Fluid Mechanics Sheet 8
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1) Question.
An impulse turbine -
Answer. -
2) Question.
The causes of cavitation are -
Answer.Cavitation in pumps occurs when pressure at the suction side falls below the vapor pressure of the liquid, causing formation and collapse of vapor bubbles.
Main causes:
1. High suction lift → increases negative pressure at pump inlet.
2. High pump speed → increases velocity and reduces pressure further.
Both factors together promote cavitation, leading to noise, vibration, and damage to pump impellers. -
3) Question.
The dimensions of surface tension are -
Answer.Surface Tension (T) = Force × Length-1 . . . . . (1)
Since, Force = Mass × Acceleration
And, acceleration = velocity × time-1 = [L T-2]
∴ The dimensional formula of force = M1 L1 T-2 . . . . (2)
On substituting equation (2) in equation (1) we get,
Surface Tension (T) = Force × Length-1
Or, T = [M1 L1 T-2] × [L-1] = M1 T-2.
Therefore, surface tension is dimensionally represented as M1 T-2.
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4) Question.
pressure of 200 kPa is equivalent to a head of x metres of carbon tetra-chloride of relative density 1.59 where x is equal to
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5) Question.
If a liquid has greater cohesion than adhesion with the solid, then the liquid in the capillary tube will
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6) Question.
surface tension of water
Answer. -
7) Question.
The intensity of pressure developed by surface tension of 0.075 N/m in a droplet of water of 0.075 mm diameter is
Answer. -
8) Question.
Newton's law of viscosity relates
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9) Question.
The viscosity of a gas
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10) Question.
Froude number is the ratio of inertia force to -
Answer. -
11) Question.
Which of the following is not a non-dimensional parameter ?
Answer.