Related Questions

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
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
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
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 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
In a fluidised bed reactor
A Temperature gradients are very high
B Temperature is more or less uniform
C Hot spots are formed
D Segregation of the solids occurs
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
Advantages of fluidised bed combustion are
A Reduced NOx formation in flue gas
B Lower furnace operating temperature
C High heat transfer rate
D All of the above

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