Process Control and Instrumentation problems
- 1. Dead zone is the
Options- A. same as time constant.
- B. same as transportation lag.
- C. maximum change in the variable that does not change the reading of the instrument.
- D. none of these. Discuss
Correct Answer: maximum change in the variable that does not change the reading of the instrument.
- 2. Which thermocouple can be used to measure a temperature of around 1400°C?
Options- A. Copper-constantan
- B. Aluminium-chromel
- C. Platinum-platinum+rhodium
- D. None of these Discuss
Correct Answer: Platinum-platinum+rhodium
- 3. Which of the following thermocouples can measure the maximum temperature?
Options- A. Platinum-rhodium
- B. Tungsten-molybdenum
- C. Chromel-alumel
- D. Iron-constantan Discuss
Correct Answer: Tungsten-molybdenum
- 4. Gas chromatography is used for the measurement of
Options- A. temperature
- B. pressure
- C. concentration
- D. flow rate Discuss
Correct Answer: concentration
- 5. Thermistors are made of
Options- A. ultra pure metals
- B. metal oxides
- C. iron-copper alloys
- D. nickel-chromium alloys Discuss
Correct Answer: metal oxides
- 6. In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit
Options- A. overdamped response.
- B. underdamped response.
- C. undamped response.
- D. unstable response. Discuss
Correct Answer: underdamped response.
- 7. Bode diagram is a plot of
Options- A. log (AR) vs. log (f) and (?) vs. log (f).
- B. log (AR) vs. f and log ? vs.f.
- C. AR vs. log (f) and ? vs. log (f).
- D. none of these. Discuss
Correct Answer: log (AR) vs. log (f) and (?) vs. log (f).
- 8. The time constant of a first order process with resistance R and capacitance C is
Options- A. R + C
- B. R - C
- C. RC
- D. 1/RC Discuss
Correct Answer: RC
- 9. A non-linear chemical system is exemplified by a/an
Options- A. isothermal CSTR
- B. mixer
- C. non-isothermal CSTR
- D. none of these Discuss
Correct Answer: non-isothermal CSTR
- 10. Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the
Options- A. enhancement or attentuation of redia-tion occurs in the sighting path.
- B. object and surrounding are at almost the same temperature.
- C. object has varying emissivity.
- D. object is transparent. Discuss
Correct Answer: object and surrounding are at almost the same temperature.
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