Questions and answers for exam Preparation

MCQs

Total Questions : 153 | Page 13 of 16 pages

Question 121. What is the most critical condition of slide of the U/s slope?

The sudden drawdown of the reservoir
Reservoir full condition
Steady seepage condition
Sudden drawdown and reservoir full condition

Discuss Question

Answer: Option A. -> The sudden drawdown of the reservoir
Answer: (a).The sudden drawdown of the reservoir

Question 122. When the reservoir is full, the slope which is most likely to slide is _____________________

the upstream slope
the downstream slope
both upstream and downstream slope
no effect

Discuss Question

Answer: Option B. -> the downstream slope
Answer: (b).the downstream slope

Question 123. In order to keep the saturation line in a canal embankment well within the toe, it is necessary to provide _____________________

spoil bank
counter berm
freeboard
berm

Discuss Question

Answer: Option B. -> counter berm
Answer: (b).counter berm

Question 124. Which of the following failures generally occur due to the development of unaccounted pore pressures?

Hydraulic failures
Piping through the dam body
Sliding in embankments
Sloughing of the d/s toe

Discuss Question

Answer: Option C. -> Sliding in embankments
Answer: (c).Sliding in embankments

Question 125. Which of the following method is also called as the Slices method?

Fellenius method
Swedish slip circle method
Bishop’s simplified method
Spencer’s method

Discuss Question

Answer: Option B. -> Swedish slip circle method
Answer: (b).Swedish slip circle method

Question 126. In Fellenius method for small values of angle of internal friction of soil, the critical arc passes ________________

through the toe of the slope
above the toe of the slope
below the toe of the slope
anywhere near the toe of the slope

Discuss Question

Answer: Option C. -> below the toe of the slope
Answer: (c).below the toe of the slope

Question 127. Calculate the maximum shear-stress induced if the horizontal average shear stress induced in u/s portion of the dam at the base is 36.45 kN/m².

43.74 kN/m²
47.38 kN/m²
51.03 kN/m²
54.67 kN/m²

Discuss Question

Answer: Option C. -> 51.03 kN/m²
Answer: (c).51.03 kN/m²

Question 128. A rock toe and a horizontal filter is provided on the downstream base of an earthen dam in order to _________________

prevent piping action in the dam body
prevent piping action in the dam foundation
reduce the seepage quantity by blocking its flow
collect and drain out the seepage flow

Discuss Question

Answer: Option D. -> collect and drain out the seepage flow
Answer: (d).collect and drain out the seepage flow

Question 129. What is the correct expression of equivalent liquid unit weight?

ϒeq.tan² [45 – Φ/2]
ϒeq.tan² [45 + Φ/2]
ϒeq.tan [45 – Φ/2]
ϒeq.tan [45 + Φ/2]

Discuss Question

Answer: Option A. -> ϒeq.tan² [45 – Φ/2]
Answer: (a).ϒeq.tan² [45 – Φ/2]

Question 130. Calculate the factor of safety at the point of maximum shear if unit shearing resistance is 97.9 kN/m² and the maximum shear-stress induced is 55.72 kN/m². Check whether the dam is safe or unsafe.