Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D

0.5 D

2 D

1.5 D

D

0.5 D

2 D

1.5 D

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Mechanical Operations
Helical screw agitator is used for

Blending immiscible liquids

None of these

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

Mixing highly viscous pastes

Blending immiscible liquids

None of these

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

Mixing highly viscous pastes

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Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Differential wettability

Size

Density separation

Volatile matter content

Differential wettability

Size

Density separation

Volatile matter content

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Mechanical Operations
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.

Varying pressure

Constant pressure

Constant rate

Varying rate

Varying pressure

Constant pressure

Constant rate

Varying rate

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Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Linear speed of the basket is doubled

Linear speed of the basket is halved

Capacity of centrifuge is increased

Centrifugal force is doubled

Linear speed of the basket is doubled

Linear speed of the basket is halved

Capacity of centrifuge is increased

Centrifugal force is doubled

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Mechanical Operations
As particle size is reduced

Capacity and effectiveness of the screen is increased

Screening becomes progressively more difficult

None of these

Screening becomes progressively easier

Capacity and effectiveness of the screen is increased

Screening becomes progressively more difficult

None of these

Screening becomes progressively easier

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Mechanical Operations

Mechanical Operations Helical screw agitator is used for

Mechanical Operations Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Mechanical Operations Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.

Mechanical Operations If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Mechanical Operations As particle size is reduced

Mechanical Operations
Helical screw agitator is used for

Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Mechanical Operations
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.

Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Mechanical Operations
As particle size is reduced