Questions and answers for exam Preparation

MCQs

Total Questions : 88 | Page 1 of 9 pages

Question 1. The allowable maximum negative head on an average is equal to __________

2.5 m or so
5 m or so
7.5 m or so
10 m or so

Discuss Question

Answer: Option C. -> 7.5 m or so
Answer: (c).7.5 m or so

Question 2. Morning glory is the _____________________________

special flared inlet of the shaft spillway of a dam of very small height
special flared inlet of the shaft spillway of a large dam project
a horizontal tunnel constructed in a shaft spillway across the body of a gravity dam to carry surplus reservoir water to the d/s river
a horizontal tunnel constructed in a shaft spillway of an earthen dam through its foundation to carry surplus reservoir water to the d/s river

Discuss Question

Answer: Option B. -> special flared inlet of the shaft spillway of a large dam project
Answer: (b).special flared inlet of the shaft spillway of a large dam project

Question 3. A siphon spillway is sufficiently independent of the water surface elevation of the reservoir.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 4. The structure which is not used in a shaft spillway is ________________

tunnel
bridge
radial gates
radial piers

Discuss Question

Answer: Option C. -> radial gates
Answer: (c).radial gates

Question 5. For a saddle siphon, the maximum operative head is 4.53 m. The width and height of the throat of the siphon are 5 m and 2.25 m respectively. The coefficient of discharge is 0.90. How many units are required to pass a flood of 350 cumecs? (Assume g = 10 m/s2)

One
Two
Three
Four

Discuss Question

Answer: Option D. -> Four
Answer: (d).Four

Question 6. A siphon spillway in a concrete gravity dam is in the shape of ________________

U-shape
Inverted U-shape
Horizontal bend through the abutment
Any straight line

Discuss Question

Answer: Option B. -> Inverted U-shape
Answer: (b).Inverted U-shape

Question 7. The energy dissipation at the toe of the spillway is affected basically by the use of hydraulic jump in _______________________

roller bucket
a ski-jump bucket
a sloping apron below the downstream river bed
both roller and ski-jump bucket

Discuss Question

Answer: Option C. -> a sloping apron below the downstream river bed
Answer: (c).a sloping apron below the downstream river bed

Question 8. When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

a roller bucket
a ski-jump bucket
either roller or ski-jump bucket
a sloping apron

Discuss Question

Answer: Option B. -> a ski-jump bucket
Answer: (b).a ski-jump bucket

Question 9. The most ideal condition for energy dissipation in the design of spillways is the one when the tail-water rating curve coincides with the jump rating curve at all discharge.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 10. The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is ________________