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Mechanical Operations

Mechanical Operations
Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a

Muller mixer
Banbury mixer
Pug mill
Mixer-extruder

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Mechanical Operations
The opening of a 200 mesh screen (Taylor series) is

0.0074 mm
0.0047 cm
74 mili-microns
0.0074 cm

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Mechanical Operations
Cake resistance is

Decreased with the time of filtration
Important in the beginning of filtration
Independent of pressure drop
None of these

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Mechanical Operations
Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).

1/√μ
1/μ
√μ
1/μ²

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

2 D
1.5 D
D
0.5 D

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Mechanical Operations
Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its

High power consumption in grinding
Easier grindability
Poor grindability
None of these

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