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 1 of 46

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Q1.
General crushing equation is given by following equation. Bond's crushing law is obtained by solving this equation for n = __________ and feed of infinite size.

a.

1

b.

1.5

c.

2

d.

2.5

Discuss
Answer: (b).1.5
Q2.
According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q3.
Critical Speed (Nc) of a ball mill is given by(where Rโ‚ and Rโ‚‚ are radii of ball mill and the ball respectively).

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q4.
Which of the following equations is Rittinger's crushing law ?
(where P = power required by the machine, m = feed rate, k = a constant, Dฬ…sa & Dฬ…sb = volume surface mean diameter of feed & product respectively.)

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q5.
About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q6.
rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q7.
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ฯL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is ฮด and no cake is formed. The initial pressure drop during filtration is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q8.
Half the angle of nip, (ฮฑ), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively).

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q9.
Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec² and, r = radius of trammel, metre. )

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q10.
The basic filtration equation is given as in the below figure, where, V is volume of the filtrate ; A is the filtration area, a is specific cake resistance, ฮผ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry.

In a 20 minutes constant rate filtration, 5 m³ of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m³ of filtrate to be produced ? Neglect filter medium resistance, Rm ; assume incompressible cake.

a.

10

b.

20

c.

25

d.

30

Discuss
Answer: (b).20
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