Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Size

Porosity

Durability

Cost

Size

Porosity

Durability

Cost

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Rag paper

Anthracite coal

Inorganic solids

Bamboo

Rag paper

Anthracite coal

Inorganic solids

Bamboo

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Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Surface renewal

Film

Penetration

None of these

Surface renewal

Film

Penetration

None of these

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

1

1.56

0.56

2

1

1.56

0.56

2

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points

Driving force for the vapour flow is the pressure drop

None of these

Pressure increases gradually from bottom to the top of the column

Liquids are not always at their bubble points

Driving force for the vapour flow is the pressure drop

None of these

Pressure increases gradually from bottom to the top of the column

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Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Rotary dryer is suitable for drying sticky material

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Rotary dryer is suitable for drying sticky material

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Mass Transfer

Mass Transfer Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Mass Transfer Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Mass Transfer Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Mass Transfer Inside the distillation column, the

Mass Transfer Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Mass Transfer
Inside the distillation column, the

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.