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Quiz 7
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Q.1
Jigging is a technique by which different particles can be
Separated by particle size
Separated by particle density
Separated by particle shape
Mixed
Q.2
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
Clarification
Sedimentation
Flocculation
Classification
Q.3
Pick out the correct statement.
Angle of repose is always greater than the angle of slide
A hopper is a small bin with a sloping bottom
A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal
Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process
Q.4
Wheat is ground into flour in a
Hammer crusher
Roller crusher
Impact mill
Fluid energy mill
Q.5
Which is a secondary crusher for a hard & tough stone?
Jaw crusher
Cone crusher
Impact crusher
Toothed roll crusher
Q.6
To get a fine talc powder from its granules, the equipment used is
Roller crusher
Ball mill
Jaw crusher
Gyratory crusher
Q.7
Removal of activated carbon from glycerine is done by
Plate and frame filter
Rotary vacuum filter
Batch basket centrifuge
None of these
Q.8
Pick out the wrong statement:
Magnetic separation method can be employed to treat both dry & wet ores
Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size
Gyratory crusher is used for coarse crushing
Screens are of stationary, moving and vibratory types
Q.9
__________ mills fall in the category of tumbling mills,
Ball and pebble
Rod and tube
Compartment
All of the above
Q.10
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
Linear speed of the basket is doubled
Linear speed of the basket is halved
Centrifugal force is doubled
Capacity of centrifuge is increased
Q.11
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
>10
<10
>100
<100
Q.12
The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.
Same as
2.5 times
5 times
10 times
Q.13
For classification of potable (drinking) water, we use a __________ filter.
Gravity sand
Plate and frame
Vacuum leaf
Rotary vacuum
Q.14
Which of the following is not an ultrafine grinder (colloid mill)?
Micronizers
Agitated mills and fluid energy mills
Toothed roll crusher
Hammer mills with internal classification
Q.15
Which of the following comes in the category of primary crusher for hard and tough stone?
Jaw crusher
Cone crusher
Gyratory crusher
None of these
Q.16
Choke crushing (in case of a Jaw crusher) compared to free crushing
Results in increased capacity
Consumes less power
Consumes more power
Both A and C
Q.17
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
10
25
50
75
Q.18
Stamp mills are generally used for crushing
Iron ores
Gold ores
Talc
Diamond
Q.19
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Sand bed filter
Plate and frame filter press
Vacuum filter
Batch basket centrifuge
Q.20
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Sand bed filter
Plate and frame filter press
Vacuum filter
Batch basket centrifuge
Q.21
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.
Compressible cakes and laminar
Incompressible cake and laminar
Compressible cake and turbulent
Incompressible cake and turbulent
Q.22
Balls for ball mills are never made of
Forged/cast steel
Lead
Cast iron
Alloy steel
Q.23
Which of the following may prove unsuitable for filtering volatile liquids?
Pressure filter
Gravity filter
Centrifugal filter
Vacuum filter
Q.24
Which is the most suitable conveyor for transportation of sticky material?
Apron conveyor
Belt conveyor
Screw conveyor
Pneumatic conveyor
Q.25
Filtration should be stopped in a filter press, if the
Cake becomes very dense
Liquor stops flowing out to the discharge
Filtration pressure rises suddenly
Both A & B
Q.26
To remove very small amount of tiny solid impurities from liquid, we use a
Pressure filter
Vacuum filter
Centrifugal filter
Coagulant
Q.27
A belt conveyor used for the transportation of materials can
Run upto 1 km
Travel at a speed upto 300 metres/minute
Handle materials upto 5000 tons/hr
All of the above
Q.28
Sphericity of pulverised coal is
1
<1
>1
∞
Q.29
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
Rate
Pressure
Both A & B
Neither A nor B
Q.30
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
The new surface created
The size reduction ratio
The change in volume due to crushing
None of these
Q.31
Xanthates are used in the froth floatation process as a/an
Conditioner
Frother
Collector
Activator
Q.32
Use of grinding aids results in the
Enhanced production rate
Finer products
Both A & B
Neither A nor B
Q.33
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?
Wet grinding in low viscous suspension
Wet grinding in high viscous suspension
Dry grinding of large particles (upto 1.25 cms)
Dry grindng of large particles in un-baffed mills
Q.34
The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a
Boundary mixer
Propeller agitator
Sharpies centrifuge
None of these
Q.35
Cement clinker is reduced to fine size by a
Roll crusher
Ball mill
Tube mill
Hammer mill
Q.36
The speed of a rotary drum vacuum filter may be about __________ rpm.
1
50
100
500
Q.37
To remove dirt from the flowing fluid, we use a
Coagulant
Gravity settler
Strains
Clarifier
Q.38
Highly viscous liquids & pastes are agitated by
Propellers
Turbine agitators
Multiple blade paddles
None of these
Q.39
The process by which fine solids is removed from liquids is termed as
Decantation
Flocculation
Sedimentation
Classification
Q.40
The mechanism of size reduction by a hammer mill is by impact and attrition between the
Grinding element & the housing
Feed particles
Both A & B
Neither A nor B
Q.41
Dispersion of a gas through liquid is done by using a
Sparger
Kneader
Masticator
None of these
Q.42
Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
Filtering
Washing
Drying
All of the above
Q.43
Pick out the wrong statement.
Recycled coarse material to the grinder by a classifier is termed as circulating load
Wear and tear in wet crushing is more than that in dry crushing of materials
Size enlargement (opposite of size reduction) is not a mechanical operation
A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas
Q.44
The unit of specific cake resistance is
Gm/cm²
Cm/gm
Cm/gm²
Gm/gm
Q.45
Reciprocal of sphericity is termed as the
Specific surface ratio
Shape factor
Sauter diameter
Surface area per unit mass
Q.46
Rod mills employed for grinding
Employ a steel shell having L/D ratio of 1.5 to 3.0
Is useful for handling sticky materials
Employ steel rods of 2-12 cms diameter extending over full length of the mill
All of the above
Q.47
Ultra centrifuges are used for the separation of __________ solid particles.
Coarse
Fine
Colloidal
Dissolved
Q.48
The term 'angle of nip' is concerned with the operation of the __________ crushers.
Jaw
Roll
Gyratory
None of these
Q.49
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
Classification
Tabling
Jigging
Froth floatation
Q.50
Which of the following gives the crushing energy required to create new surface ?
Taggarts rule
Fick's law
Rittinger's law
None of these
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