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Mechanical Operations

Mechanical Operations
Which of the following is a fine crusher?

Toothed roll crusher
Dodge jaw crusher
Blake jaw crusher
Gyratory crusher

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Mechanical Operations
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

At the end of filtration, but decreases with time subsequently
At time zero
When half the filtrate has been obtained
At the end of filtration

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.5
Po ∝ Re0.0
Po ∝ Re1.0
Po ∝ Re-1.0

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Mechanical Operations
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.

Plate and frame
Vacuum leaf
Sparkler
Precoat

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Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Cresylic acid
Calcium carbonate
Copper sulphate
Sodium carbonate

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Mechanical Operations
As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms )

√LS
250 LS
93 LS
LS

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