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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
The __________ of a vapor pressure thermometer is a functioning element.
Options
A. pointer
B. bourdon tube
C. bulb
D. none of these
Correct Answer
pointer
Process Control and Instrumentation problems
Search Results
1. The symbol for "capillary line" in instrumentation diagram is
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
2. Load cells are used for the measurement of
Options
A. stress
B. weight
C. strain
D. velocity
Show Answer
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Discuss
Correct Answer: weight
3. Select the correct statement from the following.
Options
A. The frequency response of a pure capacity process is unbounded.
B. The phase lag of a pure time delay system decreases with increasing frequency.
C. The amplitude ratio of a pure capacity process is inversely proportional to frequency.
D. The amplitude ratio of a pure time delay system increases with frequency.
Show Answer
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Discuss
Correct Answer: The amplitude ratio of a pure capacity process is inversely proportional to frequency.
4. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?
Options
A. Radiation/infrared pyrometer
B. Filled system thermometer
C. Mercury in glass thermometer
D. Thermo electric pyrometer
Show Answer
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Discuss
Correct Answer: Radiation/infrared pyrometer
5. Flapper nozzle is used in a/an __________ controller.
Options
A. electronic
B. hydraulic
C. pneumatic
D. none of these
Show Answer
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Discuss
Correct Answer: pneumatic
6. 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
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Discuss
Correct Answer: 4/
s
3
7. 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
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Discuss
Correct Answer: both (a) & (b)
8. 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
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Correct Answer: All (a), (b) and (c).
9. 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
Show Answer
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Discuss
Correct Answer: manipulated
10. 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
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Discuss
Correct Answer: > 1.7 and > 30°
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