Fluid Mechanics MCQs with answers Page - 14

Here, you will find a collection of MCQ questions on Fluid Mechanics. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Admin • 833.24K Points
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Q. A centrifugal pump loses prime after starting. The reason of this trouble may be

  • (A) Incomplete priming
  • (B) Too high a suction lift
  • (C) Low available NPSH and air leaks in the suction pipe
  • (D) All of the above

A

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Q. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

  • (A) Directly as square of gas density
  • (B) Directly as gas density
  • (C) Directly as square root of gas density
  • (D) Inversely as gas density

A

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Q. The range of a particular rotameter can be increased by

  • (A) Use of floats of different densities
  • (B) No means
  • (C) Increasing the diameter of the float
  • (D) Decreasing the diameter of the float

A

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Q. Two liquids manometer is used for measuring small pressure differences in

  • (A) Liquids
  • (B) Gases
  • (C) Mixture of hydrocarbons
  • (D) None of these

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Q. Pick out the wrong statement about a streamline.

  • (A) It is always parallel to the main direction of the fluid flow
  • (B) It is a line across which there is no flow and it is equivalent to a rigid boundary
  • (C) Streamlines intersect at isolated point of zero velocity and infintie velocity
  • (D) The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity

A

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Q. Dimension of surface tension is (where, F = force, L = length)

  • (A) F.L-1
  • (B) F-1.L
  • (C) F.L-2
  • (D) F-2.L

A

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Q. In fluid flow, cavitation is caused, if the

  • (A) Fluid velocity decreases to zero
  • (B) Total energy decreases
  • (C) Both A and B
  • (D) Flow pressure approaches its vapor pressure at the prevailing temperature

A

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Q. When the momentum of one fluid is used for moving another fluid, such a device is called a/an

  • (A) Jet pump
  • (B) Blower
  • (C) Acid egg
  • (D) None of these

A

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Q. When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.

  • (A) Spouted
  • (B) Sluggish
  • (C) Boiling
  • (D) Teeter

A

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Q. Co-efficient of velocity is __________ the coefficient of discharge.

  • (A) Less than
  • (B) More than
  • (C) Equal to
  • (D) Not related to

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