61. In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.
62. In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
63. Which of the following has the maximum compression ratio?
64. Stoke's law is valid, when the particle Reynolds number is
65. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the
66. Foot valve provided in the pump is a __________ valve.
67. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is
68. For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by
69. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
70. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)
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