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 24 of 46

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Q231.
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wแตข, then the same for open circuit grinding will be

a.

0.5 Wแตข

b.

Wแตข

c.

1.34 Wแตข

d.

3.34 Wแตข

Discuss
Answer: (c).1.34 Wแตข
Q232.
Maximum size reduction in a fluid energy mill is achieved by

a.

compression

b.

interparticle attrition

c.

cutting

d.

impact

Discuss
Answer: (b).interparticle attrition
Q233.
With increase in the capacity of screens, the screen effectiveness

a.

remains unchanged

b.

increases

c.

decreases

d.

decreases exponentially

Discuss
Answer: (c).decreases
Q234.
As particle size is reduced

a.

screening becomes progressively more difficult.

b.

screening becomes progressively easier.

c.

capacity and effectiveness of the screen is increased.

d.

none of these.

Discuss
Answer: (a).screening becomes progressively more difficult.
Q235.
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

a.

state or manner of application of the crushing force.

b.

ultimate strength of the material.

c.

elastic constant of the material.

d.

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

Discuss
Answer: (d).all (a), (b) and (c).
Q236.
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

a.

200°C and 5 atm.

b.

1000°C and 10 atm.

c.

500°C and 50 atm.

d.

1000°C and 500 atm.

Discuss
Answer: (b).1000°C and 10 atm.
Q237.
For efficient grinding, ball mills must be operated

a.

at a speed less than the critical speed.

b.

at a speed more than the critical speed.

c.

at a speed equal to the critical speed.

d.

with minimum possible small balls.

Discuss
Answer: (a).at a speed less than the critical speed.
Q238.
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

a.

primary

b.

secondary

c.

fine

d.

ultrafine

Discuss
Answer: (c).fine
Q239.
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

a.

ฯ€(=A/D²)

b.

ฯ€/6(=V/D³)

c.

AD/V

d.

None of these.

Discuss
Answer: (a).ฯ€(=A/D²)
Q240.
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

a.

Df/Dp

b.

Dp/Df

c.

Df - Dp

d.

none of these

Discuss
Answer: (a).Df/Dp
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