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Hydraulics and Fluid Mechanics problems

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

  • Options
  • A. less than unity
  • B. unity
  • C. between 1 and 6
  • D. more than 6
    • Discuss
  • 2. The loss of head at exit of a pipe is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 3. 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
    • Discuss
  • 4. 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
    • Discuss
  • 5. A flow through an expanding tube at increasing rate is called unsteady non-uniform flow.

  • Options
  • A. Yes
  • B. No
    • Discuss
  • 6. The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 7. 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
    • Discuss
  • 8. The discharge through a small rectangular orifice is given by (where Cd = 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 = Cd x a x 2gh
  • B.
  • C.
  • D.
    • Discuss
  • 9. 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
    • Discuss
  • 10. 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
    • Discuss

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