# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 3

41.

The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

 A. Q = Cd x a x 2gh B. C. D.

Explanation:

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42.

The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

 A. equal to B. less than C. more than

Explanation:

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43.

The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size.

 A. Agree B. Disagree

Explanation:

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44.

An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

 A. equal to B. directly proportional C. inversely proportional

Explanation:

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45.

Euler's number is the ratio of __________ force to pressure force.

 A. inertia B. gravity C. viscous