Mixing

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What is the primary function of a tumble blender?

To heat and knead dough

To blend liquids into slurries

To mix materials with low impact (correct)

To spray liquids onto powders

What power requirement is characteristic of dough and paste mixers?

High power for good mixing efficiency (correct)

No specific power requirements

Moderate power for gentle mixing

Low power to reduce heat generation

When using a tumble blender, what is the range of speed it typically operates at?

1 to 10 revolutions per minute

5 to 25 revolutions per minute (correct)

10 to 50 revolutions per minute

30 to 60 revolutions per minute

Which mixer configuration is specifically identified for its use in dough mixing?

Two contra-rotating arm mixer Signup and view all the answers

What is one method to manage heat generation in dough and paste mixers?

Employing jackets with cooling water Signup and view all the answers

What is the primary reason for mixing components in food preparation?

To achieve consistency in the final product Signup and view all the answers

Which of the following does NOT contribute to segregation in a mixture?

Differences in temperature Signup and view all the answers

What type of mixing occurs when all powder moves in a first in – first out sequence?

Mass flow Signup and view all the answers

Which purpose of agitation involves creating an emulsion or suspension?

Dispersing an immiscible liquid Signup and view all the answers

What factor is NOT a characteristic considered when selecting mixing equipment?

Color of the ingredients Signup and view all the answers

What is an example of a characteristic of a perfect mixture?

Homogeneous distribution of components Signup and view all the answers

Which mixing behavior leads to a reduction in segregation?

Mass flow Signup and view all the answers

What happens during the agitation of a liquid?

A particular flow pattern is established Signup and view all the answers

What is a primary function of baffles in a mixing vessel?

To reduce radial and tangential flow Signup and view all the answers

Which type of impeller is most commonly used for mixing low to moderate viscosity liquids?

Paddle impeller Signup and view all the answers

What is a significant disadvantage of marine propellers?

Not suitable for very viscous liquids Signup and view all the answers

What type of flow is generated by radial-flow impellers?

Flow perpendicular to the impeller shaft Signup and view all the answers

Which of the following mixing methods would likely be most effective for mixing small quantities of one component into a larger quantity?

Stage-wise blending Signup and view all the answers

What is the primary benefit of using Rushton turbines?

They are effective across a range of viscosities Signup and view all the answers

What is the typical rotational speed of paddle impellers?

20-150 rpm Signup and view all the answers

How are ribbon blenders structured?

U-shaped trough with inner and outer helical ribbons Signup and view all the answers

What does axial flow impeller produce?

Flow parallel to the impeller Signup and view all the answers

Which of the following is a key characteristic of the marine propeller?

It operates effectively at speeds of around 1000 rpm Signup and view all the answers

What is the ideal result of using baffles in a baffled vessel?

Improving mixing efficiency Signup and view all the answers

What aspect of impeller geometry affects flow patterns in mixer vessels?

Shape and angle of the blades Signup and view all the answers

What is an example of a method to prevent vortex formation in mixing vessels?

Using off-center mounted impellers Signup and view all the answers

What is an essential consideration when choosing a type of mixer for processing different viscosities?

The flow patterns generated Signup and view all the answers