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Mechanical Operations

Mechanical Operations
Percentage of drum submerged in the slurry in case of rotary drum filter is

25
85
3
30

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Mechanical Operations
The porosity of a compressible cake is

Same throughout the thickness of cake
Maximum at the filter medium
Minimum at the filter medium
Minimum at the upstream face

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Mechanical Operations
The capacity of a pneumatic conveying system depends upon the

Pressure of the conveying air
All of these
Bulk density of materials
Diameter of the conveying line

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Mechanical Operations
Which of the following is a batch sedimentation equipment?

Dust catcher
Filter thickener
Rotary sprayer scrubber
Dry cyclone separator

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Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.68
0.62
0.5
0.58

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Mechanical Operations
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Tube mill
Ball mill
Jaw crusher
Hammer crusher

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