N/m3.


No.126 – What is the Rolling pattern of the Compactor?


Embankment + Sub-Grade 




One Low vibration


High Vibration


High Vibration


Plane Vibration


No.127 – Workability of PQC – +_25mm.


No.128  – Plastic index of Soil?


Embankment + Sub grade – 25% (max).


No.129  –  Maximum lumps in the Soil?


Embankment – 75mm & Sub grade – 50mm.


No.130– CBR value?


i). Embankment :- 6% (min).


ii). Sun Grade :- 8% (min).


iii). Earthen Shoulder:- 6% (min).


iv). Hard Shoulder:- 12% (min).


No.131– Tolerance value?


i). Embankment  Top :- +_ 20mm to +_ 25mm.


ii). Sub Grade Top :- +_ 20mm to +_ 25mm.


iii). GSB :- +_10mm.


iv). PQC :- +_5mm.


No.132–  Compaction value?


i). OGL :- 90% (min).


ii). EMB :- 95% (min).


iii). SG Top :- 97% (min).


iv). Earthern shoulders:- 97% (min).


No.133–  Moisture for all layers?


i). +_ 1 to 2% of optimum moisture content.


No.134–  Los angles abrasion value?


i). For surface Course < 30%.


ii). For Base Course < 50%.


No.135–  Soundness loss?


i). Loss of weight of Aggregates < 12% for sodium sulfate.


ii). Loss of weight of Aggregates < 18% for magnesium sulfate (MGSO4).


No.136– Specific gravity of aggregates should be?


lies between 2.6 to 2.9.


No.137–  Lab density of soil?


i). Embankment – 15.2kn/m3 (min).


ii). Sub Grade – 17.5Kn.m3 (min).


No.138 – Liquid limit of soil?


Embankment + Sub grade – 50% (max). 


No.139–  Formula for equilibrium superelevation?


Equilibrium – V2 / 127R.


No.140 – Aggregates Crushing value?


i). For base course < 45%. 


ii). For surface Course < 30%.


No.141–  Camber recommended As per IRC?



i). High Bituminous surfacing – 1.7 to 2% (1in 60 to 1 in 50).


ii). Thin Bituminous surfacing – 2% to 3% (1in 50 to 1 in 40).


iii). Water bound macadam – 2.5% to 3% (1in 40 to 1 in 33).


iv). Earthern Road – 3% to 4%.


No.142–  Aggregates Impact Value?


i). For surface course – <30%.


ii). For bituminous macadam – <35%.


iii). For Water bond macadam – < 40%.


No.143 – Minimum CBR value of Sub Grade soil?


Grater than 5%.


No.144 – Laying Temperature of Modified bitumen at the site?


130 to 150 degrees Celcius.


No.145 – Design life of rigid pavements – 30Yrs.



No.146 – IRC Recommendation for Super Elevation?


Types Of Road Maximum Super Elevation
i). Urban roads.       4% or 0.04
ii). Plain & Rolling.  7% or 0.07
iii). Hills Region. 10% or 0.10


No.147 – Benefit of VG Bitumen over Penetration Grade?


It takes care of both low & high temperatures.


No.148 – Laying Temperature of bituminous mix with modified bitumen should be?


130 to 160 degrees Celcius.


No.149 – Speed of the roller during rolling in GSB?


Shall not exceed 5km/hr.


No.150– Types of cracks in the bituminous surface?


i). Longitudinal cracks ii). Transverse cracks etc.


No.151 – Can VG -10 bitumen used in hot climate areas?


No, It doesn’t provide good rutting resistance. So, VG -3c should use in hot climate areas.


No.152– Design life of flexible movements?


15 years.


No.153 – Height of pedestrians?


1.2 meter from footpath level.


No.154 – Minimum CBR value of GSB?


Greater than 30%.


No.155 – Minimum Density of Sub Grade Soil?


Max. dry density should be Greater than 1.8Kn/m3.


No.156 – Life of polysulfide sealant as per NHAI?


5 to 7 years.


No.157 – The rigid pavements are checked for?


Flexural strength.


No.158 – No PQC shall be permitted When the temp. is more than?


35 degrees cel.


No.159 – Air temp. on which bituminous mix is to be laid shall not be less than?


10 degrees Celsius.


No.160 – Rolling temp. of bituminous mix with VG-30 bitumen should be?


90 degree Celsius minimum.


No.161 – Thickness of compacted layer of RE wall fill soil shall not be more than?




No.162 – Which layer act as drainage layer b/w subgrade & road base?


GSB Layer.


No.163 – Which type of bituminous emulsion is used for road work?


Ionic or cationic emulsion.



No.164 – Max. size of aggregates of the layer thickness of roadwork?


It should be a 2/3rd ratio.


No.165 – The PQC denotes?


Pavement Quality Concrete.


No.166 – Rolling tem. DBM with VG – 40 Bitumen – 50dc.


No.167 – Laying temp. DBM with VG -40 Bitumen – 150dc.


No.168 – Laying temp. of bituminous mix with VG – 30 Bitumen should be?


125degree Celcius.


No.169 –  Thickness of plastic sheets should not be Exceed?




No.170 –  Max. The compacted thickness of GSB shall be?




No.171 –  What is the length of dowel bars covered with plastic sheets?


2/3rd of plastic sheets.


No.172 –  Max. Percentage of Compaction of WMM should be?




No.173 –  Max. Percentage of Compaction of WMM should be?




No.174 –  The bars in Cement concrete pavements are at?


Longitudinal Joints.


No.175 –  Importance of Curing Compound?


i). To prevent the escape of water from the mix.


ii). To prevent dry shrinkage.


iii). To enhance the strength.


No.176 – Surface texture for PQC should be – 1 mm.


No.177 – Width of the final Saw cut of PQC panel in the longitudinal joint should be?


6 to 8mm.


No.178 – No vehicle movement should be allowed on the finished surface of PQC within a period of?




No.179 – Maximum laying speed of concrete paver should be?




No.180 – No PQC Shall be done when the temp of the concrete
reaching the paving site is above?


30 degrees Celsius.


No.181 – The rigid pavement tolerance in the surface level of Sub Grade (DLC)?




No.182 – The layer not required underneath rigid pavements?


Base Layer.


No.183 – If curing compound is not applied on the surface of DLC, how many days of curing with a covering of hessian cloth or gunny bags is required?




No.184 – DLC mix shall be transported by covering the tipping trucks with tarpaulin to protect from?


the weather action Sun, dust & wind.


No.185 – a factor considered for flexible pavements?



The design factors are considered on wheel load, soil, climate, pavement layer & drainage.


No.186 –  The first thickness assumed in the pavement?


It is called trail thickness. It may be later revised after design.


No.187 – Minimum factor of safety for rigid pavements?


It is 1.1 & if it doesn’t satisfy then the pavement thickness is revised.


No.188 – The cement Concrete road is designed with?


The cement slab is provided with dowel bars but it is not considered as reinforced concrete.


No.189 – Maximum size of materials of embankment?




No.190 – Maximum size of  Sub Grade construction?




No.191 – By which reference, clearing & grubbing is done?


Natural ground level (NGL).


No.192 – The fill materials used in embankment is?


The granular soil with less plasticity is more preferable in filling materials.


No.193 – Compacted layer thickness of embankment/ Subgrade with vibratory roller shall not be more than?


250mm in one time.


No.194 – The most common method used for the removal of air voids in the soil is?




No.195 – For homogeneous mix & avoid segregation of GSB, water should be added on?


Stock place of GSB.


No.196 – Types of flexural strength?


i). Shear failure


ii). Longitudinal cracks.


No.197 – Typical failure of cement concrete pavements?


i). Mud pumping.


ii). The spalling of joints.


100 Interview Question Answers
100 Interview Question Answers


No.198 – Type of binding materials is used in WBM roads?


Stone dust.


100 Interview Question Answers
100 Interview Question Answers


No.199 – Method of Pavement evaluation?


i). Structural evaluation of pavement.


ii). Evaluation of pavement surface condition.


No.200 – Width of vehicles affects the width of?


Shoulders, Parking spaces & lanes.


I hope this information can be useful for you guys.


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Thanks For the Great Attention!


Good Bye & Take Care


Happy Learning 😆 


100 Interview Question Answers For Civil Engineers/Highway Engineers



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