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Discussion
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Chemical Engineering
‣
Process Control and Instrumentation
Comments
Question
The __________ of a vapor pressure thermometer is a secondary element.
Options
A. pointer
B. Bourdon tube
C. bulb
D. none ofthese
Correct Answer
Bourdon tube
Process Control and Instrumentation problems
Search Results
1. The transfer function for a PID controller is (where, ?
i
is the integral (reset) time and ?
D
is the derivative time.)
Options
A.
K
c
(1 + ?
i
s
+ ?
D
).
s
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
2. Smoke density of the flue gas going out of the chimney is measured by a
Options
A. polarograph
B. thermal conductivity meter
C. photo electric cell
D. chromatograph
Show Answer
Scratch Pad
Discuss
Correct Answer: photo electric cell
3. Which of the following measurements can be made by the measurement of emf?
Options
A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
D. All (a), (b) & (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: All (a), (b) & (c)
4. A negative gain margin expressed in decibels means a/an __________ system.
Options
A. stable
B. unstable
C. critically damped
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: unstable
5. A proportional controller with a gain of
K
c
is used to control a first order process. The offset will increase, if
Options
A.
K
c
is reduced.
B.
K
c
is increased.
C. integral control action is introduced.
D. derivative control action is introduced.
Show Answer
Scratch Pad
Discuss
Correct Answer:
K
c
is increased.
6. Pick out the wrong statement.
Options
A. O
2
, NO and NO
2
exhibit paramagnetic properties as a result of unpaired electrons.
B. CO
2
is the strongest paramagnetic gas.
C. Paramagnetic susceptibility of gases decreases with temperature.
D. Paramagnetic susceptibility of gases permits the measurement of their concentration.
Show Answer
Scratch Pad
Discuss
Correct Answer: CO
2
is the strongest paramagnetic gas.
7. The closed loop pole of a stable second order system could be
Options
A. both real and positive.
B. complex conjugate with positive real parts.
C. both real and negative.
D. one real positive and the other real negative.
Show Answer
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Discuss
Correct Answer: both real and negative.
8. Working principle of radiation pyrometer is based on the
Options
A. Wien's law
B. Kirchoffs law
C. Stafan-Boltzman law
D. Seebeck effect
Show Answer
Scratch Pad
Discuss
Correct Answer: Stafan-Boltzman law
9. A magnetic flowmeter is
Options
A. based on the principle of Faraday's law.
B. capable of measuring the flow rate of slurries and electrolytes.
C. based on the linear relationship between the fluid flow rate and the induced voltage.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
10. In a single tank system, the transfer function of level to inlet flow rate is
Options
A.
R
/
TS
B.
R
/(
TS
+ 1)
C. l(
TS
+ l)
D. 1/
TS
Show Answer
Scratch Pad
Discuss
Correct Answer:
R
/(
TS
+ 1)
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