100 Interview Question Answers For Civil Engineers/Highway Engineers

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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?

 

Vehicles/hour.

 

No.105 – Abrasion test performed by?

 

“Los angles apparatus.

 

No.106 – Aggregates Crushing value test perform by?

 

“UTH”

 

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?

 

cationic.

 

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-Plane

+

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?

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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?

 

200mm.

 

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?

 

0.5mm.

 

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

 

200mm.

 

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?

 

98%.

 

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

 

98%.

 

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?

 

28days.

 

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

 

1.5mtr/minute.

 

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

 

30 degrees Celsius.

 

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

 

+_6mm.

 

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?

 

7days.

 

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?

 

75mm.

 

No.190 – Maximum size of  Sub Grade construction?

 

50mm.

 

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?

 

Compaction.

 

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.

 

If you want a PDF copy of this, Do let’s know by commenting & you can message us on our Instagram & telegram channel, or you can download it from the Free Download Category section of our website. 

 

Thanks For the Great Attention!

 

Good Bye & Take Care

 

Happy Learning 😆 

 

100 Interview Question Answers For Civil Engineers/Highway Engineers

 

 

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30 General Notes on Plumbing-Sanitary and Sewerage Work

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