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

1.5 D

0.5 D

2 D

D

1.5 D

0.5 D

2 D

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Mechanical Operations
Dispersion of a gas through liquid is done by using a

Sparger

Masticator

Kneader

None of these

Sparger

Masticator

Kneader

None of these

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Mechanical Operations
__________ is the most suitable for compounding rubber and plastic solids.

Pug mill

Charge can mixer

Banbery mixer

Pan mixer

Pug mill

Charge can mixer

Banbery mixer

Pan mixer

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Mechanical Operations
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?

Curved blade turbine

Helical screw

Propeller

Flat blade turbine

Curved blade turbine

Helical screw

Propeller

Flat blade turbine

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Mechanical Operations
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Dry grindng of large particles in un-baffed mills

Wet grinding in low viscous suspension

Dry grinding of large particles (upto 1.25 cms)

Wet grinding in high viscous suspension

Dry grindng of large particles in un-baffed mills

Wet grinding in low viscous suspension

Dry grinding of large particles (upto 1.25 cms)

Wet grinding in high viscous suspension

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Mechanical Operations
Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.

50 to 100

100 to 250

5 to 25

0.2 to 0.8

50 to 100

100 to 250

5 to 25

0.2 to 0.8

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Mechanical Operations

Mechanical Operations Dispersion of a gas through liquid is done by using a

Mechanical Operations __________ is the most suitable for compounding rubber and plastic solids.

Mechanical Operations Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?

Mechanical Operations Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Mechanical Operations Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.

Mechanical Operations
Dispersion of a gas through liquid is done by using a

Mechanical Operations
__________ is the most suitable for compounding rubber and plastic solids.

Mechanical Operations
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?

Mechanical Operations
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Mechanical Operations
Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.