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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Alphatron measures pressure __________ microns.
Options
A. < 1
B. < 3
C. > 3
D. < 0.1
Correct Answer
> 3
Process Control and Instrumentation problems
Search Results
1. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
Options
A. 1
B. >1
C. < 1
D. none of these
Show Answer
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Discuss
Correct Answer: < 1
2. The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below :
The appropriate transfer function of the process is
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
3. The characteristic equation for the control system with a closed loop transfer function
G
1
/1 +
G
2
is given by 1 +
G
2
= 0. The characteristic equation for the control system
Options
A. depends only upon the open loop transfer function.
B. determines its stability.
C. is the same for set point or load changes.
D. all 'a', 'b' & 'c'
Show Answer
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Discuss
Correct Answer: all 'a', 'b' & 'c'
4. Psychrometer determines the
Options
A. humidity of gases
B. moisture content of solids
C. water of crystallisation
D. hygroscopic nature of solids
Show Answer
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Correct Answer: humidity of gases
5. Transfer functions
X
/
Y
for which of the following block diagrams is
Options
A.
B.
C.
D. none of these
Show Answer
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Discuss
Correct Answer:
6. Which of the systems having following transfer functions is stable?
Options
A. 1/(
s
2
+ 2)
B. 1/(
s
2
-2
s
+ 3)
C. 1/(
s
2
+ 2
s
+ 2)
D. exp(-20
s
)/(
s
2
+ 2
s
-l)
Show Answer
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Discuss
Correct Answer: 1/(
s
2
+ 2
s
+ 2)
7. High temperature of around 2000°C of incandescent gas mantles is measured by a/an
Options
A. specially designed thermocouple.
B. optical pyrometer.
C. radiation pyrometer.
D. none of these.
Show Answer
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Discuss
Correct Answer: radiation pyrometer.
8. The temperature range for which copper resistance thermometer can be used is __________ °C
Options
A. 0 to 150
B. -200 to 150
C. 350 to 750
D. 500 to 900
Show Answer
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Discuss
Correct Answer: -200 to 150
9. Reset rate is the another term used for __________ time.
Options
A. dead
B. integral
C. derivative
D. none of these
Show Answer
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Discuss
Correct Answer: integral
10. What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?
Options
A. 0.1
B. 3
C. 13
D. 29
Show Answer
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Discuss
Correct Answer: 13
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