# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 4

31.

The velocity at which the flow changes from laminar flow to turbulent flow is called

 A. critical velocity B. velocity of approach C. sub-sonic velocity D. super-sonic velocity

Answer: Option A

Explanation:

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32.

The discharge through a channel of trapezoidal section is maximum when

 A. width of channel at the top is equal to twice the width at the bottom B. depth of channel is equal to the width at the bottom C. the sloping side is equal to half the width at the top D. the sloping side is equal to the width at the bottom

Answer: Option C

Explanation:

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33.

The vacuum pressure is always the negative gauge pressure.

 A. Yes B. No

Answer: Option A

Explanation:

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34.

The value of coefficient of discharge is __________ the value of coefficient of velocity.

 A. less than B. same as C. more than

Answer: Option A

Explanation:

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35.

When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

 A. narrow-crested weir B. broad-crested weir C. Ogee weir D. submerged weir

Answer: Option D

Explanation:

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