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A __________ are open at bottom and closed at top.

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in Construction & Building Materials by (190k points)
A __________ are open at bottom and closed at top.

(a) Cylinders

(b) Wells

(c) Box Caisson

(d) Pneumatic caissons

I got this question in exam.

My question comes from Classification of Caissons in portion Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Right choice is (d) Pneumatic caissons

The explanation is: The pneumatic caissons are adopted when the depth of water is more than 12 metres or so. The maximum depth of water upto which pneumatic caissons can be used is limited from the consideration of health of the workers.

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