L. N. Malviya Infra Projects Group Assistant Highway Engineer Interview Questions, Process, and Tips

Q1. What is required slum for PQC?
Ans. 
Slump is the required consistency of PQC (Pavement Quality Concrete) for proper construction.
• The required slump for PQC typically ranges from 20-40 mm.

• Slump test should be conducted at the site to ensure the correct consistency.

• Proper slump ensures good workability and strength of the concrete.

• If the slump is too high, it may lead to segregation and bleeding issues.

• If the slump is too low, it may result in difficulty i
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Q2. What is laying temprature for DBM?
Ans. 
The laying temperature for DBM (Dense Bituminous Macadam) typically ranges from 140 to 160 degrees Celsius.
• Laying temperature for DBM is crucial for achieving proper compaction and bonding of the material.

• The temperature range of 140-160 degrees Celsius ensures that the DBM is workable and can be compacted effectively.

• Excessive heat can lead to premature cooling and inadequate compaction, while lower temperatures may r...read more
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Q3. What is the maximum thickness of a layer?
Ans. 
The maximum thickness of a layer in highway engineering is typically around 300 mm.
• Maximum thickness is usually limited to around 300 mm for practical and cost-effective reasons

• Thicker layers may lead to excessive settlement or instability

• Thinner layers may not provide adequate strength or durability

• Examples: Base course layer in flexible pavement is typically around 150-300 mm thick
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Q4. What is the maximum speed of a compactor
Ans. 
The maximum speed of a compactor varies depending on the type and model, but typically ranges from 2 to 6 miles per hour.
• The maximum speed of a compactor is usually between 2 to 6 miles per hour.

• The speed can vary based on the type of compactor (e.g. vibratory, smooth drum) and the model.

• Higher speed compactors are often used for larger projects where efficiency is key.

• Lower speed compactors are used for more precise c
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Q5. What should be the maximum speed of paver during DBM LAYING?
Ans. 
The maximum speed of paver during DBM laying should be around 2-3 km/h to ensure proper compaction and quality of the road surface.
• The maximum speed of the paver should be controlled to allow for proper compaction of the DBM layer.

• Excessive speed can lead to inadequate compaction, resulting in a weaker road surface and potential future issues.

• A speed of 2-3 km/h is generally recommended for DBM laying to achieve optima...read more
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Q1. What is your name
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Q2. What is the bitumen percentage in DBM
Ans. 
The bitumen percentage in Dense Bituminous Macadam (DBM) typically ranges from 5-7%.
• Bitumen percentage in DBM is usually around 5-7%

• The exact percentage may vary based on the specific mix design and project requirements

• Higher bitumen content provides better durability and resistance to weathering

• Lower bitumen content may result in a more rigid mix but may be prone to cracking

• Proper testing and quality control measures ...read more
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Basic knowledge of IQ and quantitative and basic reasoning.

Q1. Basic to advanced knowledge about civil engineering Highway, transportation.
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Q1. Personal details and salary discussion
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Q1. Tell me about yourself
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Q2. When did you complete your Degree
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Q1. What was the thickness of different layer in your last project?
Ans. Sub grade-500mm, WMM-200mm,DLC-150mm,Sand-10mm, Plastic sprater-100micron thick, PQC-360mm.
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Q2. How do you laying pqc?
Ans. 
PQC laying refers to the process of laying a Pavement Quality Concrete (PQC) layer on a highway.
• Prepare the subgrade by compacting and leveling the surface.

• Place a layer of granular sub-base material and compact it.

• Construct the edge forms to define the boundaries of the PQC.

• Pour the PQC mix onto the prepared surface and spread it evenly.

• Use a paver machine or manual methods to level and compact the PQC.

• Cure the PQC by...read more
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Q3. Which Company Paver do you use?
Ans. 
I have experience working with various pavers including Caterpillar, Volvo, and Dynapac.
• I have used Caterpillar pavers on a highway resurfacing project in my previous job.

• I have also worked with Volvo pavers on a bridge construction project.

• Dynapac pavers were used on a road widening project that I was a part of.

• I am familiar with the features and capabilities of each of these pavers.
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Q4. Writgen company paver
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