Dissolved Component Analysers Flashcards by Khristine Tapado

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

b) Polarographic

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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

a) It decreases with increase in temperature

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

d) Hydrazine

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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

c) Throttling device

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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

b) Wheatstone bridge

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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

d) Maintains constant flow rate

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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

c) Transmitting section

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

b) Katharometer

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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

c) Potassium hydroxide solution

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

a) True

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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

d) The concentration of sodium in steam and condensate are not equal

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

a) Activity

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

d) Ammonia buffer

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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

c) Free ions and bound ions

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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

d) 10

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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

c) Reagents

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

b) Flow cell

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

d) Logarithm of sodium ion concentration

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

a) True

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

a) True

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

b) Colorimetric principle

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

d) Differential Amplifier

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

d) Iodine solution

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

a) Photovoltaic cell

7. 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

b) The concentration of silica in a reference solution is more than that in the sample solution

5. 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

a) The concentration of silica in sample and reference solution is equal

6. 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

c) The concentration of silica in sample solution is more than that in the reference solution

8. 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

a) More light is absorbed if the silica content is high in a solution

9. 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

b) The output will be low

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

c) Blue

12. Blank use compensates for the effect of temperature variation. a) True b) False

a) True

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

a) True