Mechanical Operations

291. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant _________ filtration.

1. Rate
2. Pressure
3. Both (A) & (B)
4. Neither (A) nor (B)

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292. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the _________ of the belt.

1. Speed
2. Thickness
3. Length
4. None of these

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293. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area in m₂, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m₃)

1. 3.6 AVS.ρ
2. 3.6 A.V.ρ
3. 3.6 A.S. ρ
4. 3.6 AVS/ρ

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294. The capacity of a gyratory crusher is _________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

1. Same as
2. 2.5 times
3. 5 times
4. 10 times

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295. The capacity of a pneumatic conveying system depends upon the

1. Bulk density of materials
2. Pressure of the conveying air
3. Diameter of the conveying line
4. All (A), (B) and (C)

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296. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

1. Feed material
2. Type of crushing machine
3. Both (A) & (B)
4. Neither (A) nor (B)

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297. The controlling resistance in a rotary drum vacuum filter is the _________ resistance.

1. Piping
2. Cake
3. Filter medium
4. None of these

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298. The critical speed of a trommel (N) is related to its dia (D) as

1. N ∝ 1/√D
2. N ∝ √D
3. N ∝ D
4. N ∝ 1/D

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299. The crushed material received for separation is called feed or

1. Tailing
2. Heading
3. Concentrate
4. MiD⁵ling

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300. The energy consumed by a ball mill depends on

1. Its speed
2. Its ball load
3. The density of the material being ground
4. All (A), (B) and (C)

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