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Parti > S2 > Flashcards

S2 Flashcards

1
Q

Energy consumed for crushing one ton of material ranges from __________ kWh.

A

0.5 to 1.5

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2
Q

For transporting pasty material, one will use a/an

A

screw colaveyor

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3
Q

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

A

disc bowl centrifuge.

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4
Q

A tube mill compared to a ball mill

A

has a higher length/diameter ratio.

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5
Q

Trommels separate a mixture of particles depending on their

A

size

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6
Q

Basic slag is not ground in

A

jaw crushers

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7
Q

Grindability of a material does not depend upon its

A

size

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8
Q

Shape factor for a cylinder whose length equals its diameter is

A

1.5

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9
Q

In case of a hammer crusher, the

A

rotor shaft carrying hammers can be vertical or horizontal.

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10
Q

Dust laden air can be purified using a

A

cyclone separator

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11
Q

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

A

easier grindability

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12
Q

Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where,L= length of the receiving opening, cmS= greater width of the discharge opening, cm)

A

0.087L.S

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13
Q

Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

A

all (a), (b) & (c)

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14
Q

General crushing equation is given by d(rho/m) = - K d Ds / Dns. Bond’s crushing law isobtained by solving this equation for n = __________ and feed of infinite size.

A

1.5

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15
Q

Which of the follwoing mechanical conveyors does not come under the division ‘scrapers’?

A

Bucket elevators

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16
Q

__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.

A

Banbery

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17
Q

Which of the following mechanical conveyors does not come under the division ‘carriers’?

A

Screw conveyor

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18
Q

Screen capacity is not a function of

A

atmospheric humidity.

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19
Q

Which of the following is a vacuum filter?

A

Rotary disc filter

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20
Q

Pine oil used in froth floatation technique acts as a/an

A

frother

21
Q

Length/diameter ratio of a ball mill is

A

< 1

22
Q

Feed size of ≥ 25 cms can be accepted by

A

jaw crusher

23
Q

Which is the most suitable conveyor for transportation of sticky material?

A

Screw conveyor

24
Q

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an

A

electrostatic precipitator

25
Q

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

A

<10

26
Q

Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

A

1

27
Q

Filtration of water in a paper mill is done by a/an __________ filter.

A

open sand

27
Q

Moore filter is a __________ filter.

A

leaf

28
Q

Ball mill is used for

A

fine grinding

29
Q

In case of a ball mill,

A

coarse feed requires a larger ball.

30
Q

Maximum size reduction in a ball mill is done by the, __________ action.

A

impact

31
Q

increasing the capacity of a screen __________ the screen effectiveness.

A

decreases.

32
Q

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

A

N2

33
Q

Bond crushing law

A

calls for relatively less energy for the smaller product particles, than does the Rittinger law.

34
Q

Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.

A

Kozney-Karman

35
Q

The controlling resistance in a rotary drum vacuum filter is the __________ resistance.

A

cake

36
Q

Which of the following is used for primary crushing of very hard lumpy materials?

A

Gyratory crusher

37
Q

Coal is finally pulverised to 200 mesh size for burning in boilers by a

A

ball mill

38
Q

Crushing efficiency is the ratio of the

A

surface energy created by crushing to the energy absorbed by the solid.

39
Q

The resistance offered by the filter used in a bag filter is proportional to (where,c= dust concentration, ands= particle size)

A

c/s

40
Q

Cement clinker is reduced to fine size by a

A

tube mill

41
Q

The crushed material received for separation is called feed or

A

heading

42
Q

For spheres, volume shape factor is given by

A

π/6(=V/D3)

43
Q

Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?

A

Helical screw

44
Q

__________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.

A

Selectivity index

45
Q

The operating speed of a ball mill should be __________ the critical speed.

A

less than

46
Q

__________ are used for the separation of coarse particles from a slurry of fine particles.

A

Classifiers

47
Q

Fibrous material is broken by a

A

squirrel-cage disintegrator

48
Q

__________ is the most suitable for compounding rubber and plastic solids.

A

Banbery mixer

Parti (9 decks)

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