Discussion
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- Question
Block diagram of a simple standard control system is shown below in the figure.
Which of the following statement about the above control system is wrong?
Options- A. The transfer functions of the measuring element and the process is represent by H and G2 respectively
- B. The overall transfer function for the change in load (X = 0) is given by
- C. The overall transfer function for the change in set point (X1 = 0) is given by
- D. Manipulated variable is represented by C.
- Correct Answer
- Manipulated variable is represented by C.
- 1. Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.
Options- A. 961.93
- B. 630.74
- C. 1064.43
- D. 1261.93 Discuss
- 2. Silver point temperature is __________ °C.
Options- A. 760.5
- B. 860.5
- C. 960.5
- D. 1060.5 Discuss
- 3. "An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a
Options- A. pH meter
- B. polarimeter
- C. chromatograph
- D. polarograph Discuss
- 4. __________ is an example of distributed parameter system
Options- A. Tubular reactor
- B. CSTR
- C. On-off controller
- D. none of these Discuss
- 5. Which of the following is never used as an element of industrial resistance thermometer?
Options- A. Lead
- B. Nickel
- C. Copper
- D. 30% iron + 70% nickel Discuss
- 6. Bimetal strips are not used in
Options- A. bimetallic thermometers.
- B. thermocouples.
- C. thermostats.
- D. relays for opening & closing of electrical circuits. Discuss
- 7. Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
Options- A. air to open valve with the controller direct acting.
- B. air to close valve with the controller indirect acting.
- C. air to open valve with the controller indirect acting.
- D. air to close valve with the controller direct acting. Discuss
- 8. Mcleoid gauge is used to measure the
Options- A. point velocity
- B. flow rate
- C. vacuum
- D. pressure Discuss
- 9. A non-linear system will have __________ steady state values.
Options- A. one
- B. more than one
- C. two
- D. three Discuss
- 10. 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
Process Control and Instrumentation problems
Search Results
Correct Answer: 630.74
Correct Answer: 960.5
Correct Answer: pH meter
Correct Answer: Tubular reactor
Correct Answer: Lead
Correct Answer: thermocouples.
Correct Answer: air to open valve with the controller indirect acting.
Correct Answer: vacuum
Correct Answer: more than one
Correct Answer: Platinum - platinum + rhodium
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