Discussion
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- Question
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.
- Correct Answer
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- 1. 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
- 2. The pressure sensing element of elastic type pressure gauge is never made in the form of a
Options- A. bellow
- B. diaphragm
- C. strip
- D. Bourdon tube Discuss
- 3. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
Options- A. the function is exponential.
- B. the Laplace transform of integral of exp(at) has finite values only for s > a.
- C. the Laplace transform integral of exp(at) has initial values only for s > a.
- D. the function exp(at) is piece-wise continuous only for s > a. Discuss
- 4. Photoelectric pyrometers are suitable in the temperature range of __________ °C.
Options- A. 400-1600
- B. 800-1600
- C. 800-2500
- D. 400-1000 Discuss
- 5. Which of the following thermocouples is capable of measuring a temperature of -50°C?
Options- A. Platinum - platinum + rhodium
- B. Chromel - alumel
- C. Iron-constantan
- D. Copper - constantan Discuss
- 6. Bourdon tube is never made of
Options- A. phosphor bronze
- B. monel metal
- C. stainless steel
- D. cast iron Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Process Control and Instrumentation problems
Search Results
Correct Answer: for which the output response is bounded for all bounded input.
Correct Answer: strip
Correct Answer: the Laplace transform of integral of exp(at) has finite values only for s > a.
Correct Answer: 800-1600
Correct Answer: Platinum - platinum + rhodium
Correct Answer: cast iron
Correct Answer: flow rates of fluids.
Correct Answer: controlled
Correct Answer: w = 7/6, Kc = 46/3
Correct Answer: servo problem
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