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Q.1
Maximum size reduction in a fluid energy mill is achieved by
Compression
Interparticle attrition
Cutting
Impact
Q.2
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
Drag
Ribbon
Screw
Slat
Q.3
Sulphuric acid mist is arrested by using a __________ scrubber.
Packed wet
Hollow wet
Venturi
Co-current
Q.4
For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is
2250
1125
460
230
Q.5
Which one is a filter aid?
Convas fabric
Diatomaceous earth
Calcined lime
None of these
Q.6
Which of the following is not a cutting machine?
Dicers
Knife cutters
Slitters
Tube mills
Q.7
__________ conveyors are also called scrapers.
Apron
Screw
Helical flight
Both B & C
Q.8
Coal is finally pulverised to 200 mesh size for burning in boilers by a
Hammer crusher
Ball mill
Roll crusher
Gyratory crusher
Q.9
Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)
S
1/R
1/μ
All of the above
Q.10
Which of the following is not a wet classifier?
Sharpies supercentrifuge
Hydrocyclones
Dorr Oliver rake classifier
None of these
Q.11
Pick out the wrong statement.
Cake resistance is independent of the pressure drop
For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant
Crushing of explosive materials are done by employing drygrinding
Gyratory crusher is a coarse crusher
Q.12
Which of the following is the softest material?
Talc
Feldspar
Corundum
Calcite
Q.13
Work index is defined as the
Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Energy needed to crush one tonne of feed to 200 microns
Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
Energy needed to crush one ton of feed to 100 microns
Q.14
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
20
12
8
2
Q.15
Which of the following is the hardest material?
Calcite
Quartz
Corundum
Gypsum
Q.16
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
Flight
Slat or drag
Ribbon
Screw
Q.17
With increase in drum speed, in a rotary drum filter, the filtration rate
Increases
Increases linearly
Decreases
Is not affected
Q.18
The filter medium resistance is controlled by
Pressure drop alone
Flow rate alone
Both pressure drop and flow rate
Cake thickness
Q.19
The energy consumed by a ball mill depends on
Its speed
Its ball load
The density of the material being ground
All of the above
Q.20
Mixer used for rubber compounding is
Mixer-extruder
Banbury internal mixer
Muller mixer
Pug mill
Q.21
Electrical energy consumed by a jaw crusher is not a function of the
Average feed size
Average product size
Machine capacity
None of these
Q.22
Mixing of light fine powder such as insecticides is done by
Banbery mixer
Pug mill
Impact wheels
Kneader
Q.23
In a roll crusher, the specific power consumption and the production rate is affected by the
Reduction ratio
Differential roll speed
Both A & B
Neither A nor B
Q.24
Fluid medium used in the classification technique of mineral beneficiation is
Air
Water
Both A & B
Neither A nor B
Q.25
Mass flow of granular solid (M) through a circular opening of dia, D follows
M ∝ √D
M ∝ D²
M ∝ D³
M ∝ D
Q.26
All resistances during washing of cake
Increases
Decreases
Remain constant
None of these
Q.27
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.
Primary
Secondary
Fine
Ultrafine
Q.28
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is
KW. sec/kg
KWh/kg
KWh/sec. kg
Kg/sec
Q.29
Which of the following minerals is not subjected to magnetic separation method?
Rutile
Galena
Chromite
Siderite
Q.30
To produce talcum powder, use
Ball mill
Hammer mill
Jet mill
Pin mill
Q.31
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
Particle sizes
Densities
Terminal velocities
None of these
Q.32
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
Bronze
Stainless steel
Flint or porcelain
Concrete
Q.33
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
Resins
Gums
Hard rubber
Waxes
Q.34
As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms )
LS
93 LS
250 LS
√LS
Q.35
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
Classification
Froth floatation
Thickening
Clarification
Q.36
Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
Decreases
Increases
Remains unchanged
May increase or decrease; depends on the machine
Q.37
Which of the following is not used as a surface active agent in a flocculation operation?
Sodium silicate
Quartz
Lime
Alumina
Q.38
Gravity settling process is not involved in the working of a
Hydrocyclone
Classifier
Dorr-thickener
Sedimentation tank
Q.39
Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the
Blake jaw crusher
Cage mill
Stamp mill
Bradford's breaker
Q.40
Driving force in case of filtration by a centrifuge is the
Speed of the centrifuge
Centrifugal pressure exerted by the liquid
Narrow diameter of the vessel
Formation of highly porous cake
Q.41
The main differentiation factor between tube mill and ball mill is the
Length to diameter ratio
Size of the grinding media
Final product size
Operating speed
Q.42
__________ is used for producing a thick suspension from a thin slurry.
Cartridge filter
Rotary drum vacuum filter
Pressure filter thickener
Plate and frame filter press
Q.43
Which of the following is not a non-metalliferous mineral?
Calcite
Fluorspar
Quartz
Cassiterrite
Q.44
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?
Cresylic acid
Copper sulphate
Calcium carbonate
Sodium carbonate
Q.45
The most common filter aid is
Diatomaceous earth
Calcium silicate
Sodium carbonate
Silica gel
Q.46
Froth floatation is the most suitable for treating
Iron ores
Sulphide ores
Quartzite
None of these
Q.47
Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the
Light metal powder down upto 4 meshsize
Dry chemicals
Heavy tonnages of rocks or gravel
Powdered food & granular materials
Q.48
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.
Blake jaw
Toothed roll
Gyratory
None of these
Q.49
The porosity of a compressible cake is
Minimum at the filter medium
Minimum at the upstream face
Maximum at the filter medium
Same throughout the thickness of cake
Q.50
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
Jaw crusher, Ball mill, Fluid energy mill
Ball mill, Jaw crusher, Fluid energy mill
Fluid energy mill, Jaw crusher, Ball mill
Fluid energy mill, Ball mill, Jaw crusher
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