Fluid Mechanics MCQ Questions & Answers

41

Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.

A) 2 to 3 B) 0.01 to 0.10 C) 200 to 300 D) 100 to 1000

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Answer & Solution

Answer: Option A

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42

Small pressure differences in liquids is measured using a/an

A) U-tube manometer B) Inclined tube manometer C) Pitot tube D) None of these

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Answer & Solution

Answer: Option B

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43

Bernoulli's equation accounts for the

A) Various momentums B) Various masses C) Different forms of mechanical energy D) None of these

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Answer & Solution

Answer: Option C

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44

For steady ideal fluid flow, the Bernoulli's equation states that the

A) Velocity is constant along a stream line B) Energy is constant throughout the fluid C) Energy is constant along a stream line, but may vary across stream lines D) None of these

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Answer & Solution

Answer: Option C

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45

Which of the following is not dimension-less?

A) Froude number B) Kinematic viscosity C) Pressure co-efficient D) None of these

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Answer & Solution

Answer: Option B

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46

Turbulent flow generally occurs for cases involving

A) Highly viscous fluid B) Very narrow passages C) Very slow motion D) None of these

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Answer: Option D

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47

Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

A) At the centre B) At $$\frac{{\text{d}}}{4}$$ from the wall C) At the wall D) At $$\frac{{\text{d}}}{8}$$ from the wall

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Answer & Solution

Answer: Option C

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48

The ratio of maximum to average velocity in case of streamline flow between parallel plates is

A) 1 B) 1.5 C) 2 D) 2.5

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Answer & Solution

Answer: Option B

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49

Pick out the wrong statement.

A) The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonion fluids is $$\frac{{\text{D}}}{{4{\text{L}}}} \cdot \Delta {\text{p}}$$ B) In the equation, $$\tau \cdot {{\text{g}}_{\text{c}}} = {\text{k}} \cdot {\left( {\frac{{{\text{du}}}}{{{\text{dy}}}}} \right)^{\text{n}}}$$ the value of the value of 'n' for pseudoplastic and dilatant fluids are < 1 and > 1 respectively. C) Shear stress for Newtonion fluid is proportional to the rate of shear in the direction perpendicular to motion D) With increase in the Mach number > 0.6, the drag co-efficient decreases in case of compressible fluids

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Answer & Solution

Answer: Option D

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50

The pressure head of a flow meter remains constant for

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

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Answer & Solution

Answer: Option C

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering