225. The motion of a fluid is vortex if each particle of the fluid moves in a circular path with the speed which
A.Is constant
B.Is directly proportional to distance from centre
C.Varies as square of distance from centre
D.Varies inversely as the distance from centre
226. The laminar sub-layer acts as
A.An insulating medium
B.Good conductor of heat
C.Refractory substance
D.Heat absorber
227. A mouth-piece can't be used for emptying tanks with large heads because
A.Cavitation occurs at vena contracta
B.Vortex is created at vena contracta
C.Variation in discharge is high
D.Flow-through mouth piece is erratic
228. Gate 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 provision
229. The value of Coefficient of velocity for a sharp edged orifice is of the order of
A.0.45
B.0.98.
C.0.62
D.0.78
230. The value of coefficient of velocity depends upon
A.Slope of orifice
B.Friction at the orifice surface.
C.Head of liquid above orifice
D.Type of orifice
231. The contraction of area for flow through orifice in tank depends on
A.Shape of orifice
B.Size of orifice
C.Head in tank
D.All of the above
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