Top 150+ Solved Irrigation Engineering MCQ Questions Answer
Q. When the upstream face of a gravity dam is vertical, then the intensity of water pressure atthe water surface and at the base respectively will be (where w is unit weight of water and H is the depth of water.)
a. 0 and wH212
b. wH2/2and wH2/3
c. wH and 0
d. OandwII
Q. The uplift pressure on a dam can be controlled byi) constructing cutoff under upstream faceii) constructing drainage channels bet-ween the dam and its foundationiii) by pressure grouting in foundationThe corret answer is
a. only (i)
b. both (i) and (ii)
c. both (i) and (iii)
d. (i), (ii) and (iii)
Q. The uplift pressure on the face of a drainage gallery in a dam is taken as
a. hydrostatic pressure at toe
b. average of hydrostatic pressure at toe and heel
c. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
d. none of the above
Q. Horizontal acceleration due to earthquake results in
a. hydrodynamic pressure
b. inertia force into the body of the dam
c. both (a) and (b)
d. none of the above
Q. Hydrodynamic pressure due to earthquake acts at a height of
a. 3H/47I above the base
b. 3H747t below the water surface
c. 4H/371 above the base
d. 4H737t below the water surface where H is the depth of water.
Q. The major resisting force in a gravity dam is
a. water pressure
b. wave pressure
c. self-weight of dam
d. uplift pressure
Q. When the reservoir is full, the maximum compressive force in a gravity dam is produced
a. at the toe
b. at the heel
c. within the middle third of base
d. at centre of base
Q. The maximum permissible eccentricity for no tension at the base of a gravity dam is
a. B/2
b. B/3
c. B/4
d. B/6
Q. Presence of tail water in a gravity dami) increases the principal stressii) decreases the principal stressiii) increases the shear stressiv) decreases the shear stressThe correct answer is
a. (i) and (iii)
b. (i)and(iv)
c. (ii) and (iii)
d. (ii) and (iv)
Q. For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)
a. 0.5 hw
b. 0.75 hw
c. 1.25 hw
d. 1.50 hw
Q. As compared to gravity dams, earthen dams
a. are costlier
b. are less susceptible to failure
c. require sound rock foundations
d. require less skilled labour
Q. The most suitable material for the central impervious core of a zoned embankment typedam is
a. clay
b. coarse sand
c. silty clay
d. clay mixed with fine sand
Q. Seepage through embankments in an earthen dam is controlled by
a. drainage filters
b. relief wells
c. drain trenches
d. provision of downstream berms
Q. Seepage through foundation in an earthen dam is controlled by providing
a. rock toe
b. horizontal blanket
c. impervious cut off
d. chimney drain
Q. The flow of water after spilling over the weir crest in chute spillway and side channelspillway respectively are
a. at right angle and parallel to weir crest
b. parallel and at right angle to weir crest
c. parallel to weir crest in both
d. at right angle to weir crest in both