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
0 h : 0 m : 1 s