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Q.1
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is
1.5
1
?2
None of these
Q.2
Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.
Impact
Roll
Vibratory
None of these
Q.3
A fluid energy mill is used for
Cutting
Grinding
Ultra grinding
Crushing
Q.4
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
Thickener
Classifier
Strainer
Clarifier
Q.5
Which of the following can be most effectively used for clarification of lube oil and printing ink?
Sparkler filter
Precoat filter
Disc-bowl centrifuge
Sharpies supercentrifuge
Q.6
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)
0.01 L.S
0.087 L.S
L.S
L.S/0.087
Q.7
Size measurement of ultrafine particles can be best expressed in terms of
Centimetre
Screen size
Micron
Surface area per unit mass
Q.8
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
State or manner of application of the crushing force
Ultimate strength of the material
Elastic constant of the material
All of the above
Q.9
The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
Piping
Cake
Filter medium
None of these
Q.10
Shape factor for a cylinder whose length equals its diameter is
1.5
0.5
1.0
2.0
Q.11
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the
Venturi atomiser
Gravity settling chamber
Electro-static precipitator
Cyclone separator
Q.12
The specific cake resistance for compressible sludges is a function of the pressure drop
Over cake
Over medium
Overall
None of these
Q.13
__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
Tumbler
Banbery
Muller
Rubbon blender
Q.14
The process opposite to 'dispersion' is termed as the
Flocculation
Sedimentation
Filtration
None of these
Q.15
Size reduction does not occur due to compression in case of
Rod mills
Gyratory crushers
Jaw crushers
Smooth roll crushers
Q.16
Percentage of drum submerged in the slurry in case of rotary drum filter is
3
30
85
25
Q.17
In froth floatation, chemical agent added to cause air adherence is called
Collector
Frother
Modifier
Activator
Q.18
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.
Plug
Turbulent
Laminar
None of these
Q.19
Screen capacity is not a function of
Its openings size
Screening mechanism
Screening surface
Atmospheric humidity
Q.20
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?
Rittinger's law
Kick's law
Bond's law
None of these
Q.21
Traces of solids are removed from, liquid in a
Classifier
Clarifier
Sparkler filter
Rotary vacuum filter
Q.22
Pick out the correct statement.
Plastic chips are called non-cohesive solids
Kick's crushing law is, P/m = K . ln #####
Communition is a generic term for size enlargement operation
Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'
Q.23
During filtration operation, the filtrate encounters the resistance of the
Filter medium
Cake
Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium
All of the above
Q.24
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.
Cast iron
Minimum size
Maximum size
Elliptical
Q.25
Mixing mechanism employed in a pan mixer is by
Mulling
Kneading
Dispersion
None of these
Q.26
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
At time zero
At the end of filtration
When half the filtrate has been obtained
At the end of filtration, but decreases with time subsequently
Q.27
In constant pressure filtration,
Resistance decreases with time
Rate of filtration is constant
Rate of filtration increases with time
Rate of filtration decreases with time
Q.28
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
Metalliferrous ores
Non-metallic ores
Basic slags
Asbestos & mica
Q.29
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
Weber
Peclet
Brinkman
Schmidt
Q.30
In case of a hammer crusher, the
Feed may be highly abrasive (Moh's scale >5)
Minimum product size is 3 mm
Maximum feed size may be 50 mm
Rotor shaft carrying hammers can be vertical or horizontal
Q.31
__________ mills are termed as disintegrators.
Cage
Compartment
Pebble
All of the above
Q.32
Which of the following is not categorised as a "mechanical operation"?
Agitation
Filtration
Size enlargement
Humidification
Q.33
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
0.5
1
√2
√3
Q.34
Optimum ratio of operating speed to critical speed of a trommel is
0.33-0.45
1.33-1.45
0.5-2
1.5-2.5
Q.35
Energy requirement (per unit mass of material crushed/ground) is highest for
Jaw crusher
Rod mill
Ball mill
Fluid energy mill
Q.36
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
< 5
10 to 25
< 74
> 1000
Q.37
Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
Μ > tan α
Μ ≥ tan α
Μ > tan 2α
Μ ≤ tan α
Q.38
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
Concentrate
Tailing
Middling
None of these
Q.39
Weber number is significant and is concerned with the
Solid-liquid mixing
Liquid-liquid mixing
Dispersion of liquid in liquid
Suspension of solid in liquid
Q.40
Handling of ashes and similar materials can be done best by a __________ conveyor.
Flight
Drag or slat
Belt
Ribbon
Q.41
Bond crushing law
Calls for relatively less energy for the smaller product particles, than does the Rittinger law
Is less realistic in estimating the power requirements of commercial crushers
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
States that the work required for the crushing is proportional to the new surface created
Q.42
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
Rod mill
Fluid energy mill
Gyratory crusher
Ball mill
Q.43
Float and sink test determines the possibility of cleaning of coal by a process based on the
Gravity separation
Wettability
Particle shape
None of these
Q.44
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
Parabola
Straight line
Hyperbola
Exponential curve
Q.45
Which of the following is a batch sedimentation equipment?
Dust catcher
Filter thickener
Dry cyclone separator
Rotary sprayer scrubber
Q.46
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
Vacuum
Sand
Plate & frame
Rotary
Q.47
Ball mills and tube mills with flint or porcelain balls are used for size reduction of
Asbestos
Rubber
Non-metallic ores
Limestone
Q.48
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
Increases
Decreases
Remains constant
Increases linearly
Q.49
Chance process is used for the
Cleaning of coal
Concentration of iron ore
Concentration of pyrites
Water treatment
Q.50
Compressibility co-efficient for an absolutely compressible cake is
0
1
0 to 1
∞
0 h : 0 m : 1 s
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