Discussion
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- Question
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
- Correct Answer
- 1
- 1. 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
- 2. 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
- 3. 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
- 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
- 5. Flame photometry is used for the determination of compositional analysis of
Options- A. solids
- B. alkali metals
- C. natural gas
- D. isotopes Discuss
- 6. 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
- 7. 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
- 8. Dome temperature of blast furnace stove is most accurately measured by a
Options- A. radiation pyrometer.
- B. platinum-platinum/rhodium ther-mocuple.
- C. iron-constantan thermocouple.
- D. platinum resistance thermometer. Discuss
- 9. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
Options- A. 250
- B. 350
- C. 550
- D. 700 Discuss
- 10. A manometer measures the __________ pressure.
Options- A. atmospheric
- B. absolute
- C. gauge
- D. none of these Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: Hot wire anemometer
Correct Answer: 0° & 80°
Correct Answer: reciprocal of amplitude ratio
Correct Answer: Thermocouples
Correct Answer: alkali metals
Correct Answer: - 39 and 350
Correct Answer: Radiation pyrometer
Correct Answer: platinum-platinum/rhodium ther-mocuple.
Correct Answer: 550
Correct Answer: gauge
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