Fluid Mechanics MCQs

Chemical Engineering Objective Questions

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155. The fluid property which matters for falling rain drops to acquire spherical shape is its

B. Height of descend

D. Surface tension

156. Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.

A. Reciprocating

C. Electromagnetic

157. Which of the following quantities are computed by using the hydraulic radius for non-circular ducts?

A. Velocity and relative roughness

B. Head loss and velocity

C. Reynold number, relative roughness and head loss

D. Reynolds number and friction factor

158. The most serious disadvantage of an orificemeter is that

A. It is not very accurate

B. It is very costly

C. Most of the pressure drop is not recoverable

D. It is not suitable for measuring gas flow

159. For a reciprocating pump, the indicator diagram is the graph between the

A. Discharge and overall efficiency

B. Volume swept by piston for one complete revolution and the pressure in the cylinder

C. Angle swept by the crank pin at any instant and the discharge

D. None of these

160. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have

A. Very low speeds

B. Smaller discharge

C. Higher capital & maintenance cost

D. High vibrations

161. Propeller type centrifugal pumps are most suitable for

A. High capacity at high heads

B. High capacity at low heads

C. Low capacity at high heads

D. Low capacity at low heads

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