Chemical Engineering - Fluid Mechanics

46. 

For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is

A. more
B. less
C. equal
D. independent of porosity

Answer: Option B

Explanation:

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47. 

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.

Answer: Option B

Explanation:

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48. 

The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

A. barometric pressure
B. speed of the impeller
C. diameter of the impeller
D. both (b) and (c)

Answer: Option A

Explanation:

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49. 

High specific speed of a pump implies that, it is a/an __________ pump.

A. centrifugal
B. mixed flow
C. axial flow
D. none of these

Answer: Option C

Explanation:

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50. 

A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be

A. 8400 Pa/m
B. 12600 Pa/m
C. 18900 Pa/m
D. 16800 Pa/m

Answer: Option B

Explanation:

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