Chemical Engineering - Process Control and Instrumentation

31. 

Thermal conductivity cell is the primary element of a/an __________ analyser.

A. oxygen
B. carbon dioxide
C. carbon monoxide
D. sulphur dioxide

Answer: Option B

Explanation:

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32. 

Zirconia probe is used for the measurement of

A. humidity of air.
B. % CO2 in flue gas.
C. % O2 in flue gas.
D. speed of a submarine.

Answer: Option C

Explanation:

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33. 

The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches

A. -1
B. 0
C. 1
D.

Answer: Option D

Explanation:

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34. 

__________ type of element is normally not used in the bimetallic thermometers.

A. Flat spiral
B. Bourdon tube
C. Single helix
D. Multiple helix

Answer: Option B

Explanation:

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35. 

Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as

A. 8, 0.6, 0.08
B. 12, 0.6, 0.12
C. 8, 0.6, 0.12
D. 12, 0.4, 0.08

Answer: Option B

Explanation:

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