Discussion
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- Question
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm3.
Options- A. 50
- B. 100
- C. 10
- D. 1
- Correct Answer
- 1
- 1. Time constant is the
Options- A. time taken by the controlled variable to reach 63.2% of its full change.
- B. same as transportation lag.
- C. same as dead time.
- D. time required by the measured variable to reach 63.2% of its ultimate change. Discuss
- 2. Routh stability method uses __________ loop transfer function.
Options- A. open
- B. closed
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
- 3. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
Options- A. chromel-alumel
- B. iron-constantan
- C. platinum-rhodium
- D. platinum-platinum+rhyodium Discuss
- 4. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
Options- A. -38.9
- B. -11.9
- C. -60.9
- D. -80.9 Discuss
- 5. A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
Options- A. helium
- B. hydrogen
- C. nitrogen
- D. none of these Discuss
- 6. Thermal conductivity measurement is used for the determination of
Options- A. O2 percentage in the flue gas.
- B. specific gravity of petrofuels.
- C. composition of an alloy.
- D. CO2 percentage in the flue gas. Discuss
- 7. Emission spectroscopy is used for
Options- A. solids and metal analysis.
- B. determining water purity.
- C. determination of CO2 in gases.
- D. NOxdetermination. Discuss
- 8. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
Options- A. radiation
- B. optical
- C. photoelectric
- D. none of these Discuss
- 9. Characteristic equation is the denominator of __________ loop transfer function.
Options- A. open
- B. closed
- C. both (a)and (b)
- D. neither (a) nor (b) Discuss
- 10. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
Options- A. Nickel
- B. Brass
- C. Chromel
- D. Invar Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: time taken by the controlled variable to reach 63.2% of its full change.
Correct Answer: closed
Correct Answer: iron-constantan
Correct Answer: -38.9
Correct Answer: helium
Correct Answer: CO2 percentage in the flue gas.
Correct Answer: solids and metal analysis.
Correct Answer: photoelectric
Correct Answer: closed
Correct Answer: Brass
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