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Process Control and Instrumentation
Comments
Question
Psychrometer determines the
Options
A. humidity of gases
B. moisture content of solids
C. water of crystallisation
D. hygroscopic nature of solids
Correct Answer
humidity of gases
Process Control and Instrumentation problems
Search Results
1. Transfer functions
X
/
Y
for which of the following block diagrams is
Options
A.
B.
C.
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer:
2. Pirani gauge is used for the measurement of
Options
A. very high pressure.
B. high vacuum.
C. liquid level under pressure.
D. liquid level at atmospheric pressure
Show Answer
Scratch Pad
Discuss
Correct Answer: high vacuum.
3. Which of the following is not a mechanical pressure sensing element?
Options
A. Bellows
B. Diaphragm
C. Bourdon tube
D. U-tube
Show Answer
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Discuss
Correct Answer: U-tube
4. Measurement of sub-zero Celcius temperature in industry is done most commonly by
Options
A. thermocouples
B. resistance thermometers
C. gas thermometers
D. bi-metallic thermometers
Show Answer
Scratch Pad
Discuss
Correct Answer: resistance thermometers
5. __________ are analysed using a polarograph.
Options
A. Isotonic solutions
B. Solids
C. Liquids
D. Gases
Show Answer
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Discuss
Correct Answer: Solids
6. 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'
7. 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:
8. 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
9. Alphatron measures pressure __________ microns.
Options
A. < 1
B. < 3
C. > 3
D. < 0.1
Show Answer
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Discuss
Correct Answer: > 3
10. 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
Scratch Pad
Discuss
Correct Answer: 1/(
s
2
+ 2
s
+ 2)
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