Highway engineering MCQ Questions and Answers

Highway Engineering MCQ 1

The type of transition curve that is generally provided on hill road is:

1. Circular
2. Cubic parabola
3. Lemniscate
4. Spiral

Answer: A. Reduction of duration for a few of the activities

Solution

Transition curve: Transition curve is the curve of varying radius. Transition curve is used to join the curve with the straight line for smooth movement of vehicle,

Transition curve is required for:

• Gradual introduction of centrifugal force on the vehicle
• Gradual introduction of superelevation on the curve
• Gradual introduction of centrifugal force on the vehicle

Types of transition curve: Spiral, Cubic parabola, and Bernoulli’s lemniscate.

According to IRC, the ideal shape of the transition curve is Spiral because in the spiral curve rate of change of radial acceleration is constant throughout the curve. On hilly terrain Spiral curve is generally used.

Note: Up to the deflection angle of 4o all the above described transition curves almost follow the same path.

Highway Engineering MCQ 2

Rodeway width for national highway and state highway (Two lanes) as per IRC is

1. 7.5 m
2. 10 m
3. 12 m
4. 15 m

Answer: A. 12 m

Solution

Rodeway width: Rodeway width is also known as width of formation. Rodeway width is the sum of width of pavement, width of separation and the width of shoulders. Width of formation does not include the width of extra land cutting.

Width of formation suggested by IRC:

Classification of road	Rode width in m
	Plain and rolling terrain	Hilly and Steep terrain
NH/SH	12	6.25-8.8
MDR	9	4.75
ODR	7.5-9.0	4.75
Village road	7.5	4

Hence, Rodeway width for National highway and State highway as per IRC is 12 m.

Highway Engineering MCQ 3

In a vertical curve, an upgrade of 2.5 % is followed by a downgrade of 2.5 %. The rate of change of grade is 0.08 % per 20 m chain. The length of vertical curve will be:

1. 850 m
2. 1000 m
3. 1250 m
4. 1500 m

Answer: A. 1250 m

Solution

Given,

N₁ = 2.5 % , N₂ = -2.5% And rate of change of grade = 0.08 % per 20 m chain

So, total change in gradient (N) = 2.5 – (-2.5) = 5%

Hence, Total length of vertical curve = 5/0.08×20=1250 m

Highway Engineering MCQ 4

Abrasion test is conducted to find

1. Hardness of aggregates
2. Strength of aggregates
3. Toughness of aggregates
4. Durability of aggregates

Answer: A. Hardness of aggregates

Solution

Various tests are being conducted to find out the properties such as Hardness, Crushing strength, Soundness etc. 

These tests are:

Abrasion test: Abrasion test are being conducted to find out the hardness of aggregates. Los Angeles Abrasion test is based on the percentage wear between aggregates when rubbing occurs between aggregate particles. Based on the abrasion value of aggregate, aggregates are selected to use.

Soundness test: Soundness test are carried out to know the weathering action of aggregates. Soundness test are carried out in the solution of sodium or magnesium sulphate.

Crushing test: Crushing test is carried out to determine the crushing strength of aggregates.

Aggregate impact test: Aggregate impact test are carried out to determine the toughness of aggregates.

Highway Engineering MCQ 5

Calculate the lag distance for design speed of 47 km/h for two way traffic on a single lane road (coefficient of friction, f =0.38 and reaction time for driver is 2.5 second).

1. 32.64 m
2. 111.04 m
3. 55.52 m
4. 65.33 m

Answer: D. 65.33 m

Solution

Lag distance: Lag distance is the distance travelled by vehicles before the application of break.

Lag distance can be calculated as l=0.278×V×t_r

Where, V= Velocity of vehicle in kmph and tr is the reaction time of the driver in second.

l=0.278×47×2.5=32.665 m

For single lane two way traffic lag distance should be sum of lag distance of vehicles coming in both directions

Hence, lag distance = 32.665+32.665=65.33 m

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