GATE CH Instrumentation and Process Control PYQs & Answers — Page 3

Questions 21–30 of 54. Imported answers require independent review unless marked reviewed.

Liquid flowing through a heat exchanger (HX) is heated. A bypass stream is provided to control the temperature of the heated exit stream. From the given plumbing options, the one that provides the most effective temperature control for large disturbances while avoiding vaporization in the heat exchanger is

Your answerChoose one option.

Diagram for Chemical Engineering question 22

Diagram for Chemical Engineering question 22 (figure 2)

Diagram for Chemical Engineering question 22 (figure 3)

Diagram for Chemical Engineering question 22 (figure 4)

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The appropriate feedforward compensator,

, in the shown block diagram is

Diagram for Chemical Engineering question 23

Your answerChoose one option.

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Choose the option that correctly pairs the given measurement devices with the quantities they measure. The table lists: I — Bourdon Gauge; II — Orifice Plate meter; III — Pyrometer; IV — Colorimeter; V — Pirani Gauge. Quantities: A — Temperature; B — Concentration; C — Pressure; D — Flow rate; E — Liquid level.

Your answerChoose one option.

I-E II-C III-D IV-B V-A

I-C II-D III-A IV-B V-C

I-C II-D III-E IV-A V-D

I-D II-C III-A IV-E V-C

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A process described by the transfer function

is forced by a unit step input at time

. The output value immediately after the step input (at

) is ________ (rounded off to the nearest integer).

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In the block diagram shown in the figure, the transfer function

with

and

. The maximum value of

below which the system remains stable is __________ (rounded off to two decimal places).

Diagram for Chemical Engineering question 58

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Consider the tank level control system shown in the figure, where the cross-section area of the tank is

. Assume perfect flow controllers (FC). The level controller (LC) is proportional-integral (PI). For an integral time,

, the level controller gain,

, is tuned for critical damping. The value of

is ______ (rounded off to the nearest integer).

Diagram for Chemical Engineering question 59

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Consider a single-input-single-output (SISO) system with the transfer function

where the time constants are in minutes. The system is forced by a unit step input at time

. The time at which the output response reaches the maximum is __________ minutes (rounded off to two decimal places).

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Which of the following is NOT a standard to transmit measurement and control signals?

Your answerChoose one option.

4–20 mA

3–15 psig

0–100 %

1–5 VDC

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A feedforward controller can be used only if

Your answerChoose one option.

the disturbance variable can be measured

the disturbance variable can be manipulated

the disturbance variable can be ignored

regulatory control is not required

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The inherent characteristics of three control valves P, Q and R are shown in the figure.

Diagram for Chemical Engineering question 18

The CORRECT option(s)) is/are

Your answerSelect all correct options. You can choose more than one.

P is a quick opening valve

Q is a quick opening valve

P is an equal percentage valve

R is an equal percentage valve

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GATE CH Instrumentation and Process Control PYQs

Question 22

Question 23

Question 24

Question 34

Question 58

Question 59

Question 60

Question 11

Question 12

Question 18