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)
82. The viscosity of water is __________ than that of mercury.
83. The surface tension of mercury at normal temperature compared to that of water is
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
86. In a centrifugal pump casing, the flow of water leaving the impeller, is
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
88. Operation of McLeod gauge used for low pressure measurement is based on the principle of
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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