In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

Which of the following is not accomplished by agitation of liquids in agitators?

A

Dispersing gas in liquid

B

Blending of immiscible liquids

C

Dispersing immiscible liquid in form of emulsion

D

Suspending solid particles

Use of baffles in agitators help in minimising the __________ tendency.

A

Swirling

B

Vortexing

C

Both A & B

D

Neither A nor B

For turbine agitator, the impeller diameter is about

A

0.3 to 0.5 d

B

0.1 to 0.2 d

C

0.65 to 0.85 d

D

0.95 d

Scale up of agitator design requires

A

Geometrical similarity only

B

Dynamic similarity only

C

Both geometrical and dynamic similarity

D

All of the above

A propeller agitator

A

Produces mainly axial flow

B

Is used for mixing high viscosity pastes

C

Runs at very slow speed (2 rpm)

D

All of the above

Agitator is provided in a crystalliser for

A

Avoiding deposition on cooler surfaces

B

Formation of nuclei

C

Crystal growth

D

All of the above

Helical screw agitator is used for

A

Mixing highly viscous pastes

B

Blending immiscible liquids

C

Mixing liquids at very high temperature (> 250 °C)

D

None of these

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

A

>10

B

>100

Paddle agitator

A

Is suitable for mixing low viscosity liquids

B

Produces axial flow

C

Moves at very high speed

D

None of these

Speed of industrial paddle agitator ranges from __________ rpm.

A

1 to 5

B

20 to 100

C

500 to 750

D

1000 to 2000

In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

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