# Geotechnical Engineering Questions and Answers – Shapes of Wells and Component Parts

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Shapes of Wells and Component Parts”.

1. 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.

2. 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.

3. ___________ 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.

4. 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.

5. What are the types of caissons that can be used as a foundation?
a) Box caissons and Open caissons
b) Closed caissons
c) None of the mentioned
d) All of the mentioned

Explanation: The caissons are of three types: i) Box caissons ii) open caissons iii) pneumatic caissons.
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6. Which of the following caissons, permits excavation in dry?
a) Pneumatic caissons
b) Box caissons
c) Open caissons
d) All of the mentioned

Explanation: A pneumatic caisson has its lower end designed as a working chamber in which compressed air is forced to prevent the entry of water and thus permit excavation in dry.

7. The sinking of the dredge is uniform in which of the following, shapes of well?
a) Double-D
b) Rectangular
c) Circular
d) Dumb-well

Explanation: As the perimeter of the circle is equidistant at all points from the center of the dredge hole, the sinking is more uniform than other shapes.

8. The components that are needed to be considered in designing of a well foundation is _______
a) Shape of the well
b) Sand filing
c) Bottom plug
d) Dredge hole

Explanation: The following components of a well have to be considered in the design of a well foundation: well curb cutting edge, steining, Bottom plug and well cap.

9. A disadvantage in using circular shape of well foundation is ___________
a) Minimum perimeter
b) Skin friction is maximum
c) Diameter of well is more than required
d) Sinking is more uniform

Explanation: The disadvantage of a circular well is that in the direction parallel to the span of the bridge, the diameter of the well is much more than the minimum size required.

10. The most economical shape, of a well for the construction of large pier is _________
a) Twin circular
b) Double-D
c) Rectangular
d) Single circular

Explanation: The dredge area for a double-D shape is smaller when compared to others; hence it can be more economical than a singular circular well.

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