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- Question
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.
- Correct Answer
- both high and low temperatures.
- 1. Pick out the symbol for "locally mounted instrument" in instrumentation diagram.
Options- A.
- B.
- C.
- D.
Discuss
- 2. 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
- 3. 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
- 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
- 5. 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
- 6. Liquid column manometers are used for measuring the pressure __________ kgf/cm2 .
Options- A. > 2(gage)
- B. < 3 (gage)
- C. < 10 (gage)
- D. < atmospheric Discuss
- 7. 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
- 8. 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. Discuss
- 9. Temperature of __________ can not be measured by an optical or radiation pyrometer.
Options- A. hot blast (air) from stoves
- B. molten slag flowing out of blast furnace
- C. combustion space in boilers
- D. rotary limestone calcination kiln Discuss
- 10. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by
Options- A. filling nitrogen under pressure in the stem.
- B. increasing the diameter of the tube.
- C. using steel tube in place of glass tube.
- D. accounting for the tube expansion. Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer:
Correct Answer: 36
Correct Answer: which is of higher magnitude.
Correct Answer: time
Correct Answer: decreases
Correct Answer: < 3 (gage)
Correct Answer: both (a) and (b)
Correct Answer: decay ratio = (overshoot)2
Correct Answer: hot blast (air) from stoves
Correct Answer: filling nitrogen under pressure in the stem.
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