In a short cylindrical external mouthpiece, the vena contracta occurs at a dista

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Question
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
Options
A. equal to
B. one-fourth
C. one-third
D. one-half

Correct Answer

one-fourth

Hydraulics and Fluid Mechanics problems

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3. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
Options
A. half the depth
B. half the breadth
C. twice the depth
D. twice the breadth

4. Which of the following statement is correct?
Options
A. In a compressible flow, the volume of the flowing liquid changes during the flow.
B. A flow in which the volume of the flowing liquid does not change, is called incompressible flow.
C. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.
D. all of the above

6. The discharge through a small rectangular orifice is given by (where C_d = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)
Options
A. Q = C_d x a x 2gh
B.
C.
D.

7. An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
Options
A. equal to
B. directly proportional
C. inversely proportional

8. 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
Options
A. Newton's law of motion
B. Newton's law of cooling
C. Newton's law of viscosity
D. Newton's law of resistance

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