National Highways Authority of India Interview Questions and Answers

A transition curve is a curve that connects a straight line with a circular curve in a smooth and gradual manner.

• Transition curves are used in civil engineering and transportation design to ensure smooth transitions between different types of curves.

• They are typically used in road design, railway tracks, and pipelines.

• The purpose of a transition curve is to reduce the abrupt change in curvature, which helps in imp...read more

Various tests are conducted on cement, concrete, aggregates, and bitumen to ensure their quality and durability.

• Cement tests include fineness, setting time, compressive strength, and soundness tests.

• Concrete tests include slump test, compressive strength test, and water absorption test.

• Aggregates tests include sieve analysis, specific gravity, and water absorption test.

• Bitumen tests include penetration test, softe...read more

Proper planning, pruning, fertilization, and pest control are essential for managing tree and shrub plantations.

• Regular pruning to remove dead or diseased branches

• Fertilization to ensure healthy growth

• Pest control measures to prevent infestations

• Proper spacing and planting techniques to avoid overcrowding

• Regular monitoring and maintenance

• Use of appropriate tools and equipment

• Training and education of staff

• Implemen...read more

While designing an expressway, safety, efficiency, and environmental impact must be considered.

• Consider the traffic flow and capacity needed

• Ensure proper signage and lighting for safety

• Incorporate measures to reduce environmental impact

• Consider the terrain and potential hazards

• Ensure proper drainage and maintenance

• Consult with experts in civil engineering and transportation planning

Field tests are performed to measure the strength and deflection of pavement surfaces.

• Field tests involve using specialized equipment to measure the pavement's response to a load.

• One common test is the Falling Weight Deflectometer (FWD), which drops a weight onto the pavement and measures the resulting deflection.

• Other tests include the Benkelman Beam and the Dynaflect.

• Deflection is a measure of how much the pavem...read more

Doubling of railway line involves constructing a parallel track to increase capacity and improve efficiency.

• Doubling of railway line is done to increase capacity and improve efficiency of the railway network.

• It involves constructing a parallel track next to the existing track.

• This allows for more trains to run simultaneously without causing delays.

• Examples of successful doubling projects include the Western Dedica...read more