Discussion
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- Question
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.
- Correct Answer
- iron-constantan
- 1. 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
- 2. 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
- 3. 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
- 4. __________ 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 Discuss
- 5. 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
- 6. 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
- 7. Which of the following is not the triple point of water?
Options- A. 32°R
- B. 273°K
- C. 492°R
- D. 32°F Discuss
- 8. Which of the following is an undesirable dynamic characteristic of an instrument?
Options- A. Reproducibility
- B. Dead zone
- C. Time lag
- D. Static error Discuss
- 9. 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. Discuss
- 10. 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 Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: convert the primary signal into a more useful quantity, usually an electric impulse.
Correct Answer: Fahrenheit
Correct Answer: Mercury in glass thermometer kept in boiling water.
Correct Answer: Non-linear relation of emf to temperature
Correct Answer: > 1.7 and > 30°
Correct Answer: Peltier effect
Correct Answer: 32°R
Correct Answer: Time lag
Correct Answer: Chromel-constantan.
Correct Answer: P-D controller
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