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291.

In a Buttress dam, when the height of dam is 10 m to 25 m, the spacing of buttress is usually restricted to

292.

In Buttress dam the column or slenderness ratio is usually maintained between

293.

The arch dam is not suitable for

A.	Narrow sites	B.	Wider sites
C.	Small discharge	D.	Low heads
E.	Small discharge and low heads

294.

In case of Constant Angle Arch Dam, the most favourable central angle is

295.

The magnitude of earthquake pressure on a dam varies as a function of

A.	Frequency of vibration	B.	Amplitude
C.	Frequency of vibration and amplitude	D.	Amplitude and intensity
E.	Richard's scale number

296.

The simplest type of controls for reservoir outlets is provided by

297.

In order to keep out debris and other materials carried by water which are likely to damage turbine, provision is made by

298.

Rocks which contain neither joints nor hair cracks, are known as

299.

Rocks with excessive internal stresses which may cause spalling are known as

300.

Rocks that undergo notable expansion without flow due to preence of clay minerals, are known as