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Parti > S7 > Flashcards

S7 Flashcards

1
Q

To get ultrafine particles, the equipment used is a

A

fluid energy mill

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1
Q

Vacuum filter is most suitable for the

A

none of these.

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2
Q

The porosity of a compressible cake is

A

minimum at the filter medium.

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3
Q

Which of the following conveyors cannot be recommended for transportation of abrasive materials?

A

Flight conveyor

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4
Q

Separation of materials into products based on the difference of their sizes is called

A

sizing

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5
Q

For classification of potable (drinking) water, we use a __________ filter.

A

gravity sand

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6
Q

Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

A

apron

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7
Q

In case of grinding in a ball mill

A

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

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8
Q

The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area, m2V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m3)

A

3.6 AVS.ρ

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9
Q

Kick’s law relates to

A

energy consumption

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10
Q

__________ mill is normally used for grinding of talc.

A

Ring-roll

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11
Q

Colloidal mills are used for __________ grinding.

A

ultrafine

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12
Q

The maximum slope of a belt conveyor can be

A

30°

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13
Q

The filter medium resistance is controlled by

A

both pressure drop and flow rate

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14
Q

The unit of filter medium resistance is

A

cm^-1

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15
Q

During size reduction by a jaw crusher, the energy consumed decreases with the

A

increasing size of feed at constant reduction ratio.

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16
Q

Which of the following can be most effectively used for clarification of lube oil and printing ink?

A

Sharpies supercentrifuge

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17
Q

Ultracentrifuges running at speeds upto 100000 rpm is normally used for the

A

separation of isotopes based on their density or molecular weights difference.

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18
Q

Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.

A

classification

19
Q

The basic filtration equation is given asdt/dV = µ/A ∆P (a . CV / A + Rm) where,V is volume of the filtrate ;Ais the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, andC is the concentration of the solids in the feed slurry.

In a 20 minutes constant rate filtration, 5 m3of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3of filtrate to be produced? Neglect filter medium resistance,Rm; assume incompressible cake.

A

20

20
Q

Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the

A

cage mill

21
Q

The material is crushed in a gyratory crusher by the action of

A

compression

22
Q

The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.

A

2

23
Q

Which of the following may prove unsuitable for filtering volatile liquids?

A

Vacuum filter

24
Q

__________ mean diameter of particles is given by∑ (xi / Dpi)

A

volume

25
Q

Mass flow of granular solid (M) through a circular opening of dia,Dfollows

A

M∝D^3

26
Q

Sauter mean diameter is the same as the __________ mean diameter.

A

volume-surface

27
Q

Cake resistance is

A

none of these.

28
Q

In paint industries, blending of light paste is done by using a

A

charge can mixer

29
Q

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

0.50

30
Q

__________ is used for producing a thick suspension from a thin slurry.

A

Pressure filter thickener

31
Q

Wet seiving is employed, when the product contains __________ materials.

A

large quantity of very fine

32
Q

Energy requirement (per unit mass of material crushed/ground) is highest for

A

fluid energy mill

33
Q

The energy consumed by a ball mill depends on

A

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

34
Q

Energy consumption in a crusher decreases with increase in the

A

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

34
Q

In a mixer, the quantity, (v.L/D) is termed as __________ number(where,v= longitudinal velocity of material,L= length of the mixer,D= diffusivity in axial mixing).

A

Peclet

35
Q

The term ‘angle of nip’ is concerned with the operation of the __________ crushers.

A

roll

36
Q

Cartridge filters are termed as ‘edge’ filters, because of the fact that the

A

bulk of the solids are removed at the periphery of the disks.

37
Q

Vibrating screens have capacity in the range of __________ tons/ft^2.mm mesh size.

A

0.2 to 0.8

38
Q

Cumulative analysis for determining surface is more precise than differential analysis, because of the

A

assumption that all particles in a single fraction are equal in size, is not needed.

39
Q

To remove very small amount of tiny solid impurities from liquid, we use a

A

coagulant

40
Q

Screw conveyors are

A

suitable for sticky materials.

41
Q

__________ mills fall in the category of tumbling mills,

A

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

42
Q

Capacity of flight conveyor in tons/hr is given by (where,W&D= width and depth of flight respectively in metreV= speed of the conveyor, metre/second ρ = bulk density of material, kg/m3)

A

3.6W.D.V.ρ

43
Q

Which of the following is not a cutting machine?

A

Tube mills

44
Q

Weber number is significant and is concerned with the

A

dispersion of liquid in liquid.

45
Q

Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.

A

density

Parti (9 decks)

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