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Chemical Engineering Objective Questions { Process Control and Instrumentation }



246. Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.
A. < 100
B. < 0
C. > 0
D. > 800
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247. A non-linear system will have __________ steady state values.
A. One
B. More than one
C. Two
D. Three
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248. __________ 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
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249. Which of the systems having following transfer functions is stable?
A. $$\frac{1}{{{{\text{s}}^2} + 2}}$$
B. $$\frac{1}{{{{\text{s}}^2} - 2{\text{s}} + 3}}$$
C. $$\frac{1}{{{{\text{s}}^2} + 2{\text{s}} + 2}}$$
D. $$\frac{{{\text{exp}}\left( { - 20{\text{s}}} \right)}}{{{{\text{s}}^2} + 2{\text{s}} - 1}}$$
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250. Use of I-control along with P-control facilitates
A. Elimination of offset
B. Reduction of offset
C. Reduction of stability time
D. None of these
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251. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?
A. Platinum-platinum + rhodium
B. Iron-constantan
C. Copper-constantan
D. Chromel-alumel
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252. Psychrometer determines the
A. Humidity of gases
B. Moisture content of solids
C. Water of crystallisation
D. Hygroscopic nature of solids
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