Fluid Mechanics MCQ Questions & Answers

51

For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

A) R B) R² C) R⁴ D) R^0.5

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Answer & Solution

Answer: Option C

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52

When a fluid flows over a solid surface, the

A) Velocity is uniform at any cross-section B) Velocity gradient is zero at the solid surface C) Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves D) Velocity is not zero at the solid surface

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Answer & Solution

Answer: Option B

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53

Which of the following can be used for the direct measurement of volumetric flow rate of slurry?

A) Venturimeter B) Orificemeter C) Rotameter D) Pitot tube

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Answer & Solution

Answer: Option C

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54

In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is

A) The velocity of sound B) Dependent on its cross-sectional area C) Dependent on fluid viscosity D) Dependent on fluid density

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Answer & Solution

Answer: Option A

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55

Minimum porosity for fluidisation is

A) That corresponding to static bed B) That corresponding to completely fluidised bed C) The porosity of the bed when true fluidisation begins D) Less than that of the static bed

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Answer & Solution

Answer: Option C

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56

For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is

A) 0.5 B) 1 C) 0.66 D) < 0.5

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Answer & Solution

Answer: Option B

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57

Efficiency of power transmission (η) through a circular pipe is given by $$\frac{{{{\text{h}}_{\text{t}}} - {{\text{h}}_{\text{f}}}}}{{{{\text{h}}_{\text{t}}}}},$$ which has a maximum value of __________ percent.

A) 33.3 B) 50 C) 66.6 D) 88.8

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Answer & Solution

Answer: Option C

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58

A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Head = 8 metres
Flow = 1000 litres/minutes.
If its speed is halved, the power consumed now will be __________ hp.

A) 0.5 B) 2 C) 4 D) 1

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Answer & Solution

Answer: Option A

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59

Pick out the wrong statement pertaining to fluid flow.

A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5 B) The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe C) Navier-Stokes equation is applicable to the analysis of viscous flows D) Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids

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Answer & Solution

Answer: Option A

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60

The discharge co-efficient for an orificemeter does not depend upon the

A) Pipe length B) Ratio of pipe diameter to orifice diameter C) Type of orifice & the Reynolds number D) Pipe diameter

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Answer & Solution

Answer: Option A

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering