Online Chemical Engineering Test - Mechanical Operations Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following is the most suitable for handling fibrous and dense slurries ?

Propeller agitator

Cone type agitator

Turbine agitator

Radial propeller agitator

[#]

Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, V_p = volume of one particle, ρ= density of particles)

m/ρ . V_p

m . ρ/V_p

m . V_p/ρ

V_p/m . ρ

[#]

Cement clinker is reduced to fine size by a

roll crusher

ball mill

tube mill

hammer mill

[#]

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

piping

cake

filter medium

none of these

[#]

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

Toothed roll crusher

Gyratory crusher

Ball mill

Tube mill

[#]

Mixing of light fine powder such as insecticides is done by

banbery mixer

pug mill

impact wheels

kneader

[#]

__________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.

Bucket

Belt

Screw

Apron

[#]

Tank filter (e.g., Nutsch filter) is

a high pressure filter.

a continuous filter.

used for small scale filtration work.

a leaf filter.

[#]

Grinding efficiency of a ball mill is of the order of __________ percent.

1-5

40-50

75-80

90-95

[#]

10.

Solid particles of different densities are separated by

filters

thickness

cyclones

sorting classifier

[#]

11.

Filtration capacity of a rotary drum vacuum filter depends upon the

cake thickness.

characteristics of the feed slurry.

both (a) & (b).

neither (a) nor (b).

[#]

12.

Ribbon blenders are exclusively meant for

blending miscible liquids.

non-flowing powder and thin pastes.

bath mixing.

continuous mixing.

[#]

13.

Traces of liquid tar fog present in coke oven gas is separated using

electrostatic precipitator

cyclone separator

strainer

none of these

[#]

14.

Weber number is significant and is concerned with the

solid-liquid mixing.

liquid-liquid mixing.

dispersion of liquid in liquid.

suspension of solid in liquid.

[#]

15.

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

disks have very sharp edge.

solids are not deposited at the edge of the disk.

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

none of these.

[#]

16.

Helical screw agitator is used for

mixing highly viscous pastes.

blending immiscible liquids.

mixing liquids at very high temperature (> 250 °C).

none of these.

[#]

17.

Velocity of a small particle of diameter 'D_p' at a distance 'r' from the rotational axis of a cyclone rotating at an angular speed 'ω' is given by (the other symbols are as per standard notation)

[#]

18.

Carbon black is pulverised in a

hammer crusher

ball mill

roll crusher

gyratory crusher

[#]

19.

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

Tubular bowl

Disc-bowl

Perforated horizontal basket continuous

Suspended batch basket

[#]

20.

Use of grinding aids results in the

enhanced production rate.

finer products.

both (a) & (b).

neither (a) nor (b).

[#]

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Online Chemical Engineering Test - Mechanical Operations Test

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