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Mechanical Operations

Mechanical Operations
Screen efficiency is

Recovery/rejection
Recovery
None of these
Rejection

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Decreasing size of product at constant size of feed
None of these
Decreasing machine capacity
Increasing size of feed at constant reduction ratio

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Mechanical Operations
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)

L.S/0.087
0.01 L.S
0.087 L.S
L.S

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

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Mechanical Operations
Size reduction does not occur due to compression in case of

Rod mills
Gyratory crushers
Jaw crushers
Smooth roll crushers

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Mechanical Operations
Which of the following must be stored in silos and not in open yard?

None of these
Sand
Coke breeze
High V.M. bituminous coal

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