81.
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, $$\alpha $$ = Angle of contact of the liquid surface and $$\sigma $$ = Surface tension)

84.
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

85.
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if

87.
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

89.
The flow ratio of Francis turbine is defined as the ratio of the

90.
The jet ratio is defined as the ratio of the

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