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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Zirconia probe is used for the measurement of
Options
A. humidity of air.
B. % CO
2
in flue gas.
C. % O
2
in flue gas.
D. speed of a submarine.
Correct Answer
% O
2
in flue gas.
Process Control and Instrumentation problems
Search Results
1. Phase lag of the frequency response of a second order system to a sinusoidal forcing function
Options
A. is 30°
B. is 90° at the most
C. approaches 180° asymptotically
D. is 120°
Show Answer
Scratch Pad
Discuss
Correct Answer: approaches 180° asymptotically
2. Stalagmometer is used for the measurement of
Options
A. kinematic viscosity
B. surface tension
C. refractive index
D. optical activity
Show Answer
Scratch Pad
Discuss
Correct Answer: surface tension
3. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to
Options
A. d
B. d
2
C. d
3
D. d
4
Show Answer
Scratch Pad
Discuss
Correct Answer: d
4
4. Thermistors are used in __________ devices.
Options
A. voltage measuring
B. temperature measuring
C. temperature compensating
D. both(b)&(c)
Show Answer
Scratch Pad
Discuss
Correct Answer: both(b)&(c)
5. Which of following error integral is considered as the best criterion in controller settings?
Options
A.
B.
C.
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer:
6. Which of the following fluid flow measuring devices can measure the largest flow rate?
Options
A. V-notch
B. Rotameter
C. Orificemeter
D. Weir
Show Answer
Scratch Pad
Discuss
Correct Answer: Weir
7. Polarograph is meant for the analysis of
Options
A. gaseous mixture
B. miscible liquids
C. solids
D. isotopes
Show Answer
Scratch Pad
Discuss
Correct Answer: solids
8. The root locus method, a pole of a transfer function
G
(
s
) is the value of s for which
G
(
s
) approaches
Options
A. -1
B. 0
C. 1
D. ?
Show Answer
Scratch Pad
Discuss
Correct Answer: ?
9. E.m.f. generated by thermocouples is of the order of
Options
A. millivolts
B. microvolts
C. volts
D. kilo volts
Show Answer
Scratch Pad
Discuss
Correct Answer: millivolts
10. Which of the following flow-metering instru-ments is an areameter?
Options
A. Venturimeter
B. Rotameter
C. Pitot tube
D. Hot wire anemometer
Show Answer
Scratch Pad
Discuss
Correct Answer: Rotameter
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