The main factor on which the behaviour of a mass of fluidised solid depends mainly is the

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

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

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

A

Minimum fluidisation velocity

B

Terminal velocity

C

Elutriation velocity

D

Superficial velocity

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

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 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

Octane number of gasoline produced by two stage fluidised catalytic cracking process is

A

80

B

87

C

92

D

97

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

Slugging occurs in a fluidised bed, if the bed is

A

Narrow

B

Deep

C

Both A & B

D

Neither A nor B

Slugging in a fluidised bed can be avoided by using

A

Tall narrow vessel

B

Deep bed of solids

C

Shallow beds of solids and proper choice of particle size

D

Very large particles

The main factor on which the behaviour of a mass of fluidised solid depends mainly is the

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