Q.1
Bucket elevators are not suitable for the vertical lifting of __________ materials.
Q.2
Grinding efficiency of a ball mill is of the order of __________ percent.
Q.3
In filtration, the use of 'filter aid' helps in
Q.4
Fick's law relates to
Q.5
Which of the following screens has the maximum capacity?
Q.6
Solid particles of different densities are separated by
Q.7
The most suitable equipment for the transportation of 200 mesh size particles is a
Q.8
Ore concentration by jigging is based on the difference in the __________ of the particles.
Q.9
With increase in the capacity of screens, the screen effectiveness
Q.10
Crushing efficiency is the ratio of the
Q.11
For separation of sugar solution from settled out mud, we use a __________ filter.
Q.12
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
Q.13
In screen analysis, the notation +5 mm/-10 mm means particles passing through
Q.14
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
Q.15
For the transportation of ultrafine particles, the equipment used is a........conveyor.
Q.16
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
Q.17
Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
Q.18
Which of the following is a fine crusher?
Q.19
The grinding in a hammer crusher takes place due to the
Q.20
Reduction ratio of crushers is the
Q.21
A tube mill compared to a ball mill
Q.22
__________ are mixed using ribbon blenders.
Q.23
Mixing of plastic solids is generally facilitated by
Q.24
Temperature of the product during ultrafine grinding
Q.25
Dust laden air can be purified using a
Q.26
Energy consumption in a crusher decreases with increase in the
Q.27
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
Q.28
Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
Q.29
Pick out the correct statement.
Q.30
Additives used for promoting the floccula-tion of particles is a/an
Q.31
Separation of solid particles based on their densities is called
Q.32
For benefication of iron ore, the most commonly used method is
Q.33
For sizing of fine materials, the most suitable equipment is a
Q.34
During the washing of cake
Q.35
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an
Q.36
Ribbon blenders are exclusively meant for
Q.37
Diatomaceous earth is a/an
Q.38
The sphericity of a solid particle of cubical shape is
Q.39
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
Q.40
Which of the following is not an industrial screening equipment?
Q.41

Gelatinous solid (which plug the septum) can be filtered by a __________ filter.

  • sparkler
  • plate and frame
  • vacuum leaf
  • precoat
Q.42

Soft & non-abrasive materials can be made into fines by

  • attrition
  • compression
  • cutting
  • none of these
Q.43

__________ conveyors are also called scrapers.

  • Apron
  • Screw
  • Helical flight
  • both (b) & (c)
Q.44

Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)

  • S
  • 1/R
  • 1/μ
  • all (a), (b) & (c)
Q.45

In a size reduction crushing operation, the feed size istomm, while the product size is 2 tomm. This is a case of __________ crushing.

  • primary
  • secondary
  • fine
  • ultrafine
Q.46

In a roll crusher, both the rolls

  • have the same diameter.
  • are rotated towards each other.
  • run either at the same or different speeds.
  • all (a), (b) and (c).
Q.47

Which of the following is the softest material ?

  • Talc
  • Feldspar
  • Corundum
  • Calcite
Q.48

Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the

  • coagulation
  • flocculation
  • sedimentation
  • clarification
Q.49

Pick out the wrong statement.

  • For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant.
  • Cake resistance is independent of the pressure drop.
  • Crushing of explosive materials are done by employing drygrinding.
  • Gyratory crusher is a coarse crusher.
Q.50

For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?

  • Kozney-Karman equation
  • Leva's equation
  • Blake-Plummer equation
  • none of these
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