Chemical Engineering - Process Control and Instrumentation

26. 

A sinusoidal variation in the input passing through a linear first order system

A. becomes more oscillatory (frequency increases).
B. becomes less oscillatory (frequency decreases).
C. gets amplified (magnitude increases).
D. gets attenuated (magnitude decreases).

Answer: Option D

Explanation:

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27. 

Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

A. 0-100
B. < 0
C. > 100.
D. > 50

Answer: Option C

Explanation:

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28. 

What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2.

A.
B.
C.
D.

Answer: Option B

Explanation:

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29. 

Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

A. mercury thermometer
B. bimetallic thermometer
C. radiation pyrometer
D. none of these

Answer: Option B

Explanation:

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30. 

Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the

A. enhancement or attentuation of redia-tion occurs in the sighting path.
B. object and surrounding are at almost the same temperature.
C. object has varying emissivity.
D. object is transparent.

Answer: Option B

Explanation:

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