Fluid Mechanics MCQs with answers Page - 4

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Q. Ratio of inertial forces to surface tension forces is called the __________ number.

  • (A) Weber
  • (B) Mach
  • (C) Froude
  • (D) Euler

A

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Q. The ratio of inertial forces to viscous forces is called the __________ number.

  • (A) Weber
  • (B) Mach
  • (C) Froude
  • (D) Reynold

A

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Q. Cavitation in a centrifugal pump can be avoided by keeping the

  • (A) Inlet pressure high
  • (B) Outlet pressure high
  • (C) Outlet pressure low
  • (D) Inlet pressure low

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Q. Cavitation in a centrifugal pump results from

  • (A) High discharge pressure
  • (B) Low barometric pressure
  • (C) High discharge velocity
  • (D) High discharge rate

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Q. Which of the following produces maximum pressure difference for transportation of gases?

  • (A) Compressors
  • (B) Fansrs
  • (C) Blowe
  • (D) Vaccum pumps

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Q. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D. of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062.

  • (A) 10 m
  • (B) 11 m
  • (C) 12 m
  • (D) 20 m

A

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Q. The nominal size of a hose pipe is specified by its

  • (A) I.D.
  • (B) O.D.
  • (C) Thickness
  • (D) None of these

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Q. Rise of liquid in a capillary tube is due to

  • (A) Adhesion
  • (B) Cohesion
  • (C) Both A & B
  • (D) Neither A nor B

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Q. The normal stress is the same in all directions at a point in a fluid, when the fluid is

  • (A) Non-viscous
  • (B) Incompressible
  • (C) Both A and B
  • (D) Having no motion of one fluid layer relative to the other

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Q. Reciprocating pumps compared to centrifugal pumps

  • (A) Deliver liquid at uniform pressure
  • (B) Can handle slurries more efficiently
  • (C) Are not subject to air binding
  • (D) Can be operated with delivery valve closed

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