61. Horizontal acceleration due to earthquake results in
hydrodynamic pressure ,inertia force into the body of the dam
62. Hydrodynamic pressure due to earthquake acts at a height of
4H/3π above the base
63. The major resisting force in a gravity dam is self-weight of dam
64. Total force due to wave action on a gravity dam acts at a height of
65. When the reservoir is full, the maximum compressive force in a gravity dam is
produced at the toe
66. The maximum permissible eccentricity for no tension at the base of a gravity dam is B/6
67. Presence of tail water in a gravity dam
decreases the principal stress,decreases the shear stress
68.Neglecting the effect due to earthquake forces and tail water pressure, the
principal stress in a gravity dam is given by
69.The elementary profile of a dam is a right angled triangle
70.In the empty condition of reservoir and with the elementary profile of a dam, the vertical stress at heel and toe respectively / are given by 2W/B and 0
71.Neglecting uplift pressure, the base width of an elementary profile of a gravity dam shall be taken as
72.The maximum possible height of a safe dam having an elementary profile is
f/W(G+1)
73. The focus of base parabola for a dam having a horizontal drainage filter is at a
distance of b from toe
74. By providing a top width for roadway and freeboard in the elementary profile of a gravity dam, the resultant force for full reservoir condition will
shift towards the heel
75. For wave action in dams, the maximum height of freeboard is generally taken to be equal to
76. As compared to gravity dams, earthen dams require less skilled labour
77. The most suitable materiarfor the central impervious core of a zoned embankment type dam is clay mixed with fine sand
78. Seepage through embankments in an earthen dam is controlled by
drain trenches
79. Seepage through foundation in an earthen dam is controlled by providing
impervious cut off
80. The flow of water after spilling over the weir crest in chute spillway and side
channel spillway respectively are at right angle and parallel to weir crest