Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.
Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.
Cyclones are used primarily for separating
Cyclones are used primarily for separating
__________ centrifuge is normally used in sugar mills.
__________ centrifuge is normally used in sugar mills.
In closed circuit grinding as compared to open circuit grinding, the
In closed circuit grinding as compared to open circuit grinding, the
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?
Two particles are called to be equal settling, if they are having the same.
Two particles are called to be equal settling, if they are having the same.
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
Colloidal mills are used for __________ grinding.
Colloidal mills are used for __________ grinding.
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is
A widely used size reduction equipment for __________ is Bradford breaker.
A widely used size reduction equipment for __________ is Bradford breaker.
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).
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).
The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
For coarse reduction of hard solids, use
For coarse reduction of hard solids, use
Specific surface area is the surface area of a unit __________ of materials.
Specific surface area is the surface area of a unit __________ of materials.
In classification, particles are said to be equal settling, if they have the same terminal velocities in the
In classification, particles are said to be equal settling, if they have the same terminal velocities in the
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
Which of the following can be most effectively used for clarification of lube oil and printing ink?
Which of the following can be most effectively used for clarification of lube oil and printing ink?
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is
The specific cake resistance for compressible sludges is a function of the pressure drop
The specific cake resistance for compressible sludges is a function of the pressure drop
A compressible cake has the
A compressible cake has the
In froth floatation, chemical agent added to cause air adherence is called
In froth floatation, chemical agent added to cause air adherence is called
Fluid energy mill comes in the category of
Fluid energy mill comes in the category of
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
__________ is a cohesive solid.
__________ is a cohesive solid.
A cottrel precipitator makes use of the __________ for dusty air cleaning.
A cottrel precipitator makes use of the __________ for dusty air cleaning.
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.
__________ mill is not a revolving mill.
__________ mill is not a revolving mill.
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
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'?
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'?
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the
Screen capacity is not a function of
Screen capacity is not a function of
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?
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?
Trommels employ __________ for screening of materials.
Trommels employ __________ for screening of materials.
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?
Wet grinding in a revolving mill __________ as compared to dry grinding.
Wet grinding in a revolving mill __________ as compared to dry grinding.
Vertical transportation of materials can be done by a/an
Vertical transportation of materials can be done by a/an
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
increasing the capacity of a screen __________ the screen effectiveness.
increasing the capacity of a screen __________ the screen effectiveness.
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)
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)
Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
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)
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)
Pine oil and cresylic acid are used as __________ in the froth floatation process.
Pine oil and cresylic acid are used as __________ in the froth floatation process.
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the
Grinding characteristic of a material is given by its
Grinding characteristic of a material is given by its
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
A pebble mill
A pebble mill
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).
The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
Which of the following is not categorised as a "mechanical operation"?
Which of the following is not categorised as a "mechanical operation"?
Shape factor for a cylinder whose length equals its diameter is
Shape factor for a cylinder whose length equals its diameter is
Which of the following is not a revolving/tumbling mill used for size reduction?
Which of the following is not a revolving/tumbling mill used for size reduction?
The inlet pressure in a constant rate filtration
The inlet pressure in a constant rate filtration
Which of the following oxides is not present in hematite iron ore?
Which of the following oxides is not present in hematite iron ore?
Screen capacity is expressed in terms of
Screen capacity is expressed in terms of
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.
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 mesh screen means 200 openings per
200 mesh screen means 200 openings per
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
Cartridge filters are termed as 'edge' filters, because of the fact that the
Cartridge filters are termed as 'edge' filters, because of the fact that the
Mixing mechanism employed in a pan mixer is by
Mixing mechanism employed in a pan mixer is by
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
A filter press is
A filter press is
Size measurement of ultrafine particles can be best expressed in terms of
Size measurement of ultrafine particles can be best expressed in terms of
Equivalent diameter of a particle is the diameter of the sphere having the same
Equivalent diameter of a particle is the diameter of the sphere having the same
In constant pressure filtration,
In constant pressure filtration,
__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
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.
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.
Filtration rate does not depend upon the
Filtration rate does not depend upon the
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is
In case of a hammer crusher, the final product size depends on the
In case of a hammer crusher, the final product size depends on the
A propeller agitator
A propeller agitator
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)
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)
A fluid energy mill is used for
A fluid energy mill is used for
Sauter mean diameter is the same as the __________ mean diameter.
Sauter mean diameter is the same as the __________ mean diameter.
Traces of solids are removed from, liquid in a
Traces of solids are removed from, liquid in a
Sedimentation on commercial scale occurs in
Sedimentation on commercial scale occurs in
The operating speed of a ball mill should be __________ the critical speed.
The operating speed of a ball mill should be __________ the critical speed.
__________ mills are termed as disintegrators.
__________ mills are termed as disintegrators.
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
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
Gizzlies are used for separating __________ solids.
Gizzlies are used for separating __________ solids.
Percentage of drum submerged in the slurry in case of rotary drum filter is
Percentage of drum submerged in the slurry in case of rotary drum filter is
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
Energy consumed for crushing one ton of material ranges from __________ kWh.
Energy consumed for crushing one ton of material ranges from __________ kWh.
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
Supporting legs of a plate and frame filter is normally made of
Supporting legs of a plate and frame filter is normally made of
Size reduction does not occur due to compression in case of
Size reduction does not occur due to compression in case of
Filter medium resistance is important during the __________ of filtration.
Filter medium resistance is important during the __________ of filtration.
In case of a hammer crusher, the
In case of a hammer crusher, the
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.
The critical speed of a trommel (N) is related to its dia (D) as
The critical speed of a trommel (N) is related to its dia (D) as
In a roll crusher, both the rolls
In a roll crusher, both the rolls
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?
The process opposite to 'dispersion' is termed as the
The process opposite to 'dispersion' is termed as the
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)
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)
