51. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be
a) 0 and wH212
b) wH2/2and wH2/3
c) wH and 0
d) OandwII
where w is unit weight of water and H is the depth of water.
Ans: d
52. The uplift pressure on a dam can be controlled by
i) constructing cutoff under upstream face
ii) constructing drainage channels bet-ween the dam and its foundation
iii) by pressure grouting in foundation
The corret answer is
a) only (i)
b) both (i) and (ii)
c) both (i) and (iii)
d) (i), (ii) and (iii)
Ans: d
53. 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
Ans: c
54. 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
Ans: c
55. 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.
Ans: c
56. The major resisting force in a gravity dam is
a) water pressure
b) wave pressure
c) self-weight of dam
d) uplift pressure
Ans: c
57. 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
Ans: a
58. 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
Ans: d
59. Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans: d
60. For wave action in dams, the maximum height of freeboard is generally taken to be equal to
a) 0.5 hw
b) 0.75 hw
c) 1.25 hw
d) 1.50 hw
where hw is height of wave.
Ans: d
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a) 0 and wH212
b) wH2/2and wH2/3
c) wH and 0
d) OandwII
where w is unit weight of water and H is the depth of water.
Ans: d
52. The uplift pressure on a dam can be controlled by
i) constructing cutoff under upstream face
ii) constructing drainage channels bet-ween the dam and its foundation
iii) by pressure grouting in foundation
The corret answer is
a) only (i)
b) both (i) and (ii)
c) both (i) and (iii)
d) (i), (ii) and (iii)
Ans: d
53. 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
Ans: c
54. 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
Ans: c
55. 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.
Ans: c
56. The major resisting force in a gravity dam is
a) water pressure
b) wave pressure
c) self-weight of dam
d) uplift pressure
Ans: c
57. 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
Ans: a
58. 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
Ans: d
59. Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans: d
60. For wave action in dams, the maximum height of freeboard is generally taken to be equal to
a) 0.5 hw
b) 0.75 hw
c) 1.25 hw
d) 1.50 hw
where hw is height of wave.
Ans: d
More Irrigation water resources engineering Questions & Answers:-
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