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- Question
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in
Options- A. light intensity
- B. current
- C. flux density
- D. voltage
- Correct Answer
- light intensity
- 1. A system with a double pole at the origin is unstable since the corresponding term in the time domain
Options- A. is a constant.
- B. grows exponentially with time.
- C. grows linearly with time.
- D. decays linearly with time. Discuss
- 2. A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is
Options- A. 45°
- B. -90°
- C. -180°
- D. -45° Discuss
- 3. Emf generated in a thermocouple depends on the temperature
Options- A. of cold junction only.
- B. of hot junction only.
- C. difference between hot and cold junctions.
- D. difference between cold junction and atmospheric temperature. Discuss
- 4. The transfer function of a second order system is
Options- A.
- B.
- C.
- D. none of these Discuss
- 5. Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
Options- A. CO2
- B. N2
- C. O2
- D. CO Discuss
- 6. pH meter has
Options- A. one cell
- B. two cells
- C. three cells
- D. no cell Discuss
- 7. Radiation thermometer can not measure the temperature
Options- A. inside a pressure vessel.
- B. of an object without coming in contact with it.
- C. of liquid oxygen.
- D. of moving objects at high temperature. Discuss
- 8. Thermal wells are used in the temperature measurement to
Options- A. guard against corrosive and oxidising action on thermocouple materials
- B. reduce measuring lag.
- C. increase the fidelity.
- D. increase the sensitivity. Discuss
- 9. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?
Options- A. Platinum-platinum + rhodium
- B. Iron-constantan
- C. Copper-constantan
- D. Chromel-alumel Discuss
- 10. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with
Options- A. air
- B. a metal powder or graphite
- C. oil
- D. mercury Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: grows linearly with time.
Correct Answer: -45°
Correct Answer: difference between hot and cold junctions.
Correct Answer:
Correct Answer: CO2
Correct Answer: two cells
Correct Answer: of liquid oxygen.
Correct Answer: guard against corrosive and oxidising action on thermocouple materials
Correct Answer: Platinum-platinum + rhodium
Correct Answer: air
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