# Chemical Engineering - Fluid Mechanics

16.

Purpose of relief valve in a reciprocating pump is to

 A. protect the pump against developing excessive pressure. B. facilitate unidirectional flow of liquid. C. reduce the discharge pressure. D. control the rate of discharge.

Explanation:

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17.

Select the correct statement.

 A. The discharge through a venturimeter depends upon Δp only and is independent of orientation of the meter. B. A venturimeter with a given gage difference discharges at a greater rate, when the flow is vertically downward through it, than when the flow is vertically upward. C. For a given pressure difference, the discharge of gas is greater through a venturimeter, when compressibility is taken into account, than when it is neglected. D. The overall pressure loss is the same in a given pipe line, whether a venturimeter or a nozzle with the same throat dia is used.

Explanation:

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18.

The Kozney-Carman equation, rewritten in terms of non-dimensional numbers gives (ΔP/pu2 ) proportional to

 A. B. C. D.

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19.

In case of turbulent flow of fluid through a circular pipe, the

 A. mean flow velocity is about 0.5 times the maximum velocity. B. velocity profile becomes flatter and flatter with increasing Reynolds number. C. point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius). D. skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more.

Explanation:

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20.

For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is

 A. more B. less C. equal D. either (a) or (b); depends on the viscosity of the fluid