Fluid Mechanics questions with solutions

Showing 1–10 of 269 questions

• NumericmediumFluid Mechanics

  Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at top of both dams. The second dam is twice as high and twice as wide as the first dam. The force of the water on the second dam is how much greater than the force on the first? (Ignore atmospheric pressure since it is pushing on both sides of the dams.)

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• MCQeasyFluid Mechanicspascal law and buoyant force

  The small and large pistons of an ideal hydraulic machine have areas 10 cm² and 250 cm², respectively. If the small piston is pushed downward through 50 cm, through what distance does the large piston rise?

  Options

  • Option A

    1 cm

  • Option B

    2 cm

  • Option C

    5 cm

  • Option D

    20 cm

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• MCQmediumFluid Mechanicsequation of continuity and bornullie theorem

  A liquid of density 1000 kg m⁻³ flows steadily through a horizontal tube. Area at A is 1.5 cm², area at B is 25 mm², and speed at B is 60 cm s⁻¹. The pressure difference Pₐ - Pʙ is:

  

  Options

  • Option A

    175 Pa

  • Option B

    36 Pa

  • Option C

    27 Pa

  • Option D

    135 Pa

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• NumericmediumFluid Mechanicsequation of continuity and bornullie theorem

  A uniform-cross-section siphon carries water from a large open reservoir to an outlet 5 m below the reservoir surface. Its highest point is 2 m above the reservoir surface. Take atmospheric pressure as 100 kPa, ρ = 1000 kg/m³ and g = 10 m/s². Neglect losses. If the absolute pressure at the highest point is N kPa, find N.

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• MCQmediumFluid Mechanics

  A light cylindrical vessel is kept on a horizontal surface. Area of base is A. A hole of cross-sectional area 'a' is made just at its bottom side. The minimum coefficient of friction necessary to prevent sliding the vessel due to the impact force of the emerging liquid is (a ≪ A) :

  Options

  • Option A

    A/(2a)

  • Option B

    None of these

  • Option C

    2a/A

  • Option D

    a/A

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• IntegermediumFluid Mechanicsequation of continuity and bornullie theorem

  Glycerine of density 1.25 × 10³ kg m⁻³ flows through a conical pipe. End areas are 10 cm² and 5 cm², and pressure drop is 3 N m⁻². The volume-flow rate is x × 10⁻⁵ m³ s⁻¹. Find x.

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• MCQmediumFluid Mechanicsquestion based on variation of pressure

  A U-tube of uniform cross-section contains a liquid and is accelerated horizontally with acceleration a. The horizontal separation between the two vertical arms is l. The difference in liquid levels is:

  Options

  • Option A

    al/g

  • Option B

    gl/a

  • Option C

    a²l/g²

  • Option D

    l√(g²+a²)/g

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• NumericmediumFluid Mechanicsequation of continuity and bornullie theorem

  A storm produces an air speed of 40 m/s just above a horizontal roof of area 100 m², while air immediately below the roof is approximately stationary. Take air density 1.2 kg/m³. If the upward force predicted by the simplified Bernoulli model is N kN, find N.

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• Multi-correctmediumFluid Mechanicsequation of continuity and bornullie theorem

  For a horizontal Venturimeter carrying an ideal incompressible liquid, which statements are correct?

  Select all that apply

  • Option A

    The fluid speed is greater at the throat than at the wider inlet.

  • Option B

    The static pressure is lower at the throat.

  • Option C

    The measured pressure difference can be used to determine the volume-flow rate.

  • Option D

    The working principle combines the equation of continuity with Bernoulli's theorem.

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• NumericmediumFluid Mechanics

  A gas is connected to an open-end manometer containing a liquid of relative density 0.85. The atmospheric pressure is 96 kPa and the level difference is 55 cm as shown. Find the gas pressure. Image

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