Process Control and Instrumentation problems
- 1. 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
Correct Answer: Fahrenheit
- 2. 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
Correct Answer: convert the primary signal into a more useful quantity, usually an electric impulse.
- 3. 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
Correct Answer: iron-constantan
- 4. 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
Correct Answer: Peltier effect
- 5. 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
Correct Answer: 32°R
- 6. 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
Correct Answer: Time lag
- 7. 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
Correct Answer: Chromel-constantan.
- 8. 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
Correct Answer: P-D controller
- 9. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
Options- A. Peltier effect
- B. Thomson effect
- C. Seebeck effect
- D. none of these Discuss
Correct Answer: Thomson effect
- 10. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
Options- A. insulator
- B. conductor
- C. solid semi-conductor
- D. liquid semi-conductor Discuss
Correct Answer: solid semi-conductor
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