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Chemical Technician (Analytical Chemistry) > Dissolved Component Analysers > Flashcards

Dissolved Component Analysers Flashcards

1
Q
  1. Which of the following transducers must be used for
    dissolved oxygen analyser?
    a) Potentiometric
    b) Polarographic
    c) Ion-selective electrode
    d) Optical transducer
A

b) Polarographic

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2
Q
  1. 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

a) It decreases with increase in temperature

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3
Q
  1. Oxygen content can be controlled by adding which of the following materials with water?
    a) Acidic solution
    b) Basic solution
    c) Iodine
    d) Hydrazine
A

d) Hydrazine

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4
Q
  1. 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
A

c) Throttling device

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5
Q
  1. 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
A

b) Wheatstone bridge

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6
Q
  1. 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
A

d) Maintains constant flow rate

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7
Q
  1. 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
A

c) Transmitting section

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8
Q
  1. The dissolved oxygen analyser is based on which of the
    following meters?
    a) Amperometer
    b) Katharometer
    c) pH meter
    d) Voltmeter
A

b) Katharometer

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9
Q
  1. 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
A

c) Potassium hydroxide solution

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10
Q
  1. In dissolved oxygen analyser, normally more than one condenser is used.
    a) True
    b) False
A

a) True

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11
Q
  1. 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
A

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

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12
Q
  1. Normally, electrodes measure which of the following parameters?
    a) Activity
    b) Activity co-efficient
    c) Blank constant
    d) Ionic co-efficient
A

a) Activity

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12
Q
  1. Which of the following are added for pH adjustment in sodium analyser?
    a) Acidic solution
    b) Basic solution
    c) Hydrazine
    d) Ammonia buffer
A

d) Ammonia buffer

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13
Q
  1. 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
A

c) Free ions and bound ions

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14
Q
  1. 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
A

d) 10

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15
Q
  1. 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
A

c) Reagents

16
Q
  1. 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
A

b) Flow cell

17
Q
  1. 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
A

d) Logarithm of sodium ion concentration

17
Q
  1. Cleaning process gives accuracy and long life.
    a) True
    b) False
18
Q
  1. Presence of sodium sulphate in water causes corrosion in boilers.
    a) True
    b) False
19
Q
  1. Which of the following principles are used in silica
    analyser?
    a) Amperometric principle
    b) Colorimetric principle
    c) Coulometric principle
    d) Magnetic principle
A

b) Colorimetric principle

20
Q
  1. The output from both the detectors is given to which of the following devices?
    a) Filters
    b) Microprocessor
    c) Recorder
    d) Differential Amplifier
A

d) Differential Amplifier

21
Q
  1. 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
A

d) Iodine solution

22
Q
  1. 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

a) Photovoltaic cell

23
Q
  1. 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
A

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

24
Q
  1. 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

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

25
Q
  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
A

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

26
Q
  1. 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

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

27
Q
  1. 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
A

b) The output will be low

28
Q
  1. What will be the final colour of the solution obtained
    during silica analysis?
    a) Pink
    b) Red
    c) Blue
    d) Yellow
29
Q
  1. Blank use compensates for the effect of temperature variation.
    a) True
    b) False
29
Q
  1. During the first sequence of the process, sample is
    added at the last.
    a) True
    b) False

Chemical Technician (Analytical Chemistry) (16 decks)

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