Discussion
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- Question
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
- Correct Answer
- RC
- 1. 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
- 2. 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
- 3. Thermistors are made of
Options- A. ultra pure metals
- B. metal oxides
- C. iron-copper alloys
- D. nickel-chromium alloys Discuss
- 4. Gas chromatography is used for the measurement of
Options- A. temperature
- B. pressure
- C. concentration
- D. flow rate Discuss
- 5. Which of the following thermocouples can measure the maximum temperature?
Options- A. Platinum-rhodium
- B. Tungsten-molybdenum
- C. Chromel-alumel
- D. Iron-constantan Discuss
- 6. 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
- 7. 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
- 8. Which of the following thermocouple materials does not contain nickel?
Options- A. Alumel
- B. Chromel
- C. Constantan
- D. None of these. Discuss
- 9. The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is
Options- A. 0
- B. 1/2
- C. 1
- D. 2 Discuss
- 10. Which of the following thermometers is not suitable for distant reading upto 60 metres?
Options- A. Vapor pressure thermometer
- B. Mercury in glass thermometer
- C. Constant volume gas thermometer
- D. Resistance thermometer Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: log (AR) vs. log (f) and (?) vs. log (f).
Correct Answer: underdamped response.
Correct Answer: metal oxides
Correct Answer: concentration
Correct Answer: Tungsten-molybdenum
Correct Answer: non-isothermal CSTR
Correct Answer: object and surrounding are at almost the same temperature.
Correct Answer: None of these.
Correct Answer: 1/2
Correct Answer: Mercury in glass thermometer
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