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Unit 4.3 – Comminution and Mixing Equipment

Total questions: 42

Worksheet time: 21mins

Name
Class
Date
1.

Crushing is the first step in:

a)

Heat transfer

b)

Size reduction

c)

Distillation

d)

Liquid mixing

2.

Grinding is used when the process requires:

a)

Larger lumps

b)

Fine-sized powders

c)

Increased viscosity

d)

Dehydration

3.

Crushing design is considered primarily:

a)

Theoretical

b)

Empirical

c)

Chemical

d)

Magnetic

4.

Equipment selection for comminution relies heavily on:

a)

Chemical reaction rate

b)

Experience and manufacturer advice

c)

Ambient humidity

d)

Tank geometry

5.

Key factors for selecting crushing and grinding equipment include all EXCEPT:

a)

Feed size and required product size distribution

b)

Throughput

c)

Material hardness and abrasiveness

d)

Color of the feed

6.

When evaluating material properties for comminution, engineers consider:

a)

Density, toxicity, flammability, stickiness

b)

Boiling point only

c)

Electrical conductivity

d)

Magnetic susceptibility only

7.

Wet grinding must be assessed to determine:

a)

If it is permissible

b)

The vapor pressure

c)

The freezing point

d)

The flame temperature

8.

Mixing of solids, liquids, and gases is essential in:

a)

Only final blending

b)

Nearly all stages of chemical production

c)

Only separation units

d)

Only laboratory work

9.

Mixing is often combined with other operations such as:

a)

Refrigeration only

b)

Reaction and heat transfer

c)

Filtration

d)

Drying only

10.

Many liquid and solid mixing operations are carried out as:

a)

Continuous processes exclusively

b)

Batch processes

c)

Vacuum distillations

d)

Electrochemical steps

11.

Specialized equipment is rarely needed for gas mixing because:

a)

Gases are dense

b)

Gases have low viscosity and mix easily

c)

Gas mixing is impossible

d)

Gravity separates gases

12.

Simple turbulent flow in a pipe is usually sufficient for:

a)

Liquid emulsification

b)

Gas mixing

c)

Powder blending

d)

Paste kneading

13.

To accelerate gas mixing, one can use:

a)

Centrifugal separators

b)

Turbulence promoters such as orifices or baffles

c)

Vacuum pumps

d)

Spray dryers

14.

Factors in choosing liquid mixing equipment include:

a)

Miscibility, viscosity, degree of mixing, and any coupled operations

b)

Only temperature

c)

Only color of liquids

d)

Only density

15.

Continuous mixing of low-viscosity fluids is effectively achieved with:

a)

Paddle mixers

b)

Inline mixers

c)

Z-blade mixers

d)

Cone blenders

16.

A mixing tee requires a downstream pipe length of about:

a)

1–2 pipe diameters

b)

10–20 pipe diameters

c)

50 pipe diameters

d)

No pipe length

17.

Mixing tees are suitable when fluids:

a)

Are highly viscous

b)

Have similar densities and flow rates

c)

Are solid slurries

d)

Require vacuum

18.

Injection mixers work by:

a)

Centrifugal force

b)

Entrainment and turbulent diffusion

c)

Laminar layering

d)

Magnetic stirring

19.

Injection mixers typically require about how much pipe length for complete mixing?

a)

20 pipe diameters

b)

80 pipe diameters

c)

5 pipe diameters

d)

200 pipe diameters

20.

Adding baffles to an injection mixer:

a)

Increases mixing length

b)

Reduces the required mixing length

c)

Has no effect

d)

Stops mixing

21.

Static inline mixers are effective in:

a)

Turbulent flow only

b)

Both laminar and turbulent flow

c)

Laminar flow only

d)

No-flow conditions

22.

Static inline mixers are particularly useful for:

a)

Gases only

b)

Mixing viscous fluids

c)

Gas separation

d)

Filtration

23.

The most common equipment for blending liquids and preparing solutions is:

a)

Injection mixer

b)

Stirred tank with agitator

c)

Cyclone separator

d)

Cone blender

24.

Mixing in stirred tanks occurs mainly by:

a)

Gravity settling

b)

Turbulent eddies created by the agitator

c)

Magnetic alignment

d)

Bubble formation

25.

Bulk flow is especially important when mixing:

a)

Immiscible gases

b)

Miscible liquids and solids

c)

Vapors only

d)

Only powders

26.

High Reynolds number impellers are classified by:

a)

Blade count only

b)

Direction of predominant flow leaving the impeller

c)

Shaft diameter

d)

Tank material

27.

Flat-bladed (Rushton) turbines provide:

a)

Axial flow

b)

Radial flow

c)

Counter-current flow

d)

No flow

28.

Rushton turbines are best for:

a)

Bulk mixing only

b)

Shear-controlled processes

c)

Slow laminar blending

d)

Gas compression

29.

Typical impeller-to-tank diameter ratio for Rushton turbines is up to:

a)

0.2

b)

0.6

c)

1.0

d)

2.0

30.

For Rushton turbines, the liquid depth is usually:

a)

Half the tank diameter

b)

Equal to the tank diameter

c)

Twice the tank diameter

d)

Independent of diameter

31.

Propeller and pitched-blade turbines create:

a)

Radial flow

b)

Axial flow

c)

No mixing

d)

Counter-current flow

32.

Propeller or pitched-blade turbines are suited for:

a)

Very viscous fluids

b)

Bulk fluid mixing

c)

Powder blending

d)

Gas separation

33.

Paddle, anchor, and helical ribbon agitators are used for:

a)

High Reynolds number, low viscosity fluids

b)

More viscous fluids

c)

Gas-only mixing

d)

Aerosol formation

34.

Baffles in stirred tanks:

a)

Promote vortex formation

b)

Reduce vortexing and improve mixing

c)

Are purely decorative

d)

Increase stratification

35.

For blending flammable liquids, an intrinsically safer option is:

a)

High-speed Rushton turbine

b)

Liquid jet mixing

c)

Electric arc mixing

d)

Sonic agitation

36.

Cone blenders are primarily used for:

a)

Liquids only

b)

Free-flowing solids

c)

Viscous pastes

d)

Gases

37.

Ribbon blenders are suitable for:

a)

Only liquids

b)

Dry solids and solids–liquid blends

c)

Gas streams

d)

Laminar liquids

38.

Z-blade and pan mixers are used mainly for:

a)

High-speed gas mixing

b)

Kneading heavy pastes and doughs

c)

Free-flowing powders

d)

Cryogenic mixing

39.

A plant needs to mix two low-viscosity liquids continuously with similar densities. The cheapest effective choice is:

a)

Cone blender

b)

Mixing tee

c)

Rushton turbine

d)

Z-blade mixer

40.

To blend a small stream of additive into a large turbulent main stream, the best inline device is:

a)

Static mixer

b)

Injection mixer

c)

Anchor agitator

d)

Paddle mixer

41.

A manufacturer needs to knead a heavy paste for polymer production. The preferred equipment is:

a)

Propeller mixer

b)

Z-blade mixer

c)

Mixing tee

d)

Rushton turbine

42.

For viscous liquid blending requiring laminar flow, the best inline option is:

a)

Static inline mixer

b)

Mixing tee

c)

Gas ejector

d)

Spray dryer

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