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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
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.
Correct Answer
K
c
is increased.
Process Control and Instrumentation problems
Search Results
1. Instrumentation in a plant offers the advantage of
Options
A. greater safety of operation
B. better quality of product
C. greater operation economy
D. all (a), (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c)
2. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
Options
A. chromel-alumel
B. iron-constantan
C. platinum-platinum+rhodium
D. either (a), (b) or (c)
Show Answer
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Discuss
Correct Answer: platinum-platinum+rhodium
3. Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.
Options
A. oxygen in
B. carbon dioxide in
C. carbon monoxide in
D. temperature of
Show Answer
Scratch Pad
Discuss
Correct Answer: oxygen in
4. Which of the following is a desirable characteristic of an instrument?
Options
A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility
Show Answer
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Discuss
Correct Answer: High fidelity
5. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
Options
A. insulator
B. conductor
C. solid semi-conductor
D. liquid semi-conductor
Show Answer
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Discuss
Correct Answer: solid semi-conductor
6. 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
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Discuss
Correct Answer: unstable
7. 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
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Discuss
Correct Answer: All (a), (b) & (c)
8. 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
9. 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:
10. The __________ of a vapor pressure thermometer is a secondary element.
Options
A. pointer
B. Bourdon tube
C. bulb
D. none ofthese
Show Answer
Scratch Pad
Discuss
Correct Answer: Bourdon tube
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