Fluid Mechanics MCQ Questions & Answers

61

In the laminar boundary layer flow over a flat plate, the ratio $$\frac{\delta }{{\text{x}}}$$ varies as: (where, $$\delta $$ is the boundary layer thickness and x is the distance from the leading edge in the direction of flow).

A) Re B) $$\sqrt {{\text{Re}}} $$ C) $$\frac{1}{{{\text{Re}}}}$$ D) $${\text{R}}{{\text{e}}^{ - \frac{1}{2}}}$$

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Answer & Solution

Answer: Option D

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62

Hydraulic radius is the ratio of

A) Wetted perimeter to flow area B) Flow area to wetted perimeter C) Flow area to square of wetted perimeter D) Square root of flow area to wetted perimeter

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Answer & Solution

Answer: Option B

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63

Prandtl number is a measure of the

A) Heat conduction to viscosity of a fluid B) $$\frac{{{{\text{C}}_{\text{p}}}}}{{{{\text{C}}_{\text{v}}}}}$$ of a fluid C) Elastic force to pressure force in the fluid flow D) Inertial force to elastic force in the fluid flow

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Answer & Solution

Answer: Option A

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64

Mass velocity is independent of temperature & pressure, when the flow is

A) Unsteady through unchanged cross-section B) Steady through changing cross-section C) Steady and the cross-section is unchanged D) Unsteady and the cross-section is changed

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Answer & Solution

Answer: Option C

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65

What causes convective acceleration in fluid flow?

A) Steep slope in flow B) Unsteady nature of flow C) Non-uniformity of flow D) Turbulence in flow

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Answer & Solution

Answer: Option C

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66

Normal depth in open channel flow is the depth of flow in the channel

A) Corresponding to uniform flow B) Measured normal to the channel bed C) Corresponding to steady flow D) None of these

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Answer & Solution

Answer: Option A

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67

Which of the following is not concerned with the fluid-particle interaction?

A) Drag co-efficient B) Froude number C) Galileo number D) Weber number

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Answer & Solution

Answer: Option D

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68

Which of the following is dimensionless?

A) Angular velocity B) Fanning friction factor C) Specific volume D) None of these

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Answer & Solution

Answer: Option B

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69

The pressure co-efficient is the ratio of pressure forces to __________ forces.

A) Viscous B) Inertial C) Gravity D) Surface tension

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Answer & Solution

Answer: Option B

Solution:

The pressure coefficient is the ratio of pressure forces to inertial forces. In fluid mechanics, the pressure coefficient is a dimensionless quantity that relates the pressure at a certain point to the free stream dynamic pressure. Inertial forces are associated with the motion and acceleration of fluid particles. Therefore, in this context, the correct option is Option B: Inertial.

70

Pressure co-efficient is the ratio of pressure forces to __________ forces.

A) Gravity B) Inertial C) Viscous D) None of these

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Answer & Solution

Answer: Option B

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering