## 11. Pascal's law is valid, only when the fluid is

## 12. Friction factor for a hydraulically smooth pipe at N_{Re} = 2100 is f_{1}. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N_{Re}, will

_{Re}= 2100 is f

_{1}. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N

_{Re}, 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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