Discussion
Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
- Question
Thermal wells used in temperature measurements should have
Options- A. very thick walls.
- B. low emissivity.
- C. polished surface.
- D. high transmissivity of radiation.
- Correct Answer
- high transmissivity of radiation.
- 1. Which of the following is not a second order instrument?
Options- A. Mercury in glass thermometer with covering.
- B. Bare mercury in glass thermometer.
- C. Pressure gauge with one bellow, two tubes and a tank.
- D. None of these. Discuss
- 2. Flow rate of sludge is not measured by a/an
Options- A. orificemeter
- B. open weir
- C. kennison nozzle
- D. both(b)&(c) Discuss
- 3. __________ type of element is normally not used in the bimetallic thermometers.
Options- A. Flat spiral
- B. Bourdon tube
- C. Single helix
- D. Multiple helix Discuss
- 4. __________ controller has the maximum stabilising time.
Options- A. P
- B. PD
- C. PI
- D. PID Discuss
- 5. For a feed back control system to be stable, the
Options- A. roots of the characteristic equation should be real.
- B. poles of the closed loop transfer function should lie in the left half of the complex plane.
- C. Bode plots of the corresponding open loop transfer function should monotoni-cally decrease.
- D. poles of the closed loop transfer function should lie in the right half of the complex plane. Discuss
- 6. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.
Options- A. load
- B. manipulated
- C. controlled
- D. none of these Discuss
- 7. Out of the following themocouple wire insulating material, the highest temperature rating is for
Options- A. teflon
- B. ceramic fibre
- C. asbestos
- D. fibre glass Discuss
- 8. Which of following error integral is considered as the best criterion in controller settings?
Options- A.
- B.
- C.
- D. none of these Discuss
- 9. Thermistors are used in __________ devices.
Options- A. voltage measuring
- B. temperature measuring
- C. temperature compensating
- D. both(b)&(c) Discuss
- 10. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to
Options- A. d
- B. d2
- C. d3
- D. d4 Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: Bare mercury in glass thermometer.
Correct Answer: both(b)&(c)
Correct Answer: Bourdon tube
Correct Answer: PI
Correct Answer: poles of the closed loop transfer function should lie in the left half of the complex plane.
Correct Answer: load
Correct Answer: ceramic fibre
Correct Answer:
Correct Answer: both(b)&(c)
Correct Answer: d4
Comments
There are no comments.More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.