For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of

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

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

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

The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to

A

m

B

$$\frac{1}{{\text{m}}}$$

C

$$\sqrt {\text{m}} $$

D

m²

In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.

A

Semi-batch

B

Tubular

C

Batch

D

Back-mix

A circular flower bed has diameter 4m. The flower bed is increased so that the diameter is now 12m. How many times larger is the new flower bed?

A

9

B

3

C

32

D

8

Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

A

Is more accurate in finding the number of equilibrium stages

B

Accounts for the enthalpy changes in the process

C

Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method

D

All of the above

A machine part is packed in a box of size 5cm x 4cm x 2cm. The number of parts that can be packed in a carton of size 25cm x 16cm x 8cm is-

A

60

B

80

C

40

D

160

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 reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

A

Low pressure drop and high hold up

B

High pressure drop and low hold up

C

Low pressure drop and low hold up

D

High pressure drop and high hold up

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of

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