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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

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1.Consider a closed-loop control system where the process to be regulated is an integrating process with a transfer function of 1/(2s). The controller used is an integral controller with a transfer function of 1/(T1s). When a step input is applied to the set point in this system, what type of response will the controlled variable display?

2.Which of the following physical systems commonly exhibits an underdamped response?

3.Which stability criterion states that a control system becomes unstable if its open-loop frequency response has a gain greater than one at the crossover frequency?

4.In a second-order underdamped system, what is the term for the duration it takes the response to first reach its final value?

5.Which device is incapable of measuring temperatures as high as 1600°C?

6.Which of these devices is unsuitable for recording temperatures below freezing (under 0°C)?

7.What is the highest differential pressure, measured in psi, that a liquid manometer can typically handle?

8.Among the following gases, which one exhibits the strongest paramagnetic properties?

9.For what range of pressure values (in kgf/cm²) are liquid column manometers typically used?

10.In the paper manufacturing industry, which method is commonly used for continuous monitoring of the paper's moisture content?

11.What type of pressure is measured by a McLeod gauge?

12.Based on the Bode stability criterion, when is a system considered unstable in terms of its open-loop frequency response amplitude and phase lag?

13.A standard mercury-in-glass thermometer can measure temperatures up to 120°C. To measure temperatures as high as __________ °C, the thermometer is designed with pressurized nitrogen above the mercury. This prevents mercury evaporation and minimizes the risk of the mercury column breaking. What is this maximum temperature?

14.What does pyrometry specifically measure?

15.Which instrument is inappropriate for accurately measuring the temperature of a red-hot object within the 800 to 1600°C range?

16.Water flows through four connected tanks and is heated along the way, as illustrated. To implement a cascade control system that regulates the temperature of the water exiting tank 4, considering a disturbance in the temperature of a secondary stream entering tank 2, where is the optimal location for the secondary measurement in the inner control loop?

17.Consider a first-order system with a unity gain and a time constant η. If the system is driven by a sinusoidal input with an angular frequency ω = 1/η, what is the amplitude ratio of the output to the input?

18.What is the melting point of silver in degrees Celsius?

19.What is the Laplace transform of the function sin(t)?

20.Thermistors exhibiting a very high temperature coefficient of resistivity are classified under which type of solid?

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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