Discussion
Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
- Question
Response of a linear control system for a change in set point is called
Options- A. frequency response
- B. transient response
- C. servo problem
- D. regulator problem
- Correct Answer
- servo problem
- 1. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).
Options- A. w = 1/14, Kc = 45/714
- B. w = 7/6, Kc = 46/3
- C. w = 1, Kc = 13
- D. w = 7/8, Kc = 45/4 Discuss
- 2. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.
Options- A. load
- B. manipulated
- C. controlled
- D. none of these Discuss
- 3. Hot wire anemometer is used for the measurement of
Options- A. flow rates of fluids.
- B. flow rates of granular solids.
- C. very high temperature.
- D. thermal conductivity of gases. Discuss
- 4. Bourdon tube is never made of
Options- A. phosphor bronze
- B. monel metal
- C. stainless steel
- D. cast iron Discuss
- 5. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is
Options- A.
- B.
- C.
- D.
Discuss
- 6. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?
Options- A. Mercury thermometer
- B. Radiation pyrometer
- C. Bimetallic thermometer
- D. Thermocouple Discuss
- 7. Cascade control means
Options- A. feed forward control.
- B. more than one feed-back loop.
- C. on-off control.
- D. one feed-back loop. Discuss
- 8. Meleoid gauge measures the __________ pressure.
Options- A. positive
- B. sub-atmospheric
- C. very high
- D. atmospheric Discuss
- 9. Phase margin is equal to
Options- A. 180° - phase lag
- B. phase lag - 180°
- C. phase lag + 180°
- D. phase lag + 90° Discuss
- 10. Maximum differential pressure in liquid manometer is __________ psi.
Options- A. 20
- B. 30
- C. 40
- D. 50 Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: w = 7/6, Kc = 46/3
Correct Answer: controlled
Correct Answer: flow rates of fluids.
Correct Answer: cast iron
Correct Answer:
Correct Answer: Mercury thermometer
Correct Answer: more than one feed-back loop.
Correct Answer: sub-atmospheric
Correct Answer: 180° - phase lag
Correct Answer: 30
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