# Mechanical Engineering - Hydraulics and Fluid Mechanics

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

6.

The force of buoyancy is always __________ the weight of the liquid displaced by the body.

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

Answer: Option A

Explanation:

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7.

The coefficient of discharge is the ratio of theoretical discharge to the actual discharge through an orifice.

 A. True B. False

Answer: Option B

Explanation:

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8.

The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s).

 A. True B. False

Answer: Option A

Explanation:

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9.

The purpose of a surge tank is

 A. to control the pressure variations due to rapid changes in the pipe line flow B. to eliminate water hammer possibilities C. to regulate flow of water to turbines by providing necessary retarding head of water D. all of the above

Answer: Option D

Explanation:

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10.

A fluid which obeys the Newton's law of viscosity is termed as

 A. real fluid B. ideal fluid C. newtonian fluid D. non-newtonian fluid

Answer: Option C

Explanation:

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