Mechanical Operations

191. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

1. 4
2. 43922
3. 1
4. 43862

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192. increasing the capacity of a screen _________ the screen effectiveness.

1. Decreases
2. Increases
3. Does not effect
4. None of these

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193. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _________ surface.

1. Plane
2. Curved
3. Ribbed
4. Either (A) or (B)

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194. Jigging is a technique by which different particles can be

1. Separated by particle size
2. Separated by particle density
3. Separated by particle shape
4. Mixed

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195. Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

1. kW. sec/kg
2. kWh/kg
3. kWh/sec. kg
4. kg/sec

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196. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

1. > 10
2. < 10
3. > 100
4. < 100

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197. Length/diameter ratio of a ball mill is

1. 1.5
2. 1
3. < 1
4. > 1

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198. Limestone is normally crushed in a

1. Roll crusher
2. Hammer crusher
3. Ball mill
4. Tube mill

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199. Mass flow of granular solid (M) through a circular opening of dia, D follows

1. M ∝ √D
2. M ∝ D²
3. M ∝ D³
4. M ∝ D

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200. Maximum size reduction in a ball mill is done by the, _________ action.

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

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