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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
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
Correct Answer
proportional to the square root of
Process Control and Instrumentation problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: stefan-Boltzman law
2. Polarisation of light forms the working principle of a
Options
A. polarimeter
B. polarograph
C. chromatograph
D. spectrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: polarimeter
3. 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
Scratch Pad
Discuss
Correct Answer: Ionisation gauge
4. Mercury manometer (U-tube type) exemplifies a __________ order system.
Options
A. zero
B. first
C. second
D. third
Show Answer
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Discuss
Correct Answer: second
5. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
Options
A. Nickel
B. Brass
C. Chromel
D. Invar
Show Answer
Scratch Pad
Discuss
Correct Answer: Brass
6. 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
7. Dead zone in an instrument must be less than __________ percent of the scale.
Options
A. 0.2
B. 1.5
C. 4
D. 8
Show Answer
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Discuss
Correct Answer: 0.2
8. 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
9. 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
10. 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
Scratch Pad
Discuss
Correct Answer: e
-?
s
s
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