Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Parti > S9 > Flashcards

S9 Flashcards

1
Q

Sphericity of raschig ring (whose length and diameter are equal) is

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Chance process is used for the

A

cleaning of coal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Mixing mechanism employed in a pan mixer is by

A

mulling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which of the following screens has the maximum capacity?

A

Vibrating screen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Stamp mills are generally used for crushing

A

gold ores

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.

A

laminar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which of the following is a batch sedimentation equipment?

A

Filter thickener

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The most suitable equipment for the transportation of 200 mesh size particles is a

A

pneumatic conveyor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which of the following is not used as filter aid?

A

Rice husk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Raw materials are charged in the iron blast furnace using

A

skip hoist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Carbon black is pulverised in a

A

ball mill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

A

electro-static precipitator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The filtrate flow rate in constant pressure filtration

A

continuously decreases.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Theoretical capacity of crushing rolls in tons/hr is given by (where,V= peripherial velocity, m/sec.W= width of rolls, mDr= distance between rolls ρ = density of material to be crushed, kg/m3here,V= πN.Dwhere,N= speed of the rolls in rotation per second (rps)D= diameter of rolls, m)

A

3.6V.W.Dr.ρ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of

A

either (a), (b) or (c).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The inlet pressure in a constant rate filtration

A

increases continuously

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.

A

< 74

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

__________ centrifuge is the most suitable for separation of non-friable crystals.

A

Perforated horizontal basket continuous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

For benefication of iron ore, the most commonly used method is

A

jigging & tabling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

A propeller agitator

A

produces mainly axial flow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

A

neither (a) nor (b)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Screen capacity is proportional to (where,S= screen aperture)

A

S

22
Q

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.

A

middling

23
Q

Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

A

Dry grinding of large particles in un-baffed mills.

24
Q

A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

A

strainer

25
Q

Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called

A

sedimentation

26
Q

Reciprocal of sphericity is termed as the

A

shape factor

27
Q

With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

A

increases

28
Q

Pick out the wrong statement.

A

200 mesh screen has 200 openings per linear cm.

29
Q

Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.

A

toothed roll

30
Q

A filter press is

A

a batch filter.

31
Q

Xanthates are used in the froth floatation process as a/an

A

collector

32
Q

The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

A

sqrt 2

33
Q

The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

A

6 . V / D . S

34
Q

Limestone is normally crushed in a

A

hammer crusher

35
Q

Filtrate flow rate in case of a rotary drum vacuum filter (in whichRm< <Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosityRm= filter medium resistanceRc= cake resistance).

A

1/ sqrt μ

36
Q

The main differentiation factor between tube mill and ball mill is the

A

length to diameter ratio.

37
Q

Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.

A

ribbed

38
Q

Use of grinding aids results in the

A

neither (a) nor (b).

39
Q

A belt conveyor used for the transportation of materials can

A

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

40
Q

Which of the following is not used as a surface active agent in a flocculation operation?

A

Quartz

41
Q

__________ mill is not a revolving mill.

A

Cage

42
Q

For the transportation of ultrafine particles, the equipment used is a……..conveyor.

A

pneumatic

43
Q

During filtration operation, the filtrate encounters the resistance of the

A

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

44
Q

Filtration rate does not depend upon the

A

none of these.

45
Q

Which of the following is a fine crusher?

A

Toothed roll crusher

46
Q

__________ is a cohesive solid.

A

Wet clay

47
Q

The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

A

3 to 4

48
Q

The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

A

2.5 times

49
Q

Dispersion of a gas through liquid is done by using a

A

sparger

50
Q

Work index is defined as the

A

gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.

51
Q

Removal of activated carbon from glycerine is done by

A

plate and frame filter

52
Q

What is the reduction ratio in a fine crushing operation having following feed and product sizes?

Parameter Unit Maximum Minimum
Feed Size mm 20 10
Product Size mm 10 5

A

2

Parti (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions