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Q.1
Two particles are called to be equal settling, if they are having the same.
Size
Specific gravity
Terminal velocities in the same fluid & in the same field of force
None of these
Q.2
Which of the following must be stored in silos and not in open yard?
Coke breeze
High V.M. bituminous coal
Sand
None of these
Q.3
Raw materials are charged in the iron blast furnace using
Bucket elevator
Skip hoist
Screw conveyor
None of these
Q.4
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
Sedimentation
Flocculation
Dispersion
Centrifugation
Q.5
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)
3.6 AVS.ρ
3.6 A.V.ρ
3.6 A.S. ρ
3.6 AVS/ρ
Q.6
The value of 'angle of nip' is generally about
16°
32°
52°
64°
Q.7
A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
Compartment
Tube
Rod
Pebble
Q.8
Vertical transportation of materials can be done by a/an
Apron conveyor
Pneumatic conveyor
Bucket elevator
Both B & C
Q.9
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
Sphere
Cube
Cylinder (L/D = 1)
Raschig rings
Q.10
What is the selectivity index, if the grade of tailings & concentrate is the same?
0
∞
1
0.5
Q.11
Sphericity of raschig ring (whose length and diameter are equal) is
>1
<1
1
2
Q.12
Fluid energy mill comes in the category of
Grinder
Crusher
Cutter
Ultrafine grinder
Q.13
__________ mill is not a revolving mill.
Pebble
Compartment
Cage
Tube
Q.14
During size reduction by a jaw crusher, the energy consumed decreases with the
Decreasing size of product at constant size of feed
Decreasing machine capacity
Increasing size of feed at constant reduction ratio
None of these
Q.15
Which of the following is not a revolving/tumbling mill used for size reduction?
Compartment mill
Pebble mill
Cage mill
Rod mill
Q.16
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
π(=A/D²)
π/6(=V/D³)
AD/V
None of these
Q.17
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (N
p
) varies with N
Re
as
N
p
∝ N
Re
N
p
∝ √N
Re
N
p
→ constant
N
p
∝ 1/N
Re
Q.18
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
∝ ΔP
∝ 1/ ΔP
∝ √ΔP
Independent of ΔP
Q.19
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
0.5 D
D
1.5 D
2 D
Q.20
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
0.5 D
D
1.5 D
2 D
Q.21
Filter medium resistance is important during the __________ of filtration.
Early stages
Final stages
Entire process
None of these
Q.22
In closed circuit grinding as compared to open circuit grinding, the
Specific surface of product is more
Product has lesser size uniformity
Production rate at a given limiting size is lower
Operation is economical
Q.23
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
4
1/4
1
1/2
Q.24
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
Electromagnets
Cams or eccentric shafts
Unblanced fly wheels
Either A, B or C
Q.25
Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
Viscosity
Thermal conductivity
Surface tension
Density
Q.26
Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?
Bucket conveyor
Flight conveyor
Screw conveyor
Both B and C
Q.27
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?
Kozney-Karman equation
Leva
Blake-Plummer equation
None of these
Q.28
Specific surface area is the surface area of a unit __________ of materials.
Weight
Volume
Either A or B
Neither A nor B
Q.29
Colloidal mills are used for __________ grinding.
Coarse
Intermediate
Fine
Ultrafine
Q.30
Which of the following oxides is not present in hematite iron ore?
Titanium oxide
Calcium oxide
Cobalt oxide
Manganese oxide
Q.31
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
Compartment mill
Rod mill
Pebble mill
Tube mill
Q.32
Filtration rate does not depend upon the
Pressure drop & area of filtering surface
Resistance of the cake & the septum
Properties of the cake & the filtrate
None of these
Q.33
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is
2
√2
1.5
√3
Q.34
Equivalent diameter of a particle is the diameter of the sphere having the same
Ratio of surface to volume as the actual volume
Ratio of volume to surface as the particle
Volume as the particle
None of these
Q.35
Gizzlies are used for separating __________ solids.
Coarse
Fine
Any size
None of these
Q.36
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
Buhrstone mill
Ball mill
Crushing rolls
Hammer mill
Q.37
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
16°
32°
40°
46°
Q.38
Sauter mean diameter is the same as the __________ mean diameter.
Mass
Arithmetic
Volume-surface
Geometric
Q.39
Pine oil and cresylic acid are used as __________ in the froth floatation process.
Frother
Collector
Depressor
Conditioner
Q.40
Cyclones are used primarily for separating
Solids
Solids from fluids
Liquids
Solids from solids
Q.41
__________ centrifuge is normally used in sugar mills.
Tubular bowl
Disc-bowl
Suspended batch basket
Perforated horizontal basket continuous
Q.42
Grinding characteristic of a material is given by its
HGI
Angle of repose
Shatter index
Abrasion index
Q.43
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?
Trough washer
Baum jig washer
Spiral separator
Froth floatation
Q.44
For coarse reduction of hard solids, use
Impact
Attrition
Compression
Cutting
Q.45
200 mesh screen means 200 openings per
Cm²
Cm
Inch
Inch²
Q.46
Sedimentation on commercial scale occurs in
Classifiers
Thickeners
Rotary drum filters
Cyclones
Q.47
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be
0.5 Wi
Wi
1.34 Wi
3.34 Wi
Q.48
Shell and leaf filter as compared to plate and frame filter
Entails less labor cost
Facilitates filtration under higher pressure
Provides more effective washing
All of the above
Q.49
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
200°C and 5 atm
1000°C and 10 atm
500°C and 50 atm
1000°C and 500 atm
Q.50
The inlet pressure in a constant rate filtration
Increases continuously
Decreases gradually
Remains constant
None of these
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