Process Control and Instrumentation problems
- 1. Stability of a control system containing a transportation lag can be best analysed by
Options- A. Routh test
- B. root locus methods
- C. frequency response methods
- D. none of these Discuss
Correct Answer: frequency response methods
- 2. When a bare thermocouple is covered by a protective sheath, the response becomes
Options- A. faster and oscillatory.
- B. faster and non-oscillatory.
- C. slower and oscillatory.
- D. slower and non-oscillatory. Discuss
Correct Answer: slower and non-oscillatory.
- 3. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by
Options- A. making the volume of thermometer bulb as large as conveniently possible.
- B. reducing the volume of the capillary to a minimum.
- C. reducing the volume of the receiving element to a minimum.
- D. all 'a', 'b' & 'c'. Discuss
Correct Answer: all 'a', 'b' & 'c'.
- 4. Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.
Options- A. antimony
- B. gold
- C. silver
- D. nickel Discuss
Correct Answer: gold
- 5. Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.
Options- A. 63.2
- B. 87.5
- C. 95
- D. 100 Discuss
Correct Answer: 95
- 6. Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.
Options- A. increase of pressure
- B. increase of thermal conductivity
- C. volumetric expansion
- D. differential linear expansion Discuss
Correct Answer: volumetric expansion
- 7. The open loop transfer function of a process is
. In the root locus diagram, the poles will be at
Options- A. -1, -4
- B. 1, 4
- C. -2, -3
- D. 2, 3 Discuss
Correct Answer: -2, -3
- 8. Composition of alloys can be determined by
Options- A. polarograph
- B. chromatograph
- C. refractrometer
- D. none of these Discuss
Correct Answer: polarograph
- 9. A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
Options- A. helium
- B. hydrogen
- C. nitrogen
- D. none of these Discuss
Correct Answer: helium
- 10. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
Options- A. -38.9
- B. -11.9
- C. -60.9
- D. -80.9 Discuss
Correct Answer: -38.9
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