Discussion
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- Question
"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
- Correct Answer
- Bode stability
- 1. The __________ of a vapor pressure thermometer is a primary element.
Options- A. pointer
- B. Bourdon tube
- C. bulb
- D. none of these Discuss
- 2. 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
- 3. Feed forward controller accounts for the __________ changes.
Options- A. set point
- B. load
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. The fluid used in hydraulic controller is
Options- A. water
- B. steam
- C. air
- D. oil Discuss
- 5. 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
- 6. 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
- 7. A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is
Options- A. 2/s
- B.
- C.
- D.
Discuss
- 8. What is the dynamic error in a critically damped second order instrument for a ramp input (At)?
Options- A. 0.5 AT
- B. 2 AT
- C. AT
- D. 1.5 AT Discuss
- 9. Which of the following is a 'contact' pyrometer?
Options- A. resistance pyrometer
- B. optical pyrometer
- C. radiation pyrometer
- D. infra red pyrometer Discuss
- 10. On-off controllers are normally used for
Options- A. low loads
- B. temperature changes
- C. flow rate changes
- D. none of these Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: bulb
Correct Answer: bimetallic thermometer
Correct Answer: load
Correct Answer: oil
Correct Answer: magnetic flowmeter
Correct Answer: Bourdon gauge
Correct Answer:
Correct Answer: 2 AT
Correct Answer: resistance pyrometer
Correct Answer: low loads
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