Discussion
Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
- Question
The fluid used in hydraulic controller is
Options- A. water
- B. steam
- C. air
- D. oil
- Correct Answer
- oil
- 1. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a
Options- A. magnetic flowmeter
- B. pitot tube
- C. flow nozzle type flowmeter
- D. turbine flowmeter Discuss
- 2. According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is
Options- A. 0°
- B. 45°
- C. 90°
- D. 180° Discuss
- 3. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)
Options- A.
- B.
- C.
- D.
Discuss
- 4. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.
Options- A. Peltier
- B. Thomson
- C. Seebeck
- D. none of these Discuss
- 5. Thermocouple in a thermal well behaves as a true
Options- A. first order system.
- B. second order system (overdamped).
- C. multiple first order system.
- D. second order system (underdamped). Discuss
- 6. Feed forward controller accounts for the __________ changes.
Options- A. set point
- B. load
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 7. Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.
Options- A. mercury thermometer
- B. bimetallic thermometer
- C. radiation pyrometer
- D. none of these Discuss
- 8. The __________ of a vapor pressure thermometer is a primary element.
Options- A. pointer
- B. Bourdon tube
- C. bulb
- D. none of these Discuss
- 9. "A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.
Options- A. Bode stability
- B. Nyquist
- C. Routh stability
- D. none of these Discuss
- 10. Measurement of pressure in ammonia reactor is done by
Options- A. Bourdon gauge
- B. U-tube manometer
- C. Inclined tube manometer
- D. Pirani guage Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: magnetic flowmeter
Correct Answer: 180°
Correct Answer:
Correct Answer: Peltier
Correct Answer: multiple first order system.
Correct Answer: load
Correct Answer: bimetallic thermometer
Correct Answer: bulb
Correct Answer: Bode stability
Correct Answer: Bourdon gauge
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