Highway Engineering

121. If V is the design speed in km/hour and R is the radius of the curve of a hill road, the superelevation

  1. e = V / 127 R
  2. e = V2 / 127 R
  3. e = V 2/ 225 R
  4. e = V / 225 R

Correct answer: (C)
e = V 2/ 225 R

122. If V is the design speed of vehicles in km/hour, the change of radial acceleration in metres/sec3, is

  1. 65/(70 + V)
  2. 60/(70 + V)
  3. 70/(65 + V)
  4. 70/(60 + V)

Correct answer: (C)
70/(65 + V)

123. If V is the velocity in kmph, t the stopping distance S of the vehicle, is

  1. 0.28V2t + V/0.01
  2. 0.28Vt + V2/0.1
  3. 0.28Vt + 0.01
  4. 0.28Vt + 0.01 V2/

Correct answer: (C)
0.28Vt + 0.01

124. If W is the weight of a vehicle negotiating an upgrade 1 : S along a track having co-efficient of T is given by

  1. T = p / (μ + S)
  2. p = T / (μ + S)
  3. S = p / (μ + T)
  4. μ = p / (T + S)

Correct answer: (D)
μ = p / (T + S)

125. If x% is the gradient of an alignment and y% is the gradient after proper super-elevation along a curved portion of a highway, the differential grade along the curve, is

  1. (x + y) %
  2. (x - y) %
  3. (y - x) %
  4. (y + x) %

Correct answer: (C)
(y - x) %

126. In a braking test, a vehicle travelling at 36 km ph was stopped at a braking distance of 8.0 m. The average value of the vehicle's skid resistance (friction coefficient) is

  1. 0.64
  2. 6.25
  3. 0.16
  4. None of these

Correct answer: (C)
0.16

127. In a right angle bend of a road provided with a transition throughout, the maximum polar angle will be

  1. 10°
  2. 15°
  3. 20°
  4. 30°

Correct answer: (B)
15°

128. In an ideal transition curve, the radius of curvature

  1. Is constant
  2. At any point is directly proportional to its distance from the point of commencement
  3. Is inversely proportional to the radius of main curve
  4. Is directly proportional to the radius of main curve

Correct answer: (C)
Is inversely proportional to the radius of main curve

129. In case of a hair pin bend of a highway,

  1. Minimum radius of inner curve is 14 m
  2. Minimum radius of transition is 15 m
  3. Circular compound curve may be provided
  4. All the above

Correct answer: (D)
All the above

130. In case of a multi-lane road, overtaking is generally permitted

  1. From right
  2. From left
  3. From both sides right and left
  4. Not at all

Correct answer: (C)
From both sides right and left

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