CEP423 Quiz No. 3 PDF

QUIZ NO. 3 CEP423 – Principles of Transportation Engineering SET A Directions: Read all items carefully and select the letter that best describes the answer. 1. The part of the road that carries the traffic and has a set of layers or material placed over the natural ground (subgrade). a. Pavement b....

QUIZ NO. 3 CEP423 – Principles of Transportation Engineering SET A Directions: Read all items carefully and select the letter that best describes the answer. 1. The part of the road that carries the traffic and has a set of layers or material placed over the natural ground (subgrade). a. Pavement b. Dowel Bars c. Subgrade d. Joints 2. Joints placed in concrete pavements, which are placed transversely across the pavement width to provide suitable transition between concrete placed at different times or on different days. a. Expansion Joint b. Contraction Joint c. Construction Joint d. Isolation Joint 3. Type of pavement that is constructed with Portland cement concrete. a. Flexible Pavement b. Rigid Pavement c. Perpetual Pavement d. Pervious Pavement 4. The critical section of a contraction joint is located at a. the edge and will crack approximately 30°. b. the center and will crack approximately 45°. c. the center and will crack approximately 35°. d. the edge and will crack approximately 45°. 5. The modulus of subgrade involves is dependent on a. Load and Pressure b. Pressure and Deflection c. Load and Deflection d. None of the Given Choices 6. The maximum safe speed on roads, depends on the a. Type of Road Surface b. Type of Curves c. Sight Distance d. All of the Above 7. The basic formula for determination of pavement thickness was first suggested by a. Spanglar b. Goldbeck c. Picket d. Kelly 8. The weight of vehicles primarily affects the design of the following except a. Pavement Thickness b. Ruling Gradient c. Lane Width d. Limiting Gradient 9. Cement grouted pavement is classified as a. Rigid Pavement b. Semi-Rigid Pavement c. Flexible Pavement d. None of these 10.Minimum thickness of the base of a flexible pavement, is a. 100 mm b. 150 mm c. 200 mm d. 250 mm 11.Newly constructed pavement with ordinary Portland cement attains its working strength after a. 7 days b. 14 days c. 21 days d. 28 days 12.Bottom-most component of a flexible pavement, is called a. Base b. Base Course c. Subgrade d. Sub-base 13.Pavement is said to be flexible if it contains a. lean concrete base. b. bitumen-bound stone layer of varying aggregates. c. stabilized soil base constructed of lime cement or tar. d. All of the Above 14.An ideal pavement is constructed with a. Bricks b. Hard Soil c. Portland Cement Concrete d. Tar 15.For a poorly graded sub-grade soil, thickness of sub-base, is a. 150 mm b. 200 mm c. 250 mm d. 300 mm For Items 16-20, identify the following type of intersection and highway: 16.The figure shown is a type of fully directional interchange which is a. Three-Level Directional Interchange b. Four-Level Directional Interchange c. Two-Level Directional Interchange d. Level Directional Interchange 17.A type of interchange which is sometimes called a high-speed interchange is: a. Diamond Interchange b. Trumpet c. Y-Type Interchange d. Clover Leaf 18.The figure shown is a type of 4-leg intersection known as: a. Unchannelized b. Flared c. Channelized d. Multileg 19.The figure shown is a type of freeway interchanges known as: a. T-interchange b. Y-interchange c. Flyover with round-about d. Trumpet Interchange 20.An at-grade intersection in which the number of traffic lanes or the pavement width exceeds the normal number of lanes or the normal width of the approach roadways. a. Unchannelized Intersection b. Flared Intersection c. Channelized Intersection d. Multileg Intersection 21.A flexible pavement having a thickness of 46mm carries a static wheel load of “W”. The circular contact area of time has an equivalent radius of 150mm. If the load “W” is assumed to be transmitted across a wide area of subgrade at an angle of 45°, Determine the value of the wheel load “W” in kN if the bearing stress of the base is 0.42 MPa. a. 55.09 b. 50.72 c. 61.28 d. 58.19 22.Determine the spacing between construction joints for 4 m. slab width having thickness of 150 mm, coefficient of frictions is 1.5. Allowable tensile stress in concrete and steel are 0.6 kg/cm2 and 2400 kg/cm2, respectively. Use plain cement concrete. a. 4.44 m. b. 4.40 m. c. 3.33 m. d. 3.30 m. 23.Determine the modulus of subgrade reaction in kN/m3 if a plate of 500 mm in diameter was deflected 5 mm by a 30 kN load. a. 30557.75 b. 62432.42 c. 56671.69 d. 40929.58 24.A pavement slab 15 m. wide and 200 mm. thick is laid in three strips, each 5 m. wide. The coefficient of friction between pavement and subgrade is 1.50, allowable tensile stress in steel is 138 MPa and the allowable bond stress between concrete and steel is 0.82 MPa. Determine the spacing of 16 mm round tie bars. a. 842 mm b. 726 mm c. 866 mm d. 786 mm 25.A pavement slab 15 m. wide and 200 mm. thick is laid in three strips, each 5 m. wide. The coefficient of friction between pavement and subgrade is 1.50, allowable tensile stress in steel is 138 MPa and the allowable bond stress between concrete and steel is 0.82 MPa. Determine the length of 16 mm round tie bars. a. 1284 mm b. 1346 mm c. 1452 mm d. 1638 mm 26.The thickness of a granular base was found to be 8.80 inches. The result of the plate bearing test showed that a pressure of 40 psi leads to a deflection of 0.18 in of a 30 inches diameter plate. If a flexible runway pavement is to be designed for a deflection of 0.5 with a tire pressure of 120 psi, determine the amount of single wheel load using Mcleod’s method with k=50 for the actual contact area and a conversion factor of 2 for a subgrade pressure corresponding to the actual contact area and deflection of 0.5 in. a. 45,000 lb. b. 40,000 lb. c. 35,000 lb. d. 30,000 lb. 27.Determine the thickness of the edge of a rigid pavement of the proposed Nagtahan road to carry a max. wheel load of 80kN, considering the effects of dowels or tie bars. fc’=21MPa while the allowable tensile stress of concrete pavement is 0.06fc’. a. 463.44 mm. b. 75.59 mm. c. 106.90 mm. d. 308.61 mm. 28.Compute the pavement thickness by expansion pressure method, if the expansion pressure is 0.250 kg/cm^2 and the average pavement density is 0.0030 kg/cm^2. a. 83.33 cm b. 73.33 cm c. 63.33 cm d. 53.33 cm 29.The total material required for an embankment is 100 cubic meters. The borrowed material will be obtained from a pit that has an in-situ void ratio of 0.75 and void ratio of 0.50 after compaction. How much material must be excavated? a. 83.33 cubic meters b. 116.67 cubic meters c. 112.33 cubic meters d. 87.67 cubic meters 30.Determine the thickness of the center of a rigid pavement of the proposed Nagtahan road to carry a max. wheel load of 80kN, considering the effects of dowels or tie bars. fc’=21MPa while the allowable tensile stress of concrete pavement is 0.06fc’. a. 463.44 mm. b. 218.22 mm. c. 106.90 mm. d. 308.61 mm.