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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
Options
A. load
B. controlled
C. manipulated
D. none of these
Correct Answer
manipulated
Process Control and Instrumentation problems
Search Results
1. Pick out the one which is a first order instrument.
Options
A. Mercury in glass thermometer (without any covering or air gap).
B. Bare metallic thermometer.
C. Bare vapor pressure thermometer.
D. All (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: All (a), (b) and (c).
2. Temperature measuring instruments are standardised mostly with __________ points of pure substances.
Options
A. melting
B. boiling
C. both (a) & (b)
D. neither (a) nor (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) & (b)
3. For an input forcing function,
X
(
t
) = 2
t
2
, the Laplace transform of this function is
Options
A. 2/
s
2
B. 4/
s
2
C. 2/
s
3
D. 4/
s
3
Show Answer
Scratch Pad
Discuss
Correct Answer: 4/
s
3
4. The __________ of a vapor pressure thermometer is a functioning element.
Options
A. pointer
B. bourdon tube
C. bulb
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: pointer
5. The symbol for "capillary line" in instrumentation diagram is
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
6. Typical specifications for design stipulates the gain margin and phase margin to be respectively
Options
A. > 1.7 and > 30°
B. < 1.7 and > 30°
C. < 1.7 and < 30°
D. > 1.7 and < 30°
Show Answer
Scratch Pad
Discuss
Correct Answer: > 1.7 and > 30°
7. __________ is undesirable in thermocouples used in industries,
Options
A. Linear relation of emf to temperature
B. Corrosion resistance
C. Oxidation resistance
D. Non-linear relation of emf to temperature
Show Answer
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Discuss
Correct Answer: Non-linear relation of emf to temperature
8. Pick out the first order system from among the following.
Options
A. Damped vibrator.
B. Mercury in glass thermometer kept in boiling water.
C. Interacting system of two tanks in series.
D. Non-interacting system of two tanks in series.
Show Answer
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Discuss
Correct Answer: Mercury in glass thermometer kept in boiling water.
9. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.
Options
A. Kelvin
B. Centigrade
C. Fahrenheit
D. Reaumer
Show Answer
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Discuss
Correct Answer: Fahrenheit
10. The function of a transducer is to
Options
A. modify the input signal.
B. amplify the input signal.
C. convert the primary signal into a more useful quantity, usually an electric impulse.
D. codify/decodify the input signal.
Show Answer
Scratch Pad
Discuss
Correct Answer: convert the primary signal into a more useful quantity, usually an electric impulse.
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