Process Control and Instrumentation problems
- 1. Which of the following flow-metering instru-ments is an areameter?
Options- A. Venturimeter
- B. Rotameter
- C. Pitot tube
- D. Hot wire anemometer Discuss
Correct Answer: Rotameter
- 2. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the
Options- A. mercury in glass thermometer.
- B. optical pyrometer.
- C. iron-constantan thermocouple.
- D. alcohol filled thermometer. Discuss
Correct Answer: optical pyrometer.
- 3. Thermal conductivity cell is the primary element of a/an __________ analyser.
Options- A. oxygen
- B. carbon dioxide
- C. carbon monoxide
- D. sulphur dioxide Discuss
Correct Answer: carbon dioxide
- 4. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
Options- A. water
- B. carbon tetrachloride
- C. paraffin
- D. ethylene glycol Discuss
Correct Answer: paraffin
- 5. Presence of a small amount of water in the organic systems can be determined by the __________ method.
Options- A. electrical conductivity
- B. polarimetry
- C. emission spectroscopy
- D. dielectric constant end loss factor Discuss
Correct Answer: dielectric constant end loss factor
- 6. The open loop transfer function of a control system is
. This represents
Options- A. a first order system.
- B. dead time system.
- C. a first order time lag.
- D. a second order system. Discuss
Correct Answer: a first order system.
- 7. __________ is the static characteristics of an instrument,
Options- A. Response
- B. Tine lag
- C. Drift
- D. dynamic error Discuss
Correct Answer: Drift
- 8. A pyrheliometer is an instrument used for measuring the
Options- A. bright sunshine period.
- B. beam radiation.
- C. diffuse radiation.
- D. none of these. Discuss
Correct Answer: beam radiation.
- 9. A simple pitot tube measures the
Options- A. average velocity
- B. maximum velocity
- C. point velocity
- D. static pressure Discuss
Correct Answer: static pressure
- 10. Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature
Options- A. emf produced is very low of the order of microvolt.
- B. embrittlement of iron occurs.
- C. rusting of iron takes place.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
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