Q.1
Maximum size reduction in a fluid energy mill is achieved by
Q.2
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
Q.3
Sulphuric acid mist is arrested by using a __________ scrubber.
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
Q.5
Which one is a filter aid?
Q.6
Which of the following is not a cutting machine?
Q.7
__________ conveyors are also called scrapers.
Q.8
Coal is finally pulverised to 200 mesh size for burning in boilers by a
Q.9
Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)
Q.10
Which of the following is not a wet classifier?
Q.11
Pick out the wrong statement.
Q.12
Which of the following is the softest material?
Q.13
Work index is defined as the
Q.14
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
Q.15
Which of the following is the hardest material?
Q.16
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
Q.17
With increase in drum speed, in a rotary drum filter, the filtration rate
Q.18
The filter medium resistance is controlled by
Q.19
The energy consumed by a ball mill depends on
Q.20
Mixer used for rubber compounding is
Q.21
Electrical energy consumed by a jaw crusher is not a function of the
Q.22
Mixing of light fine powder such as insecticides is done by
Q.23
In a roll crusher, the specific power consumption and the production rate is affected by the
Q.24
Fluid medium used in the classification technique of mineral beneficiation is
Q.25
Mass flow of granular solid (M) through a circular opening of dia, D follows
Q.26
All resistances during washing of cake
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.
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
Q.29
Which of the following minerals is not subjected to magnetic separation method?
Q.30
To produce talcum powder, use
Q.31
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
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
Q.33
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
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 )
Q.35
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
Q.36
Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
Q.37
Which of the following is not used as a surface active agent in a flocculation operation?
Q.38
Gravity settling process is not involved in the working of a
Q.39
Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the
Q.40
Driving force in case of filtration by a centrifuge is the
Q.41
The main differentiation factor between tube mill and ball mill is the
Q.42
__________ is used for producing a thick suspension from a thin slurry.
Q.43
Which of the following is not a non-metalliferous mineral?
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?
Q.45
The most common filter aid is
Q.46
Froth floatation is the most suitable for treating
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
Q.48
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.
Q.49
The porosity of a compressible cake is
Q.50
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
0 h : 0 m : 1 s