218. Equation of continuity of flow is based on the principle of conservation of (where Re = Reynolds number).

A.Mass

B.(c) momentum

C.(a) Re

D.(c) Re1/2

219. Bernoulli's theorem deals with the conservation of

A.Mass

B.(c) momentum

C.(b) force

D.Energy

220. An air vessel is usnally provided at the summit of a syphon in order to

A.Regulate the flow

B.Increase discharge

C.Avoid interruption in flow

D.Increase velocity

221. The flow at critical depth in an open channel is

A.Maximum

B.Minimum

C.Zero

D.Half of normal flow

222. Tube is an opening

A.With closed perimeter and of regular form through which water flows

B.With prolonged sides having length of 2-3 diameters of opening in thick wall

C.With partially full flow

D.In hydraulic structure with regulation pi ?vision

223. Highest efficiency is obtained with following channel section

A.Circular

B.Trapezoidal.

C.Rectangular

D.Quadrant

224. A triangular section in open cnannel flow will be most eeonornical when the vertex angle at the triangle base point is

A.30?

B.45?

C.60?

D.90?

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