Mechanical Operations

261. Shell and leaf filter as compared to plate and frame filter

1. Entails less labor cost
2. Facilitates filtration under higher pressure
3. Provides more effective washing
4. All (A), (B) & (C)

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262. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a _________ conveyor.

1. Flight
2. Slat or drag
3. Ribbon
4. Screw

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263. Size measurement of ultrafine particles can be best expressed in terms of

1. Centimetre
2. Screen size
3. Micron
4. Surface area per unit mass

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264. Size reduction does not occur due to compression in case of

1. Rod mills
2. Gyratory crushers
3. Jaw crushers
4. Smooth roll crushers

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265. Size reduction mechanism used in Jaw crushers is

1. Attrition
2. Compression
3. Cutting
4. Impact

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266. Size reduction of _________ is accomplished in steam heated rollers and roll crushers.

1. Resins
2. Gums
3. Hard rubber
4. Waxes

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267. Size reduction of asbestos and mica is done by

1. Hammer mills
2. Rod mills
3. Gyratory crushers
4. Crushing rolls

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268. Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the

1. Blake jaw crusher
2. Cage mill
3. Stamp mill
4. Bradford's breaker

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269. Size reduction of ice and gypsum can be accomplished suitably by a _________ crusher.

1. Blake jaw
2. Toothed roll
3. Gyratory
4. None of these

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270. Size reduction of moulding powders, waxes, resins & gums are done in a _________ mill.

1. Cage
2. Hammer
3. Both (A) & (B)
4. Neither (A) nor (B)

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