Mechanical Operations MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Mechanical Operations, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Mechanical Operations MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Mechanical Operations mcq questions that explore various aspects of Mechanical Operations problems. Each MCQ is crafted to challenge your understanding of Mechanical Operations principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Mechanical Operations MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Mechanical Operations. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Mechanical Operations knowledge to the test? Let's get started with our carefully curated MCQs!

Mechanical Operations MCQs | Page 32 of 46

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Q311.
In closed circuit grinding as compared to open circuit grinding, the

a.

specific surface of product is more.

b.

product has lesser size uniformity.

c.

production rate at a given limiting size is lower.

d.

operation is economical.

Discuss
Answer: (d).operation is economical.
Q312.
Pick out the correct statement.

a.

Angle of repose is always greater than the angle of slide.

b.

A hopper is a small bin with a sloping bottom.

c.

A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal.

d.

Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process.

Discuss
Answer: (b).A hopper is a small bin with a sloping bottom.
Q313.
Separation of solid particles based on their densities is called

a.

sizing

b.

sorting

c.

clarification

d.

dispersion

Discuss
Answer: (b).sorting
Q314.
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

a.

Cresylic acid

b.

Copper sulphate

c.

Calcium carbonate

d.

Sodium carbonate

Discuss
Answer: (b).Copper sulphate
Q315.
__________ are mixed using ribbon blenders.

a.

Lumpy solids and low viscosity liquids

b.

Dry powders

c.

High viscosity liquids

d.

Thick pastes

Discuss
Answer: (b).Dry powders
Q316.
During agitation of liquids, the

a.

Froude number is independent for the curves between power number and Reynolds number in baffled system.

b.

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller.

c.

Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number.

d.

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

Discuss
Answer: (d).all (a), (b) and (c).
Q317.
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to

a.

the new surface created.

b.

the size reduction ratio.

c.

the change in volume due to crushing.

d.

none of these.

Discuss
Answer: (a).the new surface created.
Q318.
Traces of liquid tar fog present in coke oven gas is separated using

a.

electrostatic precipitator

b.

cyclone separator

c.

strainer

d.

none of these

Discuss
Answer: (a).electrostatic precipitator
Q319.
Close circuit grinding by a ball mill with air sweeping employs a

a.

classifier.

b.

cyclone separator between mill & classifier.

c.

both (a) & (b).

d.

neither (a) nor (b).

Discuss
Answer: (c).both (a) & (b).
Q320.
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

a.

1.0

b.

0.5

c.

1.34

d.

4.34

Discuss
Answer: (c).1.34
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