Separation of solid particles based on their densities is called
Separation of solid particles based on their densities is called
Gold ore concentration is mostly done using
Gold ore concentration is mostly done using
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
Which of the following is a fine crusher?
Which of the following is a fine crusher?
Which of the following screens has the maximum capacity?
Which of the following screens has the maximum capacity?
Crushing efficiency is the ratio of the
Crushing efficiency is the ratio of the
Solid particles of different densities are separated by
Solid particles of different densities are separated by
Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
Basic slag is not ground in
Basic slag is not ground in
Apron conveyors are used for
Apron conveyors are used for
Helical screw agitator is used for
Helical screw agitator is used for
During filtration operation, the filtrate encounters the resistance of the
During filtration operation, the filtrate encounters the resistance of the
Energy requirement (per unit mass of material crushed/ground) is highest for
Energy requirement (per unit mass of material crushed/ground) is highest for
Additives used for promoting the floccula-tion of particles is a/an
Additives used for promoting the floccula-tion of particles is a/an
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?
According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than
According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than
Which of the following is not an industrial screening equipment?
Which of the following is not an industrial screening equipment?
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
Reduction ratio of crushers is the
Reduction ratio of crushers is the
Ball mill is used for
Ball mill is used for
Wet seiving is employed, when the product contains __________ materials.
Wet seiving is employed, when the product contains __________ materials.
Compressibility co-efficient for an absolutely compressible cake is
Compressibility co-efficient for an absolutely compressible cake is
Which of the following is not accomplished by agitation of liquids in agitators?
Which of the following is not accomplished by agitation of liquids in agitators?
Energy consumption in a crusher decreases with increase in the
Energy consumption in a crusher decreases with increase in the
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.
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.
200 mesh seive size corresponds to __________ microns.
200 mesh seive size corresponds to __________ microns.
Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.
Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.
Bucket elevators are not suitable for the vertical lifting of __________ materials.
Bucket elevators are not suitable for the vertical lifting of __________ materials.
Chance process is used for the
Chance process is used for the
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
__________ baffles are provided in ball mills.
__________ baffles are provided in ball mills.
Dust laden air can be purified using a
Dust laden air can be purified using a
__________ centrifuge is the most suitable for separation of non-friable crystals.
__________ centrifuge is the most suitable for separation of non-friable crystals.
Moore filter is a __________ filter.
Moore filter is a __________ filter.
Filter aid is used to
Filter aid is used to
Which of the following is a batch sedimentation equipment?
Which of the following is a batch sedimentation equipment?
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an
For sizing of fine materials, the most suitable equipment is a
For sizing of fine materials, the most suitable equipment is a
Bond crushing law
Bond crushing law
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
Float and sink test determines the possibility of cleaning of coal by a process based on the
Float and sink test determines the possibility of cleaning of coal by a process based on the
In case of grinding in a ball mill
In case of grinding in a ball mill
For the transportation of ultrafine particles, the equipment used is a........conveyor.
For the transportation of ultrafine particles, the equipment used is a........conveyor.
The most suitable equipment for the transportation of 200 mesh size particles is a
The most suitable equipment for the transportation of 200 mesh size particles is a
Diatomaceous earth is a/an
Diatomaceous earth is a/an
Ore concentration by jigging is based on the difference in the __________ of the particles.
Ore concentration by jigging is based on the difference in the __________ of the particles.
Ribbon blenders are exclusively meant for
Ribbon blenders are exclusively meant for
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
As particle size is reduced
As particle size is reduced
Which of the following is a coarse crusher?
Which of the following is a coarse crusher?
The main size reduction operation in ultrafine grinders is
The main size reduction operation in ultrafine grinders is
Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).
Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).
During the washing of cake
During the washing of cake
Separation of materials of the same density based on their sizes by using then-different rates of flow is called
Separation of materials of the same density based on their sizes by using then-different rates of flow is called
Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
Out of the following size reduction equipments, the maximum feed size can be accepted by the
Out of the following size reduction equipments, the maximum feed size can be accepted by the
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
Use of grinding aids results in the
Use of grinding aids results in the
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 ?
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 ?
Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
Optimum ratio of operating speed to critical speed of a trommel is
Optimum ratio of operating speed to critical speed of a trommel is
For separation of sugar solution from settled out mud, we use a __________ filter.
For separation of sugar solution from settled out mud, we use a __________ filter.
Length/diameter ratio of a ball mill is
Length/diameter ratio of a ball mill is
Trommels separate a mixture of particles depending on their
Trommels separate a mixture of particles depending on their
Pick out the correct statement:
Pick out the correct statement:
Ball mills and tube mills with flint or porcelain balls are used for size reduction of
Ball mills and tube mills with flint or porcelain balls are used for size reduction of
Cake resistance is
Cake resistance is
The sphericity of a solid particle of cubical shape is
The sphericity of a solid particle of cubical shape is
Shell and leaf filter as compared to plate and frame filter
Shell and leaf filter as compared to plate and frame filter
A tube mill compared to a ball mill
A tube mill compared to a ball mill
For benefication of iron ore, the most commonly used method is
For benefication of iron ore, the most commonly used method is
Pine oil used in froth floatation technique acts as a/an
Pine oil used in froth floatation technique acts as a/an
Which of the following is a vacuum filter?
Which of the following is a vacuum filter?
__________ are mixed using ribbon blenders.
__________ are mixed using ribbon blenders.
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
Size reduction of asbestos and mica is done by
Size reduction of asbestos and mica is done by
Fick's law relates to
Fick's law relates to
Temperature of the product during ultrafine grinding
Temperature of the product during ultrafine grinding
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.
Crushing efficiency of a machine ranges between __________ percent.
Crushing efficiency of a machine ranges between __________ percent.
Mixing of plastic solids is generally facilitated by
Mixing of plastic solids is generally facilitated by
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
Grindability of a material does not depend upon its
Grindability of a material does not depend upon its
The grinding in a hammer crusher takes place due to the
The grinding in a hammer crusher takes place due to the
Which of the following clay mixing devices is vacuum operated for deairation of clay?
Which of the following clay mixing devices is vacuum operated for deairation of clay?
The material is crushed in a gyratory crusher by the action of
The material is crushed in a gyratory crusher by the action of
Weber number is significant and is concerned with the
Weber number is significant and is concerned with the
Carbon black is pulverised in a
Carbon black is pulverised in a
In screen analysis, the notation +5 mm/-10 mm means particles passing through
In screen analysis, the notation +5 mm/-10 mm means particles passing through
Pick out the correct statement.
Pick out the correct statement.
Handling of ashes and similar materials can be done best by a __________ conveyor.
Handling of ashes and similar materials can be done best by a __________ conveyor.
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
Grinding efficiency of a ball mill is of the order of __________ percent.
Grinding efficiency of a ball mill is of the order of __________ percent.
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
Pick out the correct statement.
Pick out the correct statement.
In filtration, the use of 'filter aid' helps in
In filtration, the use of 'filter aid' helps in
With increase in the capacity of screens, the screen effectiveness
With increase in the capacity of screens, the screen effectiveness
