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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Dead zone in an instrument must be less than __________ percent of the scale.
Options
A. 0.2
B. 1.5
C. 4
D. 8
Correct Answer
0.2
Process Control and Instrumentation problems
Search Results
1. Bode stability method uses __________ loop transfer function.
Options
A. open
B. closed
C. either (a) or (b)
D. neither (a) nor (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: open
2. Flow rate through an orifice is __________ the pressure differential.
Options
A. proportional to
B. inversely proportional to the square root of
C. proportional to the square root of
D. inversely proportional to the square of
Show Answer
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Discuss
Correct Answer: proportional to the square root of
3. Working principle of radiation pyrometer is based on the
Options
A. Wien's law
B. Kirchoffs law
C. stefan-Boltzman law
D. Seebeck effect
Show Answer
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Discuss
Correct Answer: stefan-Boltzman law
4. Polarisation of light forms the working principle of a
Options
A. polarimeter
B. polarograph
C. chromatograph
D. spectrometer
Show Answer
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Discuss
Correct Answer: polarimeter
5. Which is the most suitable instrument for measuring pressure below 3 microns?
Options
A. Mcleoid gauge
B. Alphatron
C. Ionisation gauge
D. Bourdon guage
Show Answer
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Discuss
Correct Answer: Ionisation gauge
6. Liquid levels in autocalves are measued by
Options
A. simple float
B. differential float type manometer
C. glass gauge
D. none of these
Show Answer
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Discuss
Correct Answer: differential float type manometer
7. Process degree of freedom indicates __________ number of controllers to be used.
Options
A. the maximum
B. the minimum
C. both maximum and the minimum
D. nothing about the
Show Answer
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Discuss
Correct Answer: the maximum
8. The transfer function of a pure dead time system with dead time ?
d
is
Options
A. 1/(?
d
s + 1)
B. ?
d
s + 1
C. e
-?
s
s
D. e
?
d
s
Show Answer
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Discuss
Correct Answer: e
-?
s
s
9. Gas analysis is commonly done using the
Options
A. thermal conductivity cell
B. X-ray diffraction
C. mass spectrometer
D. emission spectrometer
Show Answer
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Discuss
Correct Answer: thermal conductivity cell
10. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same
Options
A. temperature measuring range (- 40°C to 450°C).
B. accuracy (± 1% of span).
C. speed of response.
D. all a, b & c.
Show Answer
Scratch Pad
Discuss
Correct Answer: all a, b & c.
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