Category: Mechanical Operations

Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about________________?

Hamad Mechanical Operations 04/07/2020

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A. 1 to 2°
B. 2 to 5°
C. 5 to 10°
D. 10 to 15°

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) ?

Hamad Mechanical Operations 04/07/2020

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A. 0.01 L.S
B. 0.087 L.S
C. L.S
D. L.S/0.087

Screen capacity is proportional to (where, S = screen aperture)____________________?

Hamad Mechanical Operations 30/06/2020

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A. S
B. 1/S
C. S2
D. √S

For separation of sugar solution from settled out mud, we use a ___________________ filter?

Hamad Mechanical Operations 23/06/2020

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A. Sparkler
B. Plate and frame
C. Centrifugal
D. Rotary drum vacuum

Froth floatation is the most suitable for treating ____________________?

Hamad Mechanical Operations 22/06/2020

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A. Iron ores
B. Sulphide ores
C. Quartzite
D. None of these

Wet sieving is employed, when the product contains ________________ materials?

Hamad Mechanical Operations 22/06/2020

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A. Abrasive
B. Large quantity of very fine
C. Coarse
D. Non-sticky

A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ___________________?

Hamad Mechanical Operations 16/06/2020

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A. ½w2 . R2 . ρL
B. ½w2 . δ2 . ρL
C. ½w2 . δρL (2R + δ)
D. ½w2 . R . ρL(R + 2δ)

The process opposite to ‘dispersion’ is termed as the___________________?

Hamad Mechanical Operations 15/06/2020

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A. Flocculation
B. Sedimentation
C. Filtration
D. None of these

For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?

Hamad Mechanical Operations 12/06/2020

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A. 5
B. 50
C. 500
D. 5000

Traces of liquid tar fog present in coke oven gas is separated using____________________?

Hamad Mechanical Operations 10/06/2020

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A. Electrostatic precipitator
B. Cyclone separator
C. Strainer
D. None of these