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Quiz 6
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Q.1
The maximum slope of a belt conveyor can be
15°
30°
45°
60°
Q.2
During agitation of liquids, power consumption during laminar flow is not proportional to the
Density of the liquid
Viscosity of the liquid
Cube of impeller diameters
Square of rotational speed
Q.3
Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.
Plane
Curved
Ribbed
Either A or B
Q.4
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
Plate & frame
Shell & leaf
Sand
Rotary vacuum
Q.5
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
British standard screens
German standard screens (DIN 1171) etc
American standard screens (ASTM and Tyler standard screens)
All of the above
Q.6
__________ mills are termed as impactors.
Hammer
Cage
Rolling-compression
None of these
Q.7
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
Bag filter
Electrostatic precipitator
Cyclone separator
Wet scrubber
Q.8
Which of the following is a continuous filter?
Plate and frame filter
Cartridge filter
Shell and leaf filter
None of these
Q.9
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.
Buhrstone
Roller
Attrition
Pebble
Q.10
Traces of liquid tar fog present in coke oven gas is separated using
Electrostatic precipitator
Cyclone separator
Strainer
None of these
Q.11
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.
0.007
0.30
50
0.014
Q.12
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
N°
N¹
N²
N³
Q.13
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
Sparkler
Plate and frame
Vacuum leaf
Precoat
Q.14
The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
Speed
Thickness
Length
None of these
Q.15
Use of baffles in agitators help in minimising the __________ tendency.
Swirling
Vortexing
Both A & B
Neither A nor B
Q.16
Pick out the wrong statement pertaining to the turbine agitator.
Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diamete
Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators sh
Q.17
A gravity decanter is meant for the separation of two __________ density.
Immiscible liquids of different
Miscible liquids of different
Immiscible liquids of same
Miscible liquids of same
Q.18
In paint industries, blending of light paste is done by using a
Masticator
Charge can mixer
Kneader
None of these
Q.19
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m³)
3.6 W.D.V.ρ
3.6 W.D.V.
3.6 W.V.ρ
3.6 D.V.ρ
Q.20
Close circuit grinding by a ball mill with air sweeping employs a
Classifier
Cyclone separator between mill & classifier
Both A & B
Neither A nor B
Q.21
The sphericity of a cylinder of 1 mm diameter and length 3 mm is
0.9
0.78
0.6
0.5
Q.22
Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about
1 to 2°
2 to 5°
5 to 10°
10 to 15°
Q.23
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
Constant rate
Varying pressure
Varying rate
Constant pressure
Q.24
In case of a ball mill,
Coarse feed requires a larger ball
Fine feed requires a larger ball
Operating speed should be more than the critical speed
None of these
Q.25
In case of a hammer crusher,
Crushing takes place by impact breaking
Maximum acceptable feed size is 30 cms
Reduction ratio can be varied by adjusting the distance from cage to hammers
All of the above
Q.26
Which of the following is not used as a filter medium in case of corrosive liquids?
Nylon
Glass cloth
Metal cloth of monel or stainless steel
Cotton fabric
Q.27
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, V
p
= volume of one particle, ρ= density of particles)
M/ρ . V
p
M . ρ/V
p
M . V
p
/ρ
V
p
/m . ρ
Q.28
Filter medium resistance is that offered by the
Filter cloth
Embedded particles in the septum
Filter cloth and the embedded particle collectively
None of these
Q.29
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
Jet mills
Fluid energy mill
Micronizer
All of the above
Q.30
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).
6.V/D.S
V/6D.S
D.S/V
V/D.S
Q.31
The reduction ratio for fine grinders is
5-10
10-20
20-40
As high as 100
Q.32
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?
Propeller
Helical screw
Flat blade turbine
Curved blade turbine
Q.33
Which of the following is a pressure filter?
Leaf filter (Moore filter)
Plate and flame filter
Rotary drum filter
Sand filter
Q.34
__________ mill is normally used for grinding of talc.
Tube
Compartment
Ring-roll
Pebble
Q.35
Which of the following is not used as filter aid?
Asbestos
Diatomaceous earth
Purified wood cellulose
Rice husk
Q.36
__________ is the most suitable for compounding rubber and plastic solids.
Banbery mixer
Pan mixer
Pug mill
Charge can mixer
Q.37
A tube mill as compared to a ball mill
Employs smaller balls
Gives finer size reduction but consumes more power
Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
All of the above
Q.38
Tank filter (e.g., Nutsch filter) is
A high pressure filter
A continuous filter
Used for small scale filtration work
A leaf filter
Q.39
Toothed roll crushers achieve size reduction by
Tearing (shear) and compression
Impact and attrition
Both A & B
Neither A nor B
Q.40
Colloid mills achieve size reduction mainly by
Impact
Attrition
Cutting
Compression
Q.41
Addition of filter aid to the slurry before filtration is done to ...... of the cake.
Increase the porosity
Increase the compressibility co-efficient
Decrease the porosity
Decrease the compressibility co-efficient
Q.42
Fibrous material is broken by a
Rollcrusher
Squirrel-cage disintegrator
Ball mill
Tube mill
Q.43
Mesh indicates the number of holes per
Square inch
Linear inch
Square foot
Linear foot
Q.44
Size reduction mechanism used in Jaw crushers is
Attrition
Compression
Cutting
Impact
Q.45
Width and speed of a conveyor belt depends upon the __________ of the material.
Lump size
Bulk density
Both A & B
Neither A nor B
Q.46
The crushed material received for separation is called feed or
Tailing
Heading
Concentrate
Middling
Q.47
Vacuum filter is most suitable for the
Removal of fines from liquid
Liquids having high vapour pressure
Liquids of very high viscosity
None of these
Q.48
Solid particles separation based on the difference in their flow velocities through fluids is termed as the
Clarification
Classification
Elutriation
Sedimentation
Q.49
Soft & non-abrasive materials can be made into fines by
Attrition
Compression
Cutting
None of these
Q.50
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
Comminution
Dispersion
Pulverisation
Compression
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