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ChE LE Flashcards > Partech > Flashcards

Partech Flashcards

1
Q

Increasing the capacity of screen causes ____

A

decreases the screen effectiveness

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2
Q

Equation for Screen efficiency is

A

recovery x rejection

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3
Q

The material passing one screening surface and retained on a subsequent surface is called

A

intermediate material

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4
Q

Size measurement of ultrafine particles can be best expressed in terms of

A

surface area/ unit mass

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5
Q

The hardness of a mineral is a criterion of its resistance to crushing.
Which of the following is an example of a hard material?

A

sapphire

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6
Q

Mesh indicates the number of holes per

A

Linear inch

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7
Q

Describe:
Tyler Standard Sieve Series
US Standard Sieve Series
International Test Sieve Series

A

Tyler Standard Sieve Series: consecutive mesh have sqrt(2) ratio
US Standard Sieve Series: consecutive mesh have fourth root of 2 ratio
International Test Sieve Series: similar to both, but have different wire gauges

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8
Q

The standard equipment recommended for automatically carrying out sieve test procedures with accuracy and dependability.

A

Ro tap shaker (read Screening)

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9
Q

A major expense in crushing and grinding of feed material

A

Cost of power

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10
Q

For the preliminary breaking of hard rock, we use a ____

A

Gyratory crusher

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11
Q

Size reduction mechanism used in jaw crushers is ____

A

Compression

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12
Q

The main size reduction operation in ultrafine grinders is

A

Attrition

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13
Q

Explain Taggart’s Rule

A

T= 0.6 * L * S
T: short ton/hr
L: length feed opening, in
S: greatest with of opening, in

if T/S^2 > 0.155: Use Gyratory crusher
if T/S^2 < 0.155: Use Jaw crusher

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14
Q

Size Reduction Mechanism:
Coarse
Fine
Ultrafine

A

Coarse: Compression
Fine: Impact
Ultrafine: Attrition

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15
Q

As the product becomes finer, the energy required for grinding

A

increases

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16
Q

To get a fine talc powder from its granules, the equipment used is

A

Ball mill

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17
Q

Maximum size reduction in a ball mill is done by ______

A

Impact

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18
Q

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

A

Less than

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19
Q

The operation by which solids are separated from liquids due to difference in the respective densities is ______

A

sedimentation

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20
Q

Forces acting on a particle settling in fluid are ___ (multiple answers)

A

gravitational or centrifugal, buoyant and drag forces

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21
Q

Drag is defined as the force exerted by the ____

A

fluid on the solid in a direction opposite to flow

22
Q

Stoke’s law is valid when the particle Reynolds number is _____

A

Re,p <1

23
Q

In hindered settling, the particles are
A. Placed farther from the wall
B. Not affected by other particles and the wall
C. Near each other
D. None of these

A

Near each other

24
Q

Drag co-efficient in hindered settling is __________ that in free settling.
A. Less than
B. Equal to
C. Not necessarily greater than
D. Always greater than

A

Always greater than

25
Q

Filter aid is used to ____
A. Increase the rate of filtration
B. Decrease the pressure drop
C. Increase the porosity of the cake
D. Act as a support base for the septum

A

Increase the porosity of the cake

26
Q

During the washing of cake ____
A. All the resistances are constant
B. Filter medium resistance increases
C. Filter medium resistance decreases
D. Cake resistance decreases

A

All the resistances are constant

27
Q

The porosity of a compressible cake is _____
a. minimum at the filter medium
b. minimum at the upstream face
c. maximum at the filter medium
d. same throughout the thickness

A

Minimum at the filter medium

28
Q

The terminal velocity of a small sphere settling in a viscous fluid varies as the ______
a. first power of its diameter
b. inverse of the fluid viscosity
c. inverse square of the diameter
d. square of the difference in specific weights of solid and fluid

A

Inverse of the fluid viscosity

29
Q

Buoyant force _____
a. for non-symmetrical bodies is not vertical
b. depends on the depth of the submergence of the floating body
c. depends on the weight of the floating body
d. none of these

A

Depends on the weight of the floating body

30
Q

Terminal velocity is ______
a. constant velocity with no acceleration
b. a fluctuating velocity
c. attained after moving one-half of total distance
d. none of these

A

A constant velocity with no acceleration

31
Q

Which of the following may prove unsuitable for filtering volatile liquids?
a. pressure filter
b. centrifugal filter
c. gravity filter
d. vacuum filter

A

Vacuum filter

32
Q

In washing type plate and frame filter press the ratio of washing rate to the final filtrate rate is ____
a. 4
b. 1
c. ¼
d. ½

A

¼

33
Q

Moore filter is a __________ .
A. Leaf filter
B. Press filter
C. Rotary filter
D. Sand filter

A

Leaf filter

34
Q

Diatomaceous earth is a/an ______
A. Explosive
B. Filter aid
C. Filter medium
D. Catalyst

A

Filter aid

35
Q

Particle diameter in size 50% passes through equipment (undersize) and 50% discharged through equipment (oversize)

A

Cutpoint Diameter
Critical Diameter

36
Q

If the radius of a basket centrifuge is halved and the rpm is doubled, then _____
a. linear speed of the basket is doubled
b. linear speed of the basket is halved
c. centrifugal force is doubled
d. capacity of centrifuge is increased

A

Centrifugal force is doubled

37
Q

For separation of sugar solution from settled out mud we use _____

A

Centrifugal filter

38
Q

Which is the driving force behind free falling body?

A

gravitational force

39
Q

A flotation modifier which assists in selectivity (sharpness of separation) or stop unwanted minerals from floating is a/an _____

A

depressants

40
Q

Froth floatation is the most suitable for treating ____

A

Sulphide ores

41
Q

In Froth Flotation, chemical agent added to cause air adherence is called ____

A

collector

42
Q

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

A

Frother

43
Q

It is the separation of fluid-solid mixture involving the passage of most of the fluid through a porous membrane which returns most of the solid particles contained in the mixture

A

filtration

44
Q

Which of the following types of filter are made to operate to continuously?
a. rotary drum
b. gravity
c. filter press
d. leaf filter

A

rotary drum

45
Q

A major expense in crushing and grinding of feed material

A
46
Q

Moh’s Scale if Hardness

A

Trading Game Coming
FAF
QTCD
*Soft:
1.Talc
2.Gypsum
3.Calcite
*Intermediate:
4.Fluorite
5.Apatite
6.Feldspar
*Hard
7.Quartz
8.Topaz
9.Corundum
10.Diamond

47
Q

Stages of Size Reduction Equipment

A

*Coarse
Gyratory Crusher
Jaw Crusher
Hammer Mill

*Intermediate
Cone crusher
Crushing rolls

*Fine
Ball Mills
Rod Mills

48
Q

Parallel metal bars in an inclined stationary frame

A

Grizzly Screens

49
Q

Screen frequency controlled by electromagnetic vibrator mounter above and directly to screening surface

A

Vibrating screen

50
Q

Composes of rotating perforated drum separating particles from smallest to biggest

A

Reciprocating Screens

ChE LE Flashcards (20 decks)

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