Mechanical Operations

201. Maximum size reduction in a fluid energy mill is achieved by

1. Compression
2. Interparticle attrition
3. Cutting
4. Impact

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202. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟?

1. Bucket conveyor
2. Flight conveyor
3. Screw conveyor
4. Both (B) and (C)

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203. Mesh indicates the number of holes per

1. Square inch
2. Linear inch
3. Square foot
4. Linear foot

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204. Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an

1. Air filter
2. Bag filter
3. Venturi scrubber
4. Hydrocyclones

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205. Mixer used for rubber compounding is

1. mixer-extruder
2. Banbury internal mixer
3. Muller mixer
4. Pug mill

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206. Mixing mechanism employed in a pan mixer is by

1. Mulling
2. Kneading
3. Dispersion
4. None of these

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207. Mixing of light fine powder such as insecticides is done by

1. Banbury mixer
2. Pug mill
3. Impact wheels
4. Kneader

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208. Mixing of plastic solids is generally facilitated by

1. Dispersion
2. Mastication
3. Kneading
4. None of these

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209. Moisture can be removed from lubricating oil using

1. Tubular centrifuge
2. Clarifier
3. Sparkler filter
4. Vacuum leaf filter

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210. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a

1. Pug mill
2. Mixer-extruder
3. Banbury mixer
4. Muller mixer

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