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- Question
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.
- Correct Answer
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- 1. 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
- 2. "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
- 3. The __________ of a vapor pressure thermometer is a primary element.
Options- A. pointer
- B. Bourdon tube
- C. bulb
- D. none of these Discuss
- 4. 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
- 5. Feed forward controller accounts for the __________ changes.
Options- A. set point
- B. load
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 6. 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
- 7. Which of the following is a 'contact' pyrometer?
Options- A. resistance pyrometer
- B. optical pyrometer
- C. radiation pyrometer
- D. infra red pyrometer Discuss
- 8. On-off controllers are normally used for
Options- A. low loads
- B. temperature changes
- C. flow rate changes
- D. none of these Discuss
- 9. Pressure of 0.01 psi (absolute) can be measured by __________ gauge.
Options- A. ionisation
- B. Pirani
- C. Mcloid
- D. none of these Discuss
- 10. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
Options- A. large area but small mass.
- B. high thermal conductivity.
- C. small specific heat.
- D. all'a', 'b' & 'c'. Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: Bourdon gauge
Correct Answer: Bode stability
Correct Answer: bulb
Correct Answer: bimetallic thermometer
Correct Answer: load
Correct Answer: 2 AT
Correct Answer: resistance pyrometer
Correct Answer: low loads
Correct Answer: Mcloid
Correct Answer: all'a', 'b' & 'c'.
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