Dissolved Component Analysers Multiple Choice Questions and Answers

Dissolved Component Analysers Multiple Choice Questions and Answers

1. If the differential amplifier gives a positive output then it infers which of the following (Reference output is given to the positive terminal and sample output is given to the negative terminal)?
a) The concentration of silica in sample and reference solution is equal
b) The concentration of silica in a reference solution is more than that in the sample solution
c) The concentration of silica in sample solution is more than that in the reference solution
d) Further processing is required to come to any conclusion
Answer: The concentration of silica in sample solution is more than that in the reference solution.

2. Which of the following are used to free bound ions or liberate bound ions?
a) Colouring agents
b) Ammonia Buffer
c) Reagents
d) Iodine solution
Answer: Reagents.

3. Which of the following are added for pH adjustment in sodium analyser?
a) Acidic solution
b) Basic solution
c) Hydrazine
d) Ammonia buffer
Answer: Ammonia buffer.

4. Which of the following statements are true?
a) More light is absorbed if the silica content is high in a solution
b) More light is transmitted if the silica content is high in a solution
c) Less light is absorbed if the silica content is high in a solution
d) More light is absorbed if the silica content is low in a solution
Answer: More light is absorbed if the silica content is high in a solution.

5. Which of the following is not added to the sample during analysis during silica analysis?
a) Ammonium Molybdate
b) Sulphuric acid
c) Reducing solution
d) Iodine solution
Answer: Iodine solution.

6. How will the photodetector output be if silica content is high in a solution?
a) The output will be high
b) The output will be low
c) The output will be zero
d) Output cannot be determined
Answer: The output will be low.

7. If the differential amplifier gives zero as output then it infers which of the following (Reference output is given to the positive terminal and sample output is given to the negative terminal)?
a) The concentration of silica in sample and reference solution is equal
b) The concentration of silica in a reference solution is more than that in the sample solution
c) The concentration of silica in sample solution is more than that in the reference solution
d) Further processing is required to come to any conclusion
Answer: The concentration of silica in sample and reference solution is equal.

8. The output from both the detectors is given to which of the following devices?
a) Filters
b) Microprocessor
c) Recorder
d) Differential Amplifier
Answer: Differential Amplifier.

9. Which of the following principles are used in silica analyser?
a) Amperometric principle
b) Colorimetric principle
c) Coulometric principle
d) Magnetic principle
Answer: Colorimetric principle.

10. If the differential amplifier gives a negative output then it infers which of the following (Reference output is given to the positive terminal and sample output is given to the negative terminal)?
a) The concentration of silica in sample and reference solution is equal
b) The concentration of silica in a reference solution is more than that in the sample solution
c) The concentration of silica in sample solution is more than that in the reference solution
d) Further processing is required to come to any conclusion
Answer: The concentration of silica in a reference solution is more than that in the sample solution.

11. In dissolved oxygen analyser, the electrometer consists of which of the following solutions?
a) Calcium hydroxide solution
b) Magnesium hydroxide solution
c) Potassium hydroxide solution
d) Calcium oxide solution
Answer: Potassium hydroxide solution.

12. How does solubility of oxygen in water change with respect to temperature?
a) It decreases with increase in temperature
b) It increases with increase in temperature
c) It decreases with decrease in temperature
d) It does not depend on temperature
Answer: It decreases with increase in temperature.

13. Which of the following represent the concentration of a solution?
a) Only free ions
b) Only bound ions
c) Free ions and bound ions
d) Either free ions or bound ions
Answer: Free ions and bound ions.

14. In which part of the apparatus is the reference and ion selective electrodes placed?
a) Head tank
b) Flow cell
c) Reservoir
d) Solenoid valve
Answer: Flow cell.

15. Which of the following indicate leakages in a condenser?
a) The concentration of sodium in steam and condensate are very high
b) The concentration of sodium in steam and condensate are very low
c) The concentration of sodium in steam and condensate are equal
d) The concentration of sodium in steam and condensate are not equal
Answer: The concentration of sodium in steam and condensate are not equal.

16. The output of the electrode in sodium analyser is proportional to which of the following parameters?
a) Activity
b) Concentration
c) Negative logarithm of sodium ion concentration
d) Logarithm of sodium ion concentration
Answer: Logarithm of sodium ion concentration.

17. Normally, electrodes measure which of the following parameters?
a) Activity
b) Activity co-efficient
c) Blank constant
d) Ionic co-efficient
Answer: Activity.

18. Sodium selective electrode provides a good response in measurement when the pH is above which of the following values?
a) 2
b) 3
c) 5
d) 10
Answer: 10.

19. Which of the following section plays a major role in maintaining the accuracy of the dissolved oxygen analyser?
a) Analysing section
b) Inlet section
c) Transmitting section
d) Condensing section
Answer: Transmitting section.

20. Which of the following transducers must be used for dissolved oxygen analyser?
a) Potentiometric
b) Polarographic
c) Ion-selective electrode
d) Optical transducer
Answer: Polarographic.

21. The water to be analysed flows into the condenser through which of the following components?
a) Filter
b) Semi-permeable membrane
c) Throttling device
d) Platinum filament
Answer: Throttling device.

22. Oxygen content can be controlled by adding which of the following materials with water?
a) Acidic solution
b) Basic solution
c) Iodine
d) Hydrazine
Answer: Hydrazine.

23. What will be the final colour of the solution obtained during silica analysis?
a) Pink
b) Red
c) Blue
d) Yellow
Answer: Blue.

24. Which of the following detectors are used in silica analyser?
a) Photovoltaic cell
b) Photo multiplier
c) Photo emissive tubes
d) Flame emission detector
Answer: Photovoltaic cell.

25. Which of the following bridges are used in dissolved oxygen analyser?
a) Kelvin’s bridge
b) Wheatstone bridge
c) Schering’s bridge
d) Anderson’s bridge
Answer: Wheatstone bridge.

26. Which of the following is the function of the throttling device?
a) Filtering
b) Maintains pH of a water
c) Purifies water
d) Maintains constant flow rate
Answer: Maintains constant flow rate.

27. The dissolved oxygen analyser is based on which of the following meters?
a) Amperometer
b) Katharometer
c) pH meter
d) Voltmeter
Answer: Katharometer.

28. Presence of sodium sulphate in water causes corrosion in boilers.
a) True
b) False
Answer: True

29. Blank use compensates for the effect of temperature variation.
a) True
b) False
Answer: True.

30. In dissolved oxygen analyser, normally more than one condenser is used.
a) True
b) False
Answer: True.

31. Cleaning process gives accuracy and long life.
a) True
b) False
Answer: True.

32. During the first sequence of the process, sample is added at the last.
a) True
b) False
Answer: True.


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