Process Control and Instrumentation MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Process Control and Instrumentation, 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 Process Control and Instrumentation 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 Process Control and Instrumentation mcq questions that explore various aspects of Process Control and Instrumentation problems. Each MCQ is crafted to challenge your understanding of Process Control and Instrumentation 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 Process Control and Instrumentation 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 Process Control and Instrumentation. 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 Process Control and Instrumentation knowledge to the test? Let's get started with our carefully curated MCQs!

Process Control and Instrumentation MCQs | Page 23 of 35

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Q221.
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

a.

-38.9

b.

-11.9

c.

-60.9

d.

-80.9

Discuss
Answer: (a).-38.9
Q222.
__________ controller has the maximum stabilising time.

a.

P

b.

PD

c.

PI

d.

PID

Discuss
Answer: (c).PI
Q223.
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

a.

mercury in glass thermometer.

b.

optical pyrometer.

c.

iron-constantan thermocouple.

d.

alcohol filled thermometer.

Discuss
Answer: (b).optical pyrometer.
Q224.
Stalagmometer is used for the measurement of

a.

kinematic viscosity

b.

surface tension

c.

refractive index

d.

optical activity

Discuss
Answer: (b).surface tension
Q225.
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

a.

d

b.

d²

c.

d³

d.

d⁴

Discuss
Answer: (d).d⁴
Q226.
Thermal conductivity cell is the primary element of a/an __________ analyser.

a.

oxygen

b.

carbon dioxide

c.

carbon monoxide

d.

sulphur dioxide

Discuss
Answer: (b).carbon dioxide
Q227.
Zirconia probe is used for the measurement of

a.

humidity of air.

b.

% CO₂ in flue gas.

c.

% O₂ in flue gas.

d.

speed of a submarine.

Discuss
Answer: (c).% O₂ in flue gas.
Q228.
The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches

a.

-1

b.

0

c.

1

d.

∞

Discuss
Answer: (d).∞
Q229.
__________ type of element is normally not used in the bimetallic thermometers.

a.

Flat spiral

b.

Bourdon tube

c.

Single helix

d.

Multiple helix

Discuss
Answer: (b).Bourdon tube
Q230.
Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as

a.

8, 0.6, 0.08

b.

12, 0.6, 0.12

c.

8, 0.6, 0.12

d.

12, 0.4, 0.08

Discuss
Answer: (b).12, 0.6, 0.12
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