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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Time constant is the
Options
A. time taken by the controlled variable to reach 63.2% of its full change.
B. same as transportation lag.
C. same as dead time.
D. time required by the measured variable to reach 63.2% of its ultimate change.
Correct Answer
time taken by the controlled variable to reach 63.2% of its full change.
Process Control and Instrumentation problems
Search Results
1. Routh stability method uses __________ loop transfer function.
Options
A. open
B. closed
C. either (a) or (b)
D. neither (a) nor (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: closed
2. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
Options
A. chromel-alumel
B. iron-constantan
C. platinum-rhodium
D. platinum-platinum+rhyodium
Show Answer
Scratch Pad
Discuss
Correct Answer: iron-constantan
3. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
Options
A. -38.9
B. -11.9
C. -60.9
D. -80.9
Show Answer
Scratch Pad
Discuss
Correct Answer: -38.9
4. A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
Options
A. helium
B. hydrogen
C. nitrogen
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: helium
5. Composition of alloys can be determined by
Options
A. polarograph
B. chromatograph
C. refractrometer
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: polarograph
6. Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm
3
.
Options
A. 50
B. 100
C. 10
D. 1
Show Answer
Scratch Pad
Discuss
Correct Answer: 1
7. Thermal conductivity measurement is used for the determination of
Options
A. O
2
percentage in the flue gas.
B. specific gravity of petrofuels.
C. composition of an alloy.
D. CO
2
percentage in the flue gas.
Show Answer
Scratch Pad
Discuss
Correct Answer: CO
2
percentage in the flue gas.
8. Emission spectroscopy is used for
Options
A. solids and metal analysis.
B. determining water purity.
C. determination of CO
2
in gases.
D. NO
x
determination.
Show Answer
Scratch Pad
Discuss
Correct Answer: solids and metal analysis.
9. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
Options
A. radiation
B. optical
C. photoelectric
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: photoelectric
10. Characteristic equation is the denominator of __________ loop transfer function.
Options
A. open
B. closed
C. both (a)and (b)
D. neither (a) nor (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: closed
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