11. Pascal's law is valid, only when the fluid is
12. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will
13. Two piping system are said to be equivalent, when the __________ are same.
14. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and
15. In fluid flow, the stagnation point is defined as a point, where the __________ is zero.
16. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity
17. A rectangular surface 3' x 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water)
18. Dimension of surface tension is (where, F = force, L = length)
19. In fluid flow, cavitation is caused, if the
20. When the momentum of one fluid is used for moving another fluid, such a device is called a/an
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