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 12 of 35

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Q111.
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

a.

0°

b.

45°

c.

90°

d.

180°

Discuss
Answer: (d).180°
Q112.
In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T₁s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit

a.

overdamped response.

b.

underdamped response.

c.

undamped response.

d.

unstable response.

Discuss
Answer: (b).underdamped response.
Q113.
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

a.

magnetic flowmeter

b.

pitot tube

c.

flow nozzle type flowmeter

d.

turbine flowmeter

Discuss
Answer: (a).magnetic flowmeter
Q114.
Identify an unbounded input from inputs whose transfer functions are given below

a.

1

b.

1/S

c.

1/S²

d.

1/(S² + 1)

Discuss
Answer: (c).1/S²
Q115.
"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.

a.

Bode stability

b.

Nyquist

c.

Routh stability

d.

none of these

Discuss
Answer: (a).Bode stability
Q116.
Feed forward controller accounts for the __________ changes.

a.

set point

b.

load

c.

both (a) & (b)

d.

neither (a) nor (b)

Discuss
Answer: (b).load
Q117.
Which thermocouple can be used to measure a temperature of around 1400°C ?

a.

Copper-constantan

b.

Aluminium-chromel

c.

Platinum-platinum+rhodium

d.

None of these

Discuss
Answer: (c).Platinum-platinum+rhodium
Q118.
Radiation pyrometers as compared to thermocouples

a.

has a slower speed of response.

b.

can measure higher temperature.

c.

can't measure the temperature of moving objects.

d.

is more affected by corrosive atmosphere.

Discuss
Answer: (b).can measure higher temperature.
Q119.
Liquid flow rate in a small channel is best measured by a/an

a.

weir

b.

pitot tube

c.

vane meter

d.

venturimeter

Discuss
Answer: (b).pitot tube
Q120.
Specific gravity of a liquid can not be measured by a/an

a.

anemometer

b.

specific gravity bottle

c.

pycnometer

d.

hydrometer

Discuss
Answer: (a).anemometer
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