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?
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?
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?
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?
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
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?
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?
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?
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?
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?
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 Advertisement 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?
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.
No.198 – Type of binding materials is used in WBM roads?
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.
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100 Interview Question Answers For Civil Engineers/Highway Engineers