Mechanical Operations

1. The important dimensional group involved in the power requirement calculation in mixing operation is the _________ number.

1. Reynold's
2. Froude
3. Both (A) & (B)
4. Neither (A) nor (B)

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2. _________ are mixed using ribbon blenders.

1. Lumpy solids and low viscosity liquids
2. Dry powders
3. High viscosity liquids
4. Thick pastes

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3. _________ are used for the separation of coarse particles from a slurry of fine particles.

1. Thickeners
2. Classifiers
3. Hydrocyclones
4. Decanters

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4. _________ baffles are provided in ball mills.

1. Horizontal
2. No
3. Only two
4. None of these

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5. _________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.

1. Cast iron
2. Minimum size
3. Maximum size
4. Elliptical

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6. _________ Centrifuge is normally used in sugar mills.

1. Tubular bowl
2. Disc-bowl
3. Suspended batch basket
4. Perforated horizontal basket continuous

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7. _________ centrifuge is the most suitable for separation of non-friable crystals.

1. Tubular bowl
2. Disc-bowl
3. Perforated horizontal basket continuous
4. Suspended batch basket

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8. _________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials.

1. Bucket
2. Belt
3. Screw
4. Apron

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9. _________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.

1. Flight
2. Screw
3. Drag
4. Belt

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10. _________ conveyors are also called scrapers.

1. Apron
2. Screw
3. Helical flight
4. Both (B) & (C)

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