Discussion
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- Question
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
- Correct Answer
- w = 7/6, Kc = 46/3
- 1. 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
- 2. 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
- 3. Bourdon tube is never made of
Options- A. phosphor bronze
- B. monel metal
- C. stainless steel
- D. cast iron Discuss
- 4. 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
- 5. A stable system is the one
Options- A. for which the output response is bounded for all bounded input.
- B. which exhibits an unbounded response to a bounded input
- C. which satisfies the conditions for a servo problem.
- D. none of these. Discuss
- 6. 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 Discuss
- 7. 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
- 8. 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
- 9. Meleoid gauge measures the __________ pressure.
Options- A. positive
- B. sub-atmospheric
- C. very high
- D. atmospheric Discuss
- 10. Phase margin is equal to
Options- A. 180° - phase lag
- B. phase lag - 180°
- C. phase lag + 180°
- D. phase lag + 90° Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: controlled
Correct Answer: flow rates of fluids.
Correct Answer: cast iron
Correct Answer:
Correct Answer: for which the output response is bounded for all bounded input.
Correct Answer: servo problem
Correct Answer: Mercury thermometer
Correct Answer: more than one feed-back loop.
Correct Answer: sub-atmospheric
Correct Answer: 180° - phase lag
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