Mechanical Operations For efficient grinding, ball mills must be operated With minimum possible small balls At a speed less than the critical speed At a speed more than the critical speed At a speed equal to the critical speed With minimum possible small balls At a speed less than the critical speed At a speed more than the critical speed At a speed equal to the critical speed ANSWER DOWNLOAD EXAMIANS APP
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 0.5 0.62 0.58 0.68 0.5 0.62 0.58 0.68 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) AD/V None of these π/6(=V/D³) π(=A/D²) AD/V None of these π/6(=V/D³) π(=A/D²) ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which one is a filter aid? None of these Convas fabric Calcined lime Diatomaceous earth None of these Convas fabric Calcined lime Diatomaceous earth ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In bag filters, filter fabrics are never made of Metallic wire woven mesh Cotton fibres Polyester fibres Nylon fibres Metallic wire woven mesh Cotton fibres Polyester fibres Nylon fibres ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations As particle size is reduced Screening becomes progressively easier Capacity and effectiveness of the screen is increased Screening becomes progressively more difficult None of these Screening becomes progressively easier Capacity and effectiveness of the screen is increased Screening becomes progressively more difficult None of these ANSWER DOWNLOAD EXAMIANS APP
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