# Mechanical Engineering - Hydraulics and Fluid Mechanics

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

36.

When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

 A. 1.84(L - 0.1nH)H3/2 B. 1.84(L - nH)H2 C. 1.84(L - 0.1nH)H5/2 D. 1.84(L - nH)H3

Answer: Option A

Explanation:

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37.

The total energy line lies over the centre line of the pipe by an amount equal to

 A. pressure head B. velocity head C. pressure head + velocity head D. pressure head - velocity head

Answer: Option C

Explanation:

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38.

A piezometer tube is used only for measuring

 A. low pressure B. high pressure C. moderate pressure D. vacuum pressure

Answer: Option C

Explanation:

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39.

The flow in a pipe is turbulent when Reynold number is

 A. less than 2000 B. between 2000 and 2800 C. more than 2800 D. none of these

Answer: Option C

Explanation:

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40.

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

 A. remains horizontal B. becomes curved C. falls on the front end D. falls on the back end

Answer: Option C

Explanation:

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