Discussion
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- Question
Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop.
Options- A. Tank 1
- B. Tank 2
- C. Tank 3
- D. Tank 4
- Correct Answer
- Tank 3
- 1. Liquid flow rate in an open channel can not be measured by a/an
Options- A. orifice meter
- B. cipolletti weir
- C. rectangular weir
- D. V-notch Discuss
- 2. Which of the following is not classified as a thermo electric pyrometer?
Options- A. Resistance thermometer.
- B. Thermocouple.
- C. Optical pyrometer (disappearing filament type)
- D. Radiation pyrometer Discuss
- 3. What is the Laplace transform of impulse input having magnitude 'X'?
Options- A. X
- B. X2
- C. 1/X
- D. 1 Discuss
- 4. Maximum differential pressure in liquid manometer is __________ psi.
Options- A. 20
- B. 30
- C. 40
- D. 50 Discuss
- 5. Phase margin is equal to
Options- A. 180° - phase lag
- B. phase lag - 180°
- C. phase lag + 180°
- D. phase lag + 90° Discuss
- 6. Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?
Options- A. Mercury in glass thermometer.
- B. Alcohol in glass thermometer.
- C. Fused metal (Na or K) in steel thermometer.
- D. Nitrogen in steel thermometer. Discuss
- 7. Non-metallic diaphragm used as pressure sensor in instruments is generally made of
Options- A. teflon
- B. synthetic rubber
- C. bakelite
- D. thick paper Discuss
- 8. Which of the following thermocouples has the widest temperature measurement range?
Options- A. Iron-constantan
- B. Chromel-alumel
- C. Copper-constantan
- D. Platinum-platinum/rhodium Discuss
- 9. Which of the following is not a variable area flow meter?
Options- A. Piston type meter
- B. Rotameter
- C. Magnetic flow meter
- D. Orifice and tapered plug meter Discuss
- 10. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
Options- A. increases
- B. decreases
- C. remains constant
- D. increases exponentially Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: orifice meter
Correct Answer: Optical pyrometer (disappearing filament type)
Correct Answer: 1
Correct Answer: 30
Correct Answer: 180° - phase lag
Correct Answer: Alcohol in glass thermometer.
Correct Answer: synthetic rubber
Correct Answer: Platinum-platinum/rhodium
Correct Answer: Magnetic flow meter
Correct Answer: decreases
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