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Process Control and Instrumentation
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Question
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is
Options
A. 12
B. 36
C. 54
D. 68
Correct Answer
36
Process Control and Instrumentation problems
Search Results
1. Pyrometry refers to the measurement of temperature
Options
A. with the mercurial thermometer upto 350°C.
B. directly.
C. which is of higher magnitude.
D. all (a), (b) & (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: which is of higher magnitude.
2. The unit of 'time constant' of a system is the same as that of
Options
A. velocity
B. time
C. (time)
-1
D. none of these
Show Answer
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Discuss
Correct Answer: time
3. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
Options
A. increases
B. decreases
C. remains constant
D. increases exponentially
Show Answer
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Discuss
Correct Answer: decreases
4. Which of the following is not a variable area flow meter?
Options
A. Piston type meter
B. Rotameter
C. Magnetic flow meter
D. Orifice and tapered plug meter
Show Answer
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Discuss
Correct Answer: Magnetic flow meter
5. Which of the following thermocouples has the widest temperature measurement range?
Options
A. Iron-constantan
B. Chromel-alumel
C. Copper-constantan
D. Platinum-platinum/rhodium
Show Answer
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Discuss
Correct Answer: Platinum-platinum/rhodium
6. Pick out the symbol for "locally mounted instrument" in instrumentation diagram.
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
7. Thermocouple is suitable for measuring
Options
A. liquid temperatures only.
B. very high temperatures only.
C. very low temperatures only.
D. both high and low temperatures.
Show Answer
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Discuss
Correct Answer: both high and low temperatures.
8. Liquid column manometers are used for measuring the pressure __________ kgf/cm
2
.
Options
A. > 2(gage)
B. < 3 (gage)
C. < 10 (gage)
D. < atmospheric
Show Answer
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Discuss
Correct Answer: < 3 (gage)
9. Platinum resistance thermometer is the international standard for temperature measurement between
Options
A. triple point of hydrogen and freezing point of antimony
B. 13.81°K to 903.9°K
C. both (a) and (b)
D. neither (a) nor (b)
Show Answer
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Discuss
Correct Answer: both (a) and (b)
10. In second order underdamped system,
Options
A. decay ratio = overshoot
B. decay ratio = (overshoot)
2
C. overshoot increases for increasing damping co-efficient.
D. large damping co-efficient means smaller damping.
Show Answer
Scratch Pad
Discuss
Correct Answer: decay ratio = (overshoot)
2
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