# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 7

21.

The total pressure on the top of a closed cylindrical vessel competely filled up with a liquid is

 A. directly proportional to (radius)2 B. inversely proportional to (radius)2 C. directly proportional to (radius)4 D. inversely proportional to (radius)4

Answer: Option C

Explanation:

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22.

Poise is the unit of viscosity in C.G.S. system of units.

 A. Agree B. Disagree

Answer: Option A

Explanation:

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23.

The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

 A. 0.34 times B. 0.67 times C. 0.81 times D. 0.95 times

Answer: Option D

Explanation:

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24.

When the Mach number is more than 6, the flow is called

 A. sub-sonic flow B. sonic flow C. super-sonic flow D. hyper-sonic flow

Answer: Option D

Explanation:

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25.

The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

 A. equal to B. one-half C. three fourth D. double

Answer: Option D

Explanation:

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