Q.1
For transporting pasty material, one will use a/an
Q.2
Pick out the wrong statement.
Q.3
Pick out the wrong statement.
Q.4
Gravity stamp mill is meant for the __________ crushing.
Q.5
In the cyclone separator used for separation of dust from dust laden gas, the gas
Q.6
All resistances during washing of cake
Q.7
For raschig rings, the sphericity is
Q.8
Pick out the wrong statement.
Q.9
Screen efficiency is
Q.10
Which of the following conveyors cannot be recommended for transportation of abrasive materials?
Q.11
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by
Q.12
__________ is the most commonly used 'filter aid'.
Q.13
Tube mill compared to ball mill
Q.14
Pick out the wrong statement.
Q.15
Horsepower required for a roll crusher is directly proportional to its
Q.16
Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.
Q.17
The study on washability of coal is done by using the __________ technique.
Q.18
Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a
Q.19
Limestone is normally crushed in a
Q.20
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
Q.21
Screw conveyors are
Q.22
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.
Q.23
Use of 'grinding aids' is done in __________ grinding.
Q.24
The work index in Bond's law for crushing of solids has the following dimensions
Q.25
A screen is said to be blinded, when the
Q.26
During agitation of liquids, the
Q.27
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is
Q.28
According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).
Q.29
Angle of nip of the crushing rolls does not depend upon the
Q.30
The distribution given by microscopic analysis of powder is
Q.31
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.
Q.32
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)
Q.33
__________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.
Q.34
Pick out the wrong statement pertaining to the roll crushers.
Q.35
Dry powdery solid materials are transported by a __________ conveyor.
Q.36
Filtration capacity of a rotary drum vacuum filter depends upon the
Q.37
__________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
Q.38
Moisture can be removed from lubricating oil using
Q.39
The capacity of a pneumatic conveying system depends upon the
Q.40
In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
Q.41
For the preliminary breaking of hard rock, we use a
Q.42
Separation of materials into products based on the difference of their sizes is called
Q.43
For spheres, the specific surface shape factor is given by
Q.44
For a non-spherical particle, the sphericity
Q.45
Ultrafine grinders operate principally by
Q.46
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the
Q.47
The filtrate flow rate in constant pressure filtration
Q.48
Which of the following achieves the least reduction ratio for a given feed size?
Q.49
The critical speed of a trommel (N) is related to its dia (D) as
Q.50
Cartridge filters are termed as 'edge' filters, because of the fact that the
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