Pavement Design Mid - I, September - 2014

1.What is the equivalent single wheel load of a dual wheel assembly carrying 20,440 N each for pavement thickness of 20cm?
  • 27,600N
  • 32,300N
  • 40,880N
  • 30,190N
Answer: D
2.The main cause of rattling below the flexible pavement is=________
  • Vehicular traffic
  • absence of surface drainage
  • Improper mix of pavement
  • consolidation of one or more layers of pavement
Answer: D
3.What is the thickness of a drainage layer if the coefficient of permeability of the drainage layer material (classified as GP) = 42.5 m/day, quantity of sub-surface water to be removed = 0.18m3 /day/m2 and slope in the direction of flow of water = 2%.
  • 150mm
  • 200mm
  • 211mm
  • 300mm
Answer: C
4.__________________ is used to measure vertical stresses under HVS type loading
  • SOPT
  • PAST
  • DCP
  • None
Answer: A
5.The _________________ is used to measure load associated crack movements on a pavement surface roughness statistic index
  • Roughness static index
  • Crack activity meter
  • Dynamic cone Penetrometer
  • Pavement strain transder
Answer: B
6.What is the intensity of vertical pressure due to point load of 4200kg at a depth of 4m from the surface and a distance of 2m from the axis of loading?
  • 71.74 kg/m2
  • 60.74 kg/m2
  • 50.74 kg/m2
  • 80.74 kg/m2
Answer: A
7.What is the relative vertical displacement at a joint when 2 cm of vertical error is observed during installation of 50 cm length dowel bars and the expansion joint movement is 1.75 cm
  • 0.8 cm
  • 0.07 cm
  • 7 cm
  • 8 cm
Answer: B
8.What is the total deflection across a dowel joint when the load transferred =1500kg, width of joint = 2cm, Elastic modulus of dowel bar = 20.1x105 kg/cm2, Moment of inertia of dowel bar = 1.917 cm4 and relative stiffness of an embedded dowel bar = 0.2864 per cm
  • 29 cm
  • 0.29 cm
  • 0.029 cm
  • 0.0029 cm
Answer: B
9.Constructs joints are transverse joints used to relieve _______________ stresses
  • Compressive
  • Tensile
  • a&b
  • None
Answer: B
10.The design for pavement concrete is based on
  • Flexural strength
  • Characteristic compressive strength
  • Shear strength
  • Bond strength
Answer: A
11.The number of load cycles (Nl) to cause the failure of a pavement is proportional to = ____________
Answer: 1/P
12.The distance between a critical point near the pavement surface to an entry point of inlet is 400m and the level difference between the critical point to the point of entry of inlet is 10m. The time of concentration is =______________
Answer: 8.13 min
13.The ratio between change in force and the corresponding change in displacement is called=_______
Answer: Stiffness
14.The half car roughness index (HRI) (m/km) is equal to the =__________ times of IRI (m/km).
Answer: 0.89
15._______________ is a system in which mutual forces develop between the vehicle tyre and the pavement
Answer: Vehicle pavement interaction
16.The value of the stiffness modulus (Ebit (t, T) of bitumen may be expressed as = _____________at (t, T)
Answer: Stress/strain
17.Bitumen becomes hard and soft by cooling and heating respectively, these states of bitumen may reversed as and when required, the property of bitumen is known as =___________________
Answer: Thermo-plasticity
18.A slab is 4.5 m length and 3.5 m width, the elastic modulus of concrete is 3x104 MPa, temperature difference between the top and bottom surface of the slab is 17° c, coefficient of thermal expansion concrete is 10x10-6 per°c, Cx = 0.6892 is the wrapping stress at the edge = ____________
Answer: 1.757MPa
19.The joints are provided in concrete pavements to reduce the cracks due to the change in =_________
Answer: Temperature or moisture
20.The modulus of subgrade reaction is evaluated from=_____________
Answer: Plate bearing test