# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 8

6.

The highest efficiency is obtained with a channel of __________ section.

 A. circular B. square C. rectangular D. trapezoidal

Explanation:

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7.

A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is

 A. 4.5 kN/m3 B. 6 kN/m3 C. 7.5 kN/m3 D. 10 kN/m3

Explanation:

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8.

Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

 A. Cc x Cv B. Cc x Cr C. Cv x Cr D. Cc/Cr

Explanation:

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9.

In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

 A. running full B. running free C. partially running full D. partially running free

Explanation:

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10.

The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

 A. decreases B. increases