Chemical Engineering - Fluid Mechanics

1. 

Pick out the wrong statement.

A. The form drag is dependent upon the occurrence of a wake.
B. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance.
C. An ideal fluid is the one, which has negligible surface tension and obeys the Newton's law of viscosity.
D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

Answer: Option C

Explanation:

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2. 

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.

Answer: Option C

Explanation:

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3. 

Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

A. U-tube water.
B. U-tube mercury.
C. inclined tube mercury.
D. inclined tube water.

Answer: Option D

Explanation:

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4. 

For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).

A. 1/D
B. 1/D2
C. 1/D5
D. D2

Answer: Option C

Explanation:

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5. 

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).

A. increase
B. decrease
C. remain constant
D. either (a) or (b); depends on other factors

Answer: Option A

Explanation:

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