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Irrigation Engineering
Advanced Irrigation Engineering
Quiz 1
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Q.1
The vertical component of the earthquake wave which produces adverse effects on the stability of a dam when is acting in ____________________
a) upward direction
b) downward direction
c) both upward and downward direction
d) any direction
Q.2
The horizontal component of an earthquake wave producing instability in a dam is the one which acts __________________
a) towards the reservoir
b) towards the dam
c) away from the reservoir
d) away from the dam
Q.3
The vertical downward earthquake acceleration av = 0.acting on a gravity dam will ________________________
a) increase the resisting weight of the dam by 10%
b) decrease the resisting weight of the dam by 10%
c) increase the uplift by 10%
d) decrease the uplift by 10%
Q.4
A gravity dam is subjected to hydrodynamic pressure caused by __________
a) the rising waves of the reservoir when a flood wave enters into it
b) the rising waves in the reservoir due to high winds
c) the increase in water pressure momentarily caused by the horizontal earthquake acting towards the reservoir
d) the increase in water pressure momentarily caused by the horizontal earthquake acting towards the dam
Q.5
In a concrete gravity dam with a vertical upstream face the stabilising force is provided by the ___________________
a) weight of the dam
b) the water supported against the upstream slope
c) uplift pressure
d) water pressure at the tail end
Q.6
What is the value of horizontal destabilizing force caused by the formation of waves in a storage reservoir having a fetch ofkm due to high wind ofkm/h?
a) 30 KN
b) 60 KN
c) 130 KN
d) 180 KN
Q.7
Calculate the value of free-board that should be provided for a reservoir having a wind velocity ofkm/h and it extends up tokm upstream.
a) 1.2 m
b) 1.6 m
c) 2.25 m
d) 2.5 m
Q.8
The upward acceleration of dam due to seismic activity will ________________________
a) increase the base pressure
b) decrease the base pressure
c) not affect the effective weight of the dam
d) increase the horizontal dynamic force
Q.9
What is the average value of acceleration that is sufficient for high dams in seismic zones?
a) 0.1g to 0.15g
b) 0.05g to 0.1g
c) 0.3gs
d) 0.15g (where g is the acceleration due to gravity)
Q.10
What is Von Karman’s formula for hydrodynamic force (Pe)?
a) Pe = 0.726 pe H
b) Pe = 0.424 pe H
c) Pe = 0.555 pe H
d) Pe = 0.555.Kh. Yw H2
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