Process Control and Instrumentation problems
- 1. 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 Discuss
Correct Answer: Platinum-platinum/rhodium
- 2. 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 Discuss
Correct Answer: Magnetic flow meter
- 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 Discuss
Correct Answer: decreases
- 4. 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 Discuss
Correct Answer: time
- 5. 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). Discuss
Correct Answer: which is of higher magnitude.
- 6. 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 Discuss
Correct Answer: 36
- 7. Pick out the symbol for "locally mounted instrument" in instrumentation diagram.
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 8. 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. Discuss
Correct Answer: both high and low temperatures.
- 9. Liquid column manometers are used for measuring the pressure __________ kgf/cm2 .
Options- A. > 2(gage)
- B. < 3 (gage)
- C. < 10 (gage)
- D. < atmospheric Discuss
Correct Answer: < 3 (gage)
- 10. 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) Discuss
Correct Answer: both (a) and (b)
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