Process Control and Instrumentation problems
- 1. If response of a control system is to be free of offset and oscillation, the most suitable controller is
Options- A. proportional controller.
- B. proportional-derivative(PD)controller.
- C. proportional-integral (PI) controller.
- D. proportional integral-derivative (PID) controller. Discuss
Correct Answer: proportional integral-derivative (PID) controller.
- 2. Conversion formula for converting amplitude ratio (AR) into decibels is
Options- A. Decibel = 20 log10 (AR)
- B. Decibel = 20 loge (AR)
- C. Decibel = 20 log10 (AR)0.5
- D. Decibel = 20 loge (AR)0.5 Discuss
Correct Answer: Decibel = 20 log10 (AR)
- 3. Flame photometry is used for the determination of compositional analysis of
Options- A. solids
- B. alkali metals
- C. natural gas
- D. isotopes Discuss
Correct Answer: alkali metals
- 4. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?
Options- A. Optical pyrometer
- B. Radiation pyrometer
- C. Photoelectric pyrometer
- D. Thermocouples Discuss
Correct Answer: Thermocouples
- 5. Gain margin is equal to the
Options- A. amplitude ratio
- B. reciprocal of amplitude ratio
- C. gain in P controller
- D. gain in P-I controller Discuss
Correct Answer: reciprocal of amplitude ratio
- 6. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively
Options- A. - 273° & 80°
- B. 0° & 80°
- C. 32° & 460°
- D. 32° & 80° Discuss
Correct Answer: 0° & 80°
- 7. Which of the following is not a composition measuring instrument?
Options- A. Thermal conductivity cell
- B. Mass spectrometer
- C. Polarograph
- D. Hot wire anemometer Discuss
Correct Answer: Hot wire anemometer
- 8. A control system has the following transfer function
The initial value of the corresponding time function is
Options- A. 1
- B. 1/8
- C. 7/8
- D. -1 Discuss
Correct Answer: 1
- 9. Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
Options- A. - 39 and 350
- B. - 51 and 439
- C. - 79 and 395
- D. - 10 and 425 Discuss
Correct Answer: - 39 and 350
- 10. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?
Options- A. Platinum resistance thermometer
- B. Mercury in glass thermometer
- C. Vapor pressure thermometer
- D. Radiation pyrometer Discuss
Correct Answer: Radiation pyrometer
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