Discussion
Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
- Question
__________ is undesirable in thermocouples used in industries,
Options- A. Linear relation of emf to temperature
- B. Corrosion resistance
- C. Oxidation resistance
- D. Non-linear relation of emf to temperature
- Correct Answer
- Non-linear relation of emf to temperature
- 1. Typical specifications for design stipulates the gain margin and phase margin to be respectively
Options- A. > 1.7 and > 30°
- B. < 1.7 and > 30°
- C. < 1.7 and < 30°
- D. > 1.7 and < 30° Discuss
- 2. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
Options- A. load
- B. controlled
- C. manipulated
- D. none of these Discuss
- 3. Pick out the one which is a first order instrument.
Options- A. Mercury in glass thermometer (without any covering or air gap).
- B. Bare metallic thermometer.
- C. Bare vapor pressure thermometer.
- D. All (a), (b) and (c). Discuss
- 4. Temperature measuring instruments are standardised mostly with __________ points of pure substances.
Options- A. melting
- B. boiling
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 5. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is
Options- A. 2/s2
- B. 4/s2
- C. 2/s3
- D. 4/s3 Discuss
- 6. Pick out the first order system from among the following.
Options- A. Damped vibrator.
- B. Mercury in glass thermometer kept in boiling water.
- C. Interacting system of two tanks in series.
- D. Non-interacting system of two tanks in series. Discuss
- 7. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.
Options- A. Kelvin
- B. Centigrade
- C. Fahrenheit
- D. Reaumer Discuss
- 8. The function of a transducer is to
Options- A. modify the input signal.
- B. amplify the input signal.
- C. convert the primary signal into a more useful quantity, usually an electric impulse.
- D. codify/decodify the input signal. Discuss
- 9. 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. Discuss
- 10. 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 Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: > 1.7 and > 30°
Correct Answer: manipulated
Correct Answer: All (a), (b) and (c).
Correct Answer: both (a) & (b)
Correct Answer: 4/s3
Correct Answer: Mercury in glass thermometer kept in boiling water.
Correct Answer: Fahrenheit
Correct Answer: convert the primary signal into a more useful quantity, usually an electric impulse.
Correct Answer: iron-constantan
Correct Answer: Peltier effect
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