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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Which of the following controllers has the least maximum deviation?
Options
A.
P
-controller
B.
P
-
I
controller
C.
P
-
I
-
D
controller
D.
P
-
D
controller
Correct Answer
P
-
D
controller
Process Control and Instrumentation problems
Search Results
1. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
Options
A. Platinum-platinum + rhodium.
B. Iron-constantan.
C. Chromel-constantan.
D. All will give the same output.
Show Answer
Scratch Pad
Discuss
Correct Answer: Chromel-constantan.
2. Which of the following is an undesirable dynamic characteristic of an instrument?
Options
A. Reproducibility
B. Dead zone
C. Time lag
D. Static error
Show Answer
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Discuss
Correct Answer: Time lag
3. Which of the following is not the triple point of water?
Options
A. 32°R
B. 273°K
C. 492°R
D. 32°F
Show Answer
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Discuss
Correct Answer: 32°R
4. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?
Options
A. Seebeck effect
B. Peltier effect
C. Joule heating effect
D. Thomson effect
Show Answer
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Discuss
Correct Answer: Peltier effect
5. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
Options
A. chromel-alumel
B. iron-constantan
C. platinum-platinum/rhodium
D. none of these.
Show Answer
Scratch Pad
Discuss
Correct Answer: iron-constantan
6. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
Options
A. Peltier effect
B. Thomson effect
C. Seebeck effect
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: Thomson effect
7. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
Options
A. insulator
B. conductor
C. solid semi-conductor
D. liquid semi-conductor
Show Answer
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Discuss
Correct Answer: solid semi-conductor
8. Which of the following is a desirable characteristic of an instrument?
Options
A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility
Show Answer
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Discuss
Correct Answer: High fidelity
9. Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.
Options
A. oxygen in
B. carbon dioxide in
C. carbon monoxide in
D. temperature of
Show Answer
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Discuss
Correct Answer: oxygen in
10. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
Options
A. chromel-alumel
B. iron-constantan
C. platinum-platinum+rhodium
D. either (a), (b) or (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: platinum-platinum+rhodium
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