Q. What is the value of Fanning friction factor f ' for smooth pipe at NRe = 106 approximately?
✅ Correct Answer: (A)
0.003
Fluid Mechanics MCQs | Page - 4
Dear candidates you will find MCQ questions of Fluid Mechanics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. Ratio of inertial forces to surface tension forces is called the __________ number.
✅ Correct Answer: (A)
Weber
Q. The ratio of inertial forces to viscous forces is called the __________ number.
✅ Correct Answer: (D)
Reynold
Q. Cavitation in a centrifugal pump can be avoided by keeping the
✅ Correct Answer: (A)
Inlet pressure high
Q. Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
✅ Correct Answer: (B)
II, III, V
Q. Cavitation in a centrifugal pump results from
✅ Correct Answer: (B)
Low barometric pressure
Q. Which of the following produces maximum pressure difference for transportation of gases?
✅ Correct Answer: (A)
Compressors
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.
✅ Correct Answer: (B)
11 m
Q. The nominal size of a hose pipe is specified by its
✅ Correct Answer: (A)
I.D.
Q. Rise of liquid in a capillary tube is due to
✅ Correct Answer: (C)
Both A & B
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