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 30 of 46

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Q291.
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).
Q292.
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.
Q293.
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
Q294.
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).
Q295.
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
Q296.
Choke crushing (in case of a Jaw crusher) compared to free crushing

a.

results in increased capacity.

b.

consumes less power.

c.

consumes more power.

d.

both (a) and (c).

Discuss
Answer: (c).consumes more power.
Q297.
The specific surface of sherical particles is proportional to (where, Dₚ = diameter of particle).

a.

D²ₚ

b.

Dp

c.

1/Dₚ

d.

1/D²ₚ

Discuss
Answer: (c).1/Dₚ
Q298.
Wheat is ground into flour in a

a.

hammer crusher

b.

roller crusher

c.

impact mill

d.

fluid energy mill

Discuss
Answer: (b).roller crusher
Q299.
Gravity stamp mill is meant for the __________ crushing.

a.

primary

b.

intermediate

c.

fine

d.

ultrafine

Discuss
Answer: (c).fine
Q300.
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

a.

density separation.

b.

differential wettability.

c.

size.

d.

volatile matter content.

Discuss
Answer: (a).density separation.
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