Process Control and Instrumentation problems
- 1. Which is the most suitable instrument for measuring pressure below 3 microns?
Options- A. Mcleoid gauge
- B. Alphatron
- C. Ionisation gauge
- D. Bourdon guage Discuss
Correct Answer: Ionisation gauge
- 2. Polarisation of light forms the working principle of a
Options- A. polarimeter
- B. polarograph
- C. chromatograph
- D. spectrometer Discuss
Correct Answer: polarimeter
- 3. Working principle of radiation pyrometer is based on the
Options- A. Wien's law
- B. Kirchoffs law
- C. stefan-Boltzman law
- D. Seebeck effect Discuss
Correct Answer: stefan-Boltzman law
- 4. Flow rate through an orifice is __________ the pressure differential.
Options- A. proportional to
- B. inversely proportional to the square root of
- C. proportional to the square root of
- D. inversely proportional to the square of Discuss
Correct Answer: proportional to the square root of
- 5. Bode stability method uses __________ loop transfer function.
Options- A. open
- B. closed
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
Correct Answer: open
- 6. Dead zone in an instrument must be less than __________ percent of the scale.
Options- A. 0.2
- B. 1.5
- C. 4
- D. 8 Discuss
Correct Answer: 0.2
- 7. Liquid levels in autocalves are measued by
Options- A. simple float
- B. differential float type manometer
- C. glass gauge
- D. none of these Discuss
Correct Answer: differential float type manometer
- 8. Process degree of freedom indicates __________ number of controllers to be used.
Options- A. the maximum
- B. the minimum
- C. both maximum and the minimum
- D. nothing about the Discuss
Correct Answer: the maximum
- 9. The transfer function of a pure dead time system with dead time ?d is
Options- A. 1/(?ds + 1)
- B. ?ds + 1
- C. e-?ss
- D. e?ds Discuss
Correct Answer: e-?ss
- 10. Gas analysis is commonly done using the
Options- A. thermal conductivity cell
- B. X-ray diffraction
- C. mass spectrometer
- D. emission spectrometer Discuss
Correct Answer: thermal conductivity cell
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