# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 2

36.

The velocity at which the laminar flow stops, is known as

 A. velocity of approach B. lower critical velocity C. higher critical velocity D. none of these

Explanation:

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37.

When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

 A. steady flow B. turbulent flow C. vortex flow D. uniform flow

Explanation:

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38.

The Newton's law of resistance is based on the assumption that the

 A. planes of the body are completely smooth B. space around the body is completely filled with the fluid C. fluid particles do not exert any influence on one another D. all of the above

Explanation:

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39.

The Euler's equation for the motion of liquids is based upon the assumption that

 A. the fluid is non - viscous, homogeneous and incompressible B. the velocity of flow is uniform over the section C. the flow is continuous, steady and along the stream line D. all of the above

Explanation:

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40.

A weir is usually made of masonry or concrete.

 A. Yes B. No