1. Which of the following pile is used, when the ground is soft?
a) Franki pile
b) Simplex pile
c) Vibro-piles
d) Pedestal piles
Explanation: Vibro-piles are used where the ground is shaft, thus offering little frictional resistance to the flow of concrete.
2. The bearing capacity of vibro-pile can be increased by ________
a) Increasing its diameter
b) Elongation of the pile
c) By using cone-shape base at the bottom
d) By adding more load
Explanation: The bearing capacity of vibro-expanded piles is increased by enlarging its diameter at the bottom.
3. If tamping of concrete is provided at regular intervals in a simplex pile, it is called as ________
a) Simplex standard pile
b) Simplex tamped pile
c) Tamped standard pie
d) None of the mentioned
Explanation: In a simplex tamped pile, tamping of green concrete is done after the casing is withdrawn, at regular intervals
4. The base of an vibro-pile should be in the shape of ___________
a) Conical shoe
b) Mushroom
c) Sphere
d) Rectangle
Explanation: The bottom of a vibro-pile is provided with a conical shoe so that it can be easily driven up to the desired depth
5. In which of the following piles, alligator jaw point can be used?
a) Vibro-pile
b) Pedestal pile
c) Franki pile
d) Simplex pile
Explanation: In simplex pile if the soil is firm enough to stand, the cast iron shoe at the base is provided with alligator jaw point.
6. Franki piles are best suited for _________ type of soil.
a) Cohesive soil
b) Clay
c) Granular soil
d) Cohesion less soil
Explanation: Franki pile is more useful where a bearing stratum of limited thickness can be reached at a reasonable depth, so they are best suited for the granular type of soil
7. The common types of well shape are _________
a) Rectangular
b) Dumb bell
c) Single circular
d) All of the mentioned
Explanation: The common types of well shapes are: i) single circular ii) Twin circular iii) Dumb-well iv) Double-D v) Twin-hexagonal vi) Twin-octagonal vii) Rectangular.
8. Well are also called as __________
a) Open caissons
b) Shell sunk
c) Caisse
d) All of the mentioned
Explanation: Open caissons (“caisson” a French word) are called as wells.
9. ___________ forms the most common type of deep foundation for bridges.
a) Pile foundation
b) Well foundation
c) Shallow foundation
d) Pier foundation
Explanation: In India, well foundation forms the most common type of deep foundation for bridges.
10. The choice of a particular shape for a well depends on ________
a) Dimension of the base and Cost of sinking
b) Type of soil condition
c) None of the mentioned
d) All of the mentioned
Explanation: The choice of a particular shape of well depends upon the dimension of the pier or abutment, the care and cost of sinking, the considerations of the tilt and shift during the sinking.