Highway planning miscellaneous

Highway planning miscellaneous

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Highway Planning

Highway planning miscellaneous
  1. The plate load test conducted with a 75 cm diameter plate on soil subgrade yielded a deflection of 2.5 mm under a stress of 800 N/cm2. The modulus of elasticity of the subgrade soil, in kN/cm2, is








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    E =
    1.18 × Pa
    δ


    = 1.18 × 800 ×
    75
    2
    0.25

    = 141.6 kN/cm2

    Correct Option: A

    E =
    1.18 × Pa
    δ


    = 1.18 × 800 ×
    75
    2
    0.25

    = 141.6 kN/cm2

  1. In the Marshal 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 resp. The theorotical specific gravity of the mix would be








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    G =
    100
    55
    		 +
    34.6
    		 +
    4.8
    		 +
    5.6
    2.622.722.71.02

    = 2.44

    Correct Option: C

    G =
    100
    55
    		 +
    34.6
    		 +
    4.8
    		 +
    5.6
    2.622.722.71.02

    = 2.44

  1. A car is moving at a speed of 72 km/hr on road having 2% upward gradient. The driver applies brakes when he sees an obstruction. If his reaciton time is 1.5 seconds, assuming that the co-efficient of friction between the pavement and tyre as 0.15, calculate the distance traversed before the car finally stops.








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    SSD = vt +
    v2
    		 (v in m / s)
    2g(f + 0.01n)

    = 0.278 vt +
    v2
    254(f + 0.01n)

    = 0.278 × 72 × 1.5 +
    (72)2
    		 = 150 m
    254(0.15 + 2 × 0.01)

    Correct Option: B

    SSD = vt +
    v2
    		 (v in m / s)
    2g(f + 0.01n)

    = 0.278 vt +
    v2
    254(f + 0.01n)

    = 0.278 × 72 × 1.5 +
    (72)2
    		 = 150 m
    254(0.15 + 2 × 0.01)

  1. The radius of relatives stiffness for a 20 cm thick slab with E = 3 × 105 kg/cm2 and poisson’s ratio = 0.15, resting on subgrade having modulus of 5 kg/cm3 is








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    NA

    Correct Option: B

    NA

  1. A valley curve has a descending gradient of 1 in 40 followed by an ascending gradient of 1 in 50. The length of the valley curve required for a design speed of 80 km/hour for comfort condition is








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    NA

    Correct Option: C

    NA