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 3 of 46

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Q21.
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
Q22.
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
Q23.
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
Q24.
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
Q25.
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
Q26.
The distribution given by microscopic analysis of powder is

a.

number

b.

length

c.

area

d.

volume

Discuss
Answer: (a).number
Q27.
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vโ‚š = volume of one particle, ฯ= density of particles)

a.

m/ฯ . Vโ‚š

b.

m . ฯ/Vโ‚š

c.

m . Vโ‚š/ฯ

d.

Vโ‚š/m . ฯ

Discuss
Answer: (a).m/ฯ . Vโ‚š
Q28.
For a non-spherical particle, the sphericity

a.

is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.

b.

has the dimension of length.

c.

is always less than 1.

d.

is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle.

Discuss
Answer: (a).is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
Q29.
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

a.

4

b.

1/4

c.

1

d.

1/2

Discuss
Answer: (b).1/4
Q30.
Ball mills and tube mills with flint or porcelain balls are used for size reduction of

a.

asbestos

b.

rubber

c.

non-metallic ores

d.

limestone

Discuss
Answer: (c).non-metallic ores
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