Minimum fluidisation velocity for a specific system depends upon the

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

Minimum porosity for fluidisation is

A

That corresponding to static bed

B

That corresponding to completely fluidised bed

C

The porosity of the bed when true fluidisation begins

D

Less than that of the static bed

Which of the following is not an advantage of fluidisation from transfer operation point of view?

A

Intimate contact of the fluid with all parts of the solid particles

B

Lower fluid pumping power requirement

C

Minimisation of temperature variation

D

Prevention of particle seggregation

When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.

A

Spouted

B

Sluggish

C

Boiling

D

Teeter

In continuous fluidisation

A

Solids are completely entrained

B

The pressure drop is less than that for batch fluidisation

C

There is no entrainment of solids

D

Velocity of the fluid is very small

The specific cutting energy used for establishing the machinability of the metal depends upon its

A

coefficient of friction

B

micro-structure

C

work hardening characteristics

D

all of the mentioned

Specific heat of an ideal gas depends upon its

A

Molecular weight

B

Pressure

C

Temperature

D

Volume

Specific speed of a centrifugal pump depends upon the __________ head.

A

Suction

B

Delivery

C

Manometric

D

None of these

The specific speed of a hydraulic turbine depends upon

A

Speed and power developed

B

Discharge and power developed

C

Speed and head of water

D

Speed, power developed and head of water

Velocity of a reaction depends upon the

A

Nature of the reactants

B

Concentration of the reactants

C

Temperature at which the reaction is carried

D

All of the above

Minimum fluidisation velocity for a specific system depends upon the

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