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

Kelly and Chris packed several boxes with books. If Chris packed 60 percent of the total number of boxes, what was the ratio of the number of boxes Kelly packed to the number of boxes Chris packed?

A

1 to 6

B

1 to 4

C

2 to 5

D

2 to 3

For flow of fluids through packed bed, the superficial velocity is

A

Less than the average velocity through channels

B

More than the average velocity through channels

C

Dependent on the pressure drop across the bed

D

Same as the average velocity through channels

The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is

A

0.3

B

0.9

C

0.03

D

0.66

Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as

A

Δp = G

B

Δp = G^0.5

C

Δp = G²

D

Δp = $$\frac{1}{{{{\text{G}}^{0.6}}}}$$

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

A

Is greater than

B

Is lower than

C

Is same as

D

Cannot be predicted as data are insufficient

The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is

A

0.1

B

0.55

C

0.95

D

1.85

With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop

A

Decreases

B

Remains unchanged

C

Increases

D

Decreases exponentially

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

A

Parabolic

B

Hyperbolic

C

Straight line

D

None of these

Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.

A

Less than

B

More than

C

Same as

D

None of these

Fluid flow through a packed bed is represented by the __________ equation.

A

Fanning's

B

Ergun's

C

Hagen-Poiseuille's

D

None of these

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

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