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Process Control and Instrumentation - Section 1 (2)

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  • Process Control and Instrumentation - Section 1
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Process Control and Instrumentation - Section 1

These are the problems based on process control
and instrumentation and there are many MCQs available in this section to solve.

9. 

__________ is undesirable in thermocouples used in industries,

A. Linear relation of emf to temperature
B. Corrosion resistance
C. Oxidation resistance
D. Non-linear relation of emf to temperature

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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10. 

The symbol for "capillary line" in instrumentation diagram is

A. 344-49-1
B. 344-49-2
C. 344-49-3
D. 344-49-4

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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11. 

A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

A. Kc is reduced.
B. Kc is increased.
C. integral control action is introduced.
D. derivative control action is introduced.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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12. 

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

A. Platinum-platinum + rhodium.
B. Iron-constantan.
C. Chromel-constantan.
D. All will give the same output.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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13. 

Nichol's chart deals with

A. A.R. vs. phase lag of first order.
B. A.R. vs. phase lag of second order.
C. closed loop values vs. open loop values.
D. frequency response values of controllers.

Answer: Option C

Explanation:

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14. 

The function of a transducer is to

A. modify the input signal.
B. amplify the input signal.
C. convert the primary signal into a more useful quantity, usually an electric impulse.
D. codify/decodify the input signal.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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15. 

Compositional analysis of __________ is done using mass spectrometer.

A. an isotope
B. natural gas
C. a solid
D. an alloy

Answer: Option A

Explanation:

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16. 

The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.)

A. Kc(1 + τis + τD ). s
B. 383-599-1u
C. 383-599-2
D. 383-599-3

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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