Quiz : 5 – Highway Engineering (Part-II)

 

 

1. The speed and delay studies on a defined section of highway are conducted by

a) radar gun

b) traffic counters

c) moving car method

d) enoscope

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2. Two major roads with two lanes each are crossing in an urban areas to form an uncontrolled intersection. The number of conflict points when both roads are one way is “X” and when both roads are two-way is “Y”. The ratio of X to Y is

a) 0.25

b) 0.33

c) 0.50

d) 0.75

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3. A two-lane urban road with one-way traffic has a maximum capacity of 1800 vehicles/hour. Under the jam condition, the average length occupied by the vehicles is 5.0 m. The speed versus density relationship is linear. For a traffic volume of 1000 vehicles/hour, the density (in vehicles/km) is

a) 52

b) 58

c) 67

d) 75

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4. The penetration test for bitumen is conducted at a temperature of

a) 60°C

b) 37°C

c) 25°C

d) 50°C

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5. In the Marshall method of mix design, the coarse aggregates, fine aggregates, filler and bitumen, having respective specific gravities of 2.62, 2.72, 2.70 and 1.02 are mixed in the ratio of 55, 34.6, 4.8 and 5.6 percent, respectively. The theoretical specific gravity of the mix would be

a) 2.36

b) 2.40

c) 2.44

d) 2.50

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6. It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent. Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cummulative standard axles (msa) computed are

a) 35

b) 37

c) 65

d) 70

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7. The Modulus of Subgrade Reaction is evaluated from

a) plate bearing test

b) CBR test

c) direct shear test

d) triaxial test

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8. In a cement concrete pavement dowel bars are used in

a) longitudinal joints

b) construction joints

c) dummy joints

d) expansion joints

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9. The width of expansion joint gap is 2.5 cm in a cement concrete pavement. The spacing between expansion joint for a maximum rise in temperature of 25°C is, (Assuming coefficient of thermal expansion of concrete as 10 x 10-6 per degree C)

a) 5 m

b) 50 m

c) 100 m

d) 25 m

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10. A subgrade soil sample was tested using standard CBr apparatus and the observations are given below.

 

 

 

 

Assuming theat the load-penetration curve is convex throughout, the CBR value (%) of the sample is

a) 6.5

b) 5.5

c) 4.4

d) 3.9

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