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Parti > S1 > Flashcards

S1 Flashcards

1
Q

Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a ________ conveyor.

A

screw

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2
Q

Equivalent diameter of a particle is the diameter of the sphere having the same

A

ratio of surface to volume as the actual volume.

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3
Q

If dp is the equivalent diameter of a non-spherical particle, Vpits volume and sp its surface area, then its sphericity is Φsis defined by

A

Φs = 6 Vp / dp sp

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4
Q

Power required to drive a ball mill with a particular ball load is proportional to (where,D= diameter of ball mill)

A

D^2.5

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5
Q

Pick out the wrong statement.

A

Size enlargement (opposite of size reduction) is not a mechanical operation.

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6
Q

In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

A

square root of the velocity.

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7
Q

For sizing of fine materials, the most suitable equipment is a

A

vibrating screen

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8
Q

Which of the following is not categorised as a “mechanical operation”

A

Humidification

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9
Q

Which of the following is a pressure filter?

A

Plate and flame filter.

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10
Q

Tabular bowl centrifuges as compared to disk bowl centrifuges

A

operate at higher speed.

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11
Q

Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

A

flint or porcelain

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12
Q

Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

A

all ‘a’, ‘b’ &’c’.

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13
Q

Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct?

A

μ ≥ tan α

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14
Q

Pick out the wrong statement pertaining to the roll crushers.

A

Both the rolls run necessarily at the same speed.

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15
Q

Which of the following is not an ultrafine grinder (colloid mill)?

A

Toothed roll crusher

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16
Q

Two particles are called to be equal settling, if they are having the same.

A

terminal velocities in the same fluid & in the same field of force.

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17
Q

Which of the following is the most suitable for handling fibrous and dense slurries?

A

Cone type agitator

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18
Q

__________ centrifuge is normally used in sugar mills.

A

Suspended batch basket

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19
Q

Solid particles separation based on the difference in their flow velocities through fluids is termed as the

A

classification

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20
Q

Diatomaceous earth is a/an

A

filter aid

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21
Q

The distribution given by microscopic analysis of powder is

A

number

22
Q

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)

A

m/ρ .Vp

23
Q

For a non-spherical particle, the sphericity

A

is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.

24
Q

In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

A

1/4

25
Q

Ball mills and tube mills with flint or porcelain balls are used for size reduction of

A

non-metallic ores

26
Q

Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

A

hard rubber

27
Q

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.

A

speed

28
Q

Which of the following is not a part of the Blake jaw crusher?

A

Hanger

29
Q

If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

A

centrifugation

30
Q

Filter aid is used to

A

increase the porosity of the cake.

31
Q

Which of the following mineral dressing operations is termed as ‘comminution’?

A

None of these

32
Q

The capacity of a pneumatic conveying system depends upon the

A

all (a), (b) and (c).

33
Q

Pick out the wrong statement.

A

The equipment used for the removal of traces of solids from a liquid is called a classifier.

34
Q

Gravity settling process is not involved in the working of a

A

hydrocyclone

34
Q

Froth floatation is the most suitable for treating

A

sulphide ores

35
Q

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 μm is

A

18 kWh/ton

36
Q

Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

A

Froth floatation

37
Q

Pick out the correct statement:

A

Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.

38
Q

Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

A

0.2 to 0.8

39
Q

Highly viscous liquids & pastes are agitated by

A

multiple blade paddles

40
Q

The value of ‘angle of nip’ is generally about

A

32°

41
Q

Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

A

metalliferrous ores

42
Q

Sulphuric acid mist is arrested by using a __________ scrubber.

A

venturi

43
Q

The main size reduction operation in ultrafine grinders is

A

attrition

44
Q

In case of a hammer crusher,

A

all (a), (b) and (c).

45
Q

Jigging is a technique by which different particles can be

A

separated by particle size.

46
Q

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.

A

impact

47
Q

Balls for ball mills are never made of

A

lead

48
Q

200 mesh screen means 200 openings per

A

inch

49
Q

__________ is the most commonly used ‘filter aid’.

A

Diatomaceous earth

Parti (9 decks)

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