Q3/Choose the correct answer 1. In general PSI for flexible pavement depend on........... Va. Cracking, Patching and Rutting b. Cracking and Patching c. Patching and Rutting d. Rutting 2. The Maximum contraction joint spacing for plain jointed concrete pavement is 3.5 m b. 4.5 m c. 5.5 m d. Depends on traffic load 3. The relationship between A psi and age of pavement is............ a. A psi o age A psi (1/age) c. A psi 02(1/age) d. Non of the above 4. The surface of the pavement should be a. Smooth b. Rough 5. Which type of aggregates gives good workability? a. Round b. Flaky c. Angular 6. Rutting may be avoided by a. Good compaction b. Good drainage 7. Bleeding may be avoided by a. Water voids Sufficient enough to resist skid b. Air voids c. Asphalt type 12. Tie bars in cement concrete pavements are at a. Expansion joints d. All the above acceptable c. High filler percent All the above 8. The good drainage in pavement can ca-increase the pavement life b. Decrease the pavement life c. Increase the pavem d. Decrease the pavement thickness 13. The weight of vehicles affects on d. Cubic 9. The function of an expansion joint in rigid pavements is to a. Relieve warping stresses b. Relieve shrinkage stresses c. Resist stresses due to expans. d. Allow free expansion e. All the above 10. The camber required depends on:- a. Type of pavement b. Rainfall c. Pavement thickness d. both (a and b) e. both (b and c) d. Stability X 11. Flexible pavement distribute the wheel load a. Directly to sub-grade b. Directly to subbase c. Through a set of layers to the sub-grade d. all the above Pavement thickness b. Number of lanes c. lane width 14. The maximum width of expansion joint in rigid pavements is a. 25 mm b. 2.5 in. c. 25 cm b. Contraction joints Longitudinal joints d. All the above d. All the above d. According to weight of vehicles x 15. According to Iraqi standard, the minimum compressive strength of concrete pavements, is d. According to pavement thickness a. 25 MPa b. c. 35 MPa