The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the

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

Slugging occurs in a fluidised bed, if the bed is

A

Narrow

B

Deep

C

Both A & B

D

Neither A nor B

The uniformity of a gas fluidised bed depends upon the __________ of the solid particles.

A

Size

B

Surface properties

C

Both A and B

D

Neither A nor B

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

With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity

A

Widens

B

Squeezes

C

Does not change

D

Unpredictable from the data

If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

A

Vi = Vo

B

Vt > Vo

C

U

D

V = Uo

Which of the following is used as a catalyst in fluidised bed catalytic cracking?

A

Silica-magnesia

B

Silica-alumina

C

Bentonite clays

D

All of the above

Which of the following is not applicable to fluidised bed combustion of coal?

A

It can not burn low grade coal

B

It achieves higher fuel combustion efficiency

C

Less heat transfer surface area is required in boilers

D

None of these

For a fluidised bed reactor, the most suitable/relevant model is a __________ model.

A

Tank in series

B

Bubbling bed

C

Plug flow

D

None of these

Fluidised bed reactor is characterised by

A

Uniformity of temperature

B

Comparatively smaller equipment

C

Very small pressure drop

D

Absence of continuous catalyst regeneration facility

The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the

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