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Process Control and Instrumentation

Free 320+ Process Control and Instrumentation MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Process Control and Instrumentation — MCQs for Pakistan government job tests

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Process Control and Instrumentation

Practice questions

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1.Identify the device that qualifies as a first-order instrument.

2.Identify the first-order system from the options listed below.

3.Which of the following statements is accurate?

4.Identify the incorrect statement from the following:

5.Identify the incorrect statement from the following:

6.If a radioactive substance has a half-life of 12 years, how many years will it take for the substance to decay to half of its initial mass?

7.What is the term for the frequency at which the amplitude ratio reaches its highest value?

8.For which temperature ranges is a thermocouple appropriate for measurement?

9.What is the Laplace transform of the integral from 0 to t of the function f(τ) = τ with respect to τ?

10.How is the phase margin calculated in control systems?

11.A continuous flue gas analyzer utilizes the paramagnetic nature of certain gases that are attracted to the strongest magnetic field regions, causing diamagnetic gases to be displaced. Which of the following gases is classified as diamagnetic?

12.Which of the following represents a non-linear chemical system?

13.What type of dissimilar metal components do all thermocouples utilize for measuring temperature?

14.What does the term 'dead zone' refer to in instrumentation?

15.A first-order system with unity gain and a time delay has a time constant of 5 minutes. If the phase lag measured at a frequency of 0.2 rad/min is 60°, what is the dead time (in minutes)?

16.What is the transfer function expression for a Proportional-Derivative (P-D) controller?

17.Water flows into a storage tank at temperature T0 with a flow rate of Q0 and exits at temperature T with flow rate Q. Assuming negligible heat loss and that the tank has a cross-sectional area A0, which equation correctly represents the temperature change of water in the tank over time?

18.For the closed-loop system with an open-loop transfer function given by K (s + 1) / [2 (2s + 1)(3s + 1)], how many root loci branches will appear as the gain K varies from 0 to infinity?

19.Among these filled system expansion thermometers, which one can measure the lowest positive temperatures?

20.What fundamental principle does a mercury-in-glass thermometer operate on?

How to prepare with Process Control and Instrumentation MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Process Control and Instrumentation appears in real exam conditions.

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