Exercise: Hydraulics And Fluid Mechanics

Questions for: Hydraulics And Fluid Mechanics

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: A
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The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
A:
1/2 depth
B:
1/2 breadth
C:
1/2 sloping side
D:
1/4 (depth + breadth)
Answer: A
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The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
A:
Newton's law of motion
B:
Newton's law of cooling
C:
Newton's law of viscosity
D:
Newton's law of resistance
Answer: D
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If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.
A:
neutral
B:
stable
C:
unstable
D:
Answer: A
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The specific weight of sea water is __________ that of pure water.
A:
same as
B:
less than
C:
more than
D:
Answer: C
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