Process Control and Instrumentation problems
- 1. 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
Correct Answer: the Laplace transform of integral of exp(at) has finite values only for s > a.
- 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
Correct Answer: strip
- 3. 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
Correct Answer: for which the output response is bounded for all bounded input.
- 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
Correct Answer:
- 5. Bourdon tube is never made of
Options- A. phosphor bronze
- B. monel metal
- C. stainless steel
- D. cast iron Discuss
Correct Answer: cast iron
- 6. 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
Correct Answer: flow rates of fluids.
- 7. 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
Correct Answer: controlled
- 8. 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
Correct Answer: w = 7/6, Kc = 46/3
- 9. 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
Correct Answer: servo problem
- 10. 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
Correct Answer: Mercury thermometer
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