The maximum slope of a belt conveyor can be
The maximum slope of a belt conveyor can be
Rod mills employed for grinding
Rod mills employed for grinding
In case of a ball mill,
In case of a ball mill,
Vacuum filter is most suitable for the
Vacuum filter is most suitable for the
Which of the following achieves the least reduction ratio for a given feed size?
Which of the following achieves the least reduction ratio for a given feed size?
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
The value of 'angle of nip' is generally about
The value of 'angle of nip' is generally about
Solid particles separation based on the difference in their flow velocities through fluids is termed as the
Solid particles separation based on the difference in their flow velocities through fluids is termed as the
Sphericity of pulverised coal is
Sphericity of pulverised coal is
Traces of liquid tar fog present in coke oven gas is separated using
Traces of liquid tar fog present in coke oven gas is separated using
Which of the following is not used as filter aid?
Which of the following is not used as filter aid?
During size reduction by a jaw crusher, the energy consumed decreases with the
During size reduction by a jaw crusher, the energy consumed decreases with the
__________ is the most suitable for compounding rubber and plastic solids.
__________ is the most suitable for compounding rubber and plastic solids.
Mesh indicates the number of holes per
Mesh indicates the number of holes per
For efficient grinding, ball mills must be operated
For efficient grinding, ball mills must be operated
Which of the following must be stored in silos and not in open yard?
Which of the following must be stored in silos and not in open yard?
What is the selectivity index, if the grade of tailings & concentrate is the same?
What is the selectivity index, if the grade of tailings & concentrate is the same?
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.
A gravity decanter is meant for the separation of two __________ density.
A gravity decanter is meant for the separation of two __________ density.
The reduction ratio for fine grinders is
The reduction ratio for fine grinders is
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
In paint industries, blending of light paste is done by using a
In paint industries, blending of light paste is done by using a
Jigging is a technique by which different particles can be
Jigging is a technique by which different particles can be
The sphericity of a cylinder of 1 mm diameter and length 3 mm is
The sphericity of a cylinder of 1 mm diameter and length 3 mm is
Feed size of ≥ 25 cms can be accepted by
Feed size of ≥ 25 cms can be accepted by
Choke crushing (in case of a Jaw crusher) compared to free crushing
Choke crushing (in case of a Jaw crusher) compared to free crushing
Which of the following mineral dressing operations is termed as 'comminution'?
Which of the following mineral dressing operations is termed as 'comminution'?
Pick out the wrong statement pertaining to the turbine agitator.
Pick out the wrong statement pertaining to the turbine agitator.
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
A tube mill as compared to a ball mill
A tube mill as compared to a ball mill
Rittinger's crushing law states that
Rittinger's crushing law states that
Trommels are revolving screens which normally operate in the range of __________ rpm.
Trommels are revolving screens which normally operate in the range of __________ rpm.
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
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.
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.
The filtrate flow rate in constant pressure filtration
The filtrate flow rate in constant pressure filtration
Filter medium resistance is that offered by the
Filter medium resistance is that offered by the
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
Screen capacity is proportional to (where, S = screen aperture)
Screen capacity is proportional to (where, S = screen aperture)
Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
Tank filter (e.g., Nutsch filter) is
Tank filter (e.g., Nutsch filter) is
__________ mills are termed as impactors.
__________ mills are termed as impactors.
Pick out the correct statement.
Pick out the correct statement.
To get ultrafine particles, the equipment used is a
To get ultrafine particles, the equipment used is a
During agitation of liquids, power consumption during laminar flow is not proportional to the
During agitation of liquids, power consumption during laminar flow is not proportional to the
Use of baffles in agitators help in minimising the __________ tendency.
Use of baffles in agitators help in minimising the __________ tendency.
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)
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)
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?
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
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
Pick out the material having minimum Rittinger's number.
Pick out the material having minimum Rittinger's number.
Separation of isotopes is generally done using a/an __________ centrifuge.
Separation of isotopes is generally done using a/an __________ centrifuge.
Colloid mills achieve size reduction mainly by
Colloid mills achieve size reduction mainly by
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
Toothed roll crushers achieve size reduction by
Toothed roll crushers achieve size reduction by
Which of the following mechanical conveyors does not come under the division 'carriers'?
Which of the following mechanical conveyors does not come under the division 'carriers'?
Wheat is ground into flour in a
Wheat is ground into flour in a
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
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
In bag filters, filter fabrics are never made of
In bag filters, filter fabrics are never made of
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
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
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
Close circuit grinding by a ball mill with air sweeping employs a
Close circuit grinding by a ball mill with air sweeping employs a
Width and speed of a conveyor belt depends upon the __________ of the material.
Width and speed of a conveyor belt depends upon the __________ of the material.
Which of the following is a continuous filter?
Which of the following is a continuous filter?
Cumulative analysis for determining surface is more precise than differential analysis, because of the
Cumulative analysis for determining surface is more precise than differential analysis, because of the
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
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.
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.
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.
Which of the following is a pressure filter?
Which of the following is a pressure filter?
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.
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.
Addition of filter aid to the slurry before filtration is done to ...... of the cake.
Addition of filter aid to the slurry before filtration is done to ...... of the cake.
In bag filters, filter fabrics are never made of
In bag filters, filter fabrics are never made of
Soft & non-abrasive materials can be made into fines by
Soft & non-abrasive materials can be made into fines by
Raw materials are charged in the iron blast furnace using
Raw materials are charged in the iron blast furnace using
Fibrous material is broken by a
Fibrous material is broken by a
Size reduction mechanism used in Jaw crushers is
Size reduction mechanism used in Jaw crushers is
Which of the following is not used as a filter medium in case of corrosive liquids?
Which of the following is not used as a filter medium in case of corrosive liquids?
Which of the following comes in the category of primary crusher for hard and tough stone?
Which of the following comes in the category of primary crusher for hard and tough stone?
Which of the following is the most suitable for handling fibrous and dense slurries?
Which of the following is the most suitable for handling fibrous and dense slurries?
In case of a revolving mill, wet grinding compared to dry grinding
In case of a revolving mill, wet grinding compared to dry grinding
__________ mill is normally used for grinding of talc.
__________ mill is normally used for grinding of talc.
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).
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).
The opening of a 200 mesh screen (Taylor series) is
The opening of a 200 mesh screen (Taylor series) is
Ultra centrifuges are used for the separation of __________ solid particles.
Ultra centrifuges are used for the separation of __________ solid particles.
__________ mills fall in the category of tumbling mills,
__________ mills fall in the category of tumbling mills,
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.
General mechanism of size reduction in intermediate and fine grinder is by
General mechanism of size reduction in intermediate and fine grinder is by
The unit of filter medium resistance is
The unit of filter medium resistance is
Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?
Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?
Which is a secondary crusher for a hard & tough stone?
Which is a secondary crusher for a hard & tough stone?
Sphericity of raschig ring (whose length and diameter are equal) is
Sphericity of raschig ring (whose length and diameter are equal) is
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)
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.
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.
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
In case of a hammer crusher,
In case of a hammer crusher,
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are
