Chemical Engineering - Process Control and Instrumentation

41. 

The symbol for "capillary line" in instrumentation diagram is

A.
B.
C.
D.

Answer: Option B

Explanation:

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42. 

__________ 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:

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43. 

Select the correct statement from the following.

A. The frequency response of a pure capacity process is unbounded.
B. The phase lag of a pure time delay system decreases with increasing frequency.
C. The amplitude ratio of a pure capacity process is inversely proportional to frequency.
D. The amplitude ratio of a pure time delay system increases with frequency.

Answer: Option C

Explanation:

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44. 

For an input forcing function, X(t) = 2t2, the Laplace transform of this function is

A. 2/s2
B. 4/s2
C. 2/s3
D. 4/s3

Answer: Option D

Explanation:

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45. 

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

A. thermocouple
B. reistance thermometer
C. mercury in glass thermometer
D. vapor pressure thermometer

Answer: Option A

Explanation:

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