Chemical Engineering - Process Control and Instrumentation

21. 

A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

A. 2/s
B.
C.
D.

Answer: Option D

Explanation:

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22. 

The term analogous to the electrical current in a thermal system is the

A. temperature difference
B. heat flow rate
C. heat content in the system
D. none of these

Answer: Option B

Explanation:

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23. 

Reset rate is the another term used for __________ time.

A. dead
B. integral
C. derivative
D. none of these

Answer: Option B

Explanation:

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24. 

Continuous measurement of moisture in paper is done by

A. sling psychrometer.
B. hair-hygrometer.
C. weighing.
D. high resistance Wheatstone's bridge circuit.

Answer: Option D

Explanation:

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25. 

Psychrometer determines the

A. humidity of gases
B. moisture content of solids
C. water of crystallisation
D. hygroscopic nature of solids

Answer: Option A

Explanation:

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