Mechanical Engineering - Hydraulics and Fluid Mechanics

26. 

A flow is called sub-sonic, if the Mach number is

A. less than unity
B. unity
C. between 1 and 6
D. more than 6

Answer: Option A

Explanation:

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27. 

The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

A. less than
B. more than

Answer: Option B

Explanation:

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28. 

Re-entrant or Borda's mouthpiece is an __________ mouthpiece.

A. internal
B. external

Answer: Option A

Explanation:

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29. 

The flow in a pipe is neither laminar nor turbulent when Reynold number is

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

Answer: Option B

Explanation:

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30. 

The intensity of pressure on an immersed surface __________ with the increase in depth.

A. does not change
B. increases
C. decreases

Answer: Option B

Explanation:

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