Pollution Monitoring Instruments Flashcards
1
Q
- In West-Gaeke colourimetric procedure, the intensity of the red purple colour is measured photometically and it is proportional to the concentration of sulphur dioxide. What is the red purple coloured compound?
a) Sodium tetra chloromercurate
b) Dicholorosulphitomercurate complex
c) Ammonia molybdate
d) Paraosaniline sulphonic acid
A
d) Paraosaniline sulphonic acid
2
Q
- The conductivitimetry method, involves bubbling
sulphur dioxide through a solution containing sulphuric
acid and which of the following?
a) Water
b) Hydrogen peroxide
c) Iodine
d) Formaldehyde
A
b) Hydrogen peroxide
3
Q
- Which of the following is not true about using gas
chromatography for measuring pollutants in the air?
a) Pollutants react rapidly in the column
b) Pollutants may not be detected by the detectors
c) Special column and support materials are required
d) Pollutants may elude rapidly from the column
A
d) Pollutants may elude rapidly from the column
4
Q
- Which of the following are not the characteristics of
conductivitimetry method used to measure sulphur
dioxide?
a) Fast response
b) High sensitivity
c) Free from interference by other gases
d) Good accuracy
A
c) Free from interference by other gases
5
Q
- The ability of sulphur dioxide to reduce iodine is used in
which of the following methods?
a) Colorimetry
b) Conductivitimetry
c) Coulometry
d) Gas chromatography
A
c) Coulometry
6
Q
- Which of the following are not the characteristics of
colorimetry method used to monitor sulphur dioxide?
a) It is simple
b) It has high sensitivity
c) It has good specificity
d) It is affected by interference from H2SO4, SO3, NH3, etc
A
d) It is affected by interference from H2SO4, SO3, NH3, etc
7
Q
- Which of the following materials are used as electrodes
in the coulometric method for the measurement of
sulphur dioxide?
a) Gold
b) Silver
c) Platinum
d) Nicke
A
c) Platinum
7
Q
- Which of the following is the detection limit of the
coulometric method used for measurement of sulphur
dioxide?
a) 0.1 ppm
b) 1 ppm
c) 2 ppm
d) 0.01 ppm
A
d) 0.01 ppm
8
Q
- Sensitivity to total sulphur by Flame-photometric
detector is which of the following levels?
a) 0.1 ppm
b) 1 ppm
c) 2 ppm
d) 0.01 ppm
A
d) 0.01 ppm
9
Q
- Which of the following methods are not used for the
measurement of sulphur dioxide?
a) Colorimetric method
b) Correlation spectroscopy
c) Paramagnetic analyzers
d) Flame-photometry
A
c) Paramagnetic analyzers
10
Q
- Which of the following is the wavelength of the
radiation generated when an air stream containing sulphur
dioxide is burned in a hydrogen-rich flame?
a) 243 nm
b) 394 nm
c) 467 nm
d) 516 nm
A
b) 394 nm
11
Q
- In conductivitimetric method, the concentration of
sulphur dioxide is proportional to which of the following
parameters of the saw-tooth waveform?
a) Average voltage
b) Peak voltage
c) Slope
d) RMS voltage
A
c) Slope
12
Q
- The response of coulometric method is instantaneous.
a) True
b) False
A
b) False
12
Q
- In the conductivitimetric method, to measure the
conductivity of the cell, 5V ___________ is applied across
the electrodes.
a) DC
b) AC
c) Pulsating DC
d) DC or AC
A
b) AC
13
Q
- In Saltzman method, which of the following are formed when air containing NO2 is passed in an absorbing solution consisting of the sulphanilic acid and diamine dissolved in
the acetic acid medium?
a) Blue colour dye complex
b) Green colour dye complex
c) Pink colour dye complex
d) Orange colour dye complex
A
c) Pink colour dye complex
14
Q
- NO can be analysed by converting it into NO2 and
passing it through potassium permanganate. Which of the following is the main disadvantage of this method?
a) Less accuracy
b) Dye formed is unstable
c) Dye formed is colourless
d) Quantity of dye is low
A
b) Dye formed is unstable
15
Q
- In Jacob-Hochheiser method, NO2 is passed through a
dilute solution of sodium hydroxide forming the nitrite ion.
The nitrite ion is reacted with sulphanilamide and ethylene
diamine in which of the following to form the highly
coloured azo dye?
a) Sulphuric acid
b) Hydrochloric acid
c) Nitric acid
d) Phosphoric acid
A
d) Phosphoric acid
16
Q
- Which of the following methods results in the formation
of yellow coloured compound?
a) Griess-Saltzman method
b) Phenoldisul phonoic acid method
c) Chemiluminescence method
d) West-Gaeke method
A
b) Phenoldisul phonoic acid method
17
Q
- Which of the following is the most common application
of Chemiluminescence method used for the analysis of
Nitrogen oxides?
a) In medical applications
b) In automotive exhaust gases
c) In manufacturing processes
d) In chemical industries
A
b) In automotive exhaust gases
18
Q
- Which of the following is the wavelength at which CO
laser operates?
a) 1.005 µm
b) 5.307 µm
c) 4.952 µm
d) 6.179 µm
A
b) 5.307 µm
19
Q
- CO laser is operated at liquid nitrogen temperature.
a) True
b) False
A
a) True
19
Q
- The chemiluminescence reactor with ozonator is specific
to which of the following compounds?
a) N2
b) NO
c) NO2
d) N2O
A
b) NO
20
Q
- In which of the following ways can chemiluminescence occur in compounds of nitrogen?
a) When NO2 returns to ground state from excited state
b) When NO reacts with oxygen
c) When NO reacts with ozone
d) When NO2 is reduced to NO
A
a) When NO2 returns to ground state from excited state
21
Q
- West-Gaeke colorimetric method is used to analyse
oxides of nitrogen.
a) True
b) False
A
b) False
22
Q
- Which of the following are not the characteristics of
Non-dispersive infrared analyzer method?
a) Easy to maintain
b) High response speed
c) Effect of interfering components is high
d) High sensitivity
A
c) Effect of interfering components is high
22
Q
- Which of the following is the full scale range of Infrared
spectroscopy method used for measurement of carbon
monoxide?
a) 0-2 ppm
b) 0-500 ppm
c) 0-1 ppm
d) 0-50 ppm
A
d) 0-50 ppm
23
Q
- Which of the following is the full scale range of Gas
chromatography method used for measurement of carbon
monoxide?
a) 0-200 ppm
b) 0-500 ppm
c) 0-1 ppm
d) 0-50 ppm
A
a) 0-200 ppm
24
Q
- Non-dispersive infrared analyzer depends on the
characteristic absorption of the CO molecule at a
wavelength of __________
a) 5.4 µm
b) 4.6 µm
c) 8.9 µm
d) 10.8 µm
A
b) 4.6 µm
25
Q
- The zero of the scale is calibrated using which of the
following as the sample?
a) Air
b) Water
c) Inert gas
d) Pure nitrogen
A
d) Pure nitrogen
26
Q
- The disadvantage of Non-dispersive infrared analyzer is
that the effect of flow rate is large.
a) True
b) False
A
b) False
27
Q
- A stripper column used in gas chromatography, can be used to retain which of the following when an air sample is passed through it?
a) CO
b) Methane
c) Light hydrocarbons
d) Heavy hydrocarbons
A
d) Heavy hydrocarbons
28
Q
- Which of the following is not a component of the
mixture present in the reference cell of Non-dispersive
infrared analyzer?
a) CO
b) Nitrogen
c) Water vapour
d) Hydrogen
A
d) Hydrogen
29
Q
- Hydrogen flame ionization detector can be used to
detect only the peak of CO and not methane.
a) True
b) False
A
b) False
30
Q
- CO analyzers based on infrared absorption would give
greater sensitivity under which of the following
conditions?
a) With larger cell path lengths
b) With smaller cell path lengths
c) By changing the gases in the reference cell
d) By increasing the sample flow rate
A
a) With larger cell path lengths
31
Q
- Which of the following is the most abundant
hydrocarbon which is emitted into the atmosphere by
biological activity?
a) Ethane
b) Methane
c) Poly Aromatic hydrocarbons
d) Pentane
A
b) Methane
31
Q
- Which of the following methods cannot be used for the
estimation of hydrocarbons?
a) Mass spectroscopy
b) Chemiluminescence method
c) Ultraviolet absorption
d) Gas chromatography
A
b) Chemiluminescence method
32
Q
- Flame ionization detectors are sensitive to which of the
following gases?
a) Carbon dioxide
b) Methane
c) Carbon monoxide
d) Sulphur dioxide
A
b) Methane
32
Q
- How can carbon monoxide be detected using flame
ionization detectors while using gas chromatography
technique?
a) By converting it into carbon dioxide
b) By converting it into methane
c) By mixing it with combustible gases
d) It cannot be detected
A
b) By converting it into methane
33
Q
- Which of the following organic compounds will have the
highest intensity of response when introduced in a flame
ionization detector?
a) Methane
b) Ethane
c) Propane
d) Butane
A
d) Butane
34
Q
- Propane would give three times the intensity of
response as compared to methane.
a) True
b) False
A
a) True
35
Q
- In flame ionization detectors, which of the following is
the range adequate for atmospheric sampling?
a) 0-1 ppm
b) 0-2 ppm
c) 0-20 ppm
d) 0-100 ppm
A
c) 0-20 ppm
36
Q
- Which of the following methods make use of pyrolysis
while used for detecting methane?
a) Mass spectroscopy
b) Flame ionization detector
c) Ultraviolet absorption
d) Gas chromatography
A
b) Flame ionization detector
37
Q
- In flame ionization detector, the ions collected on the
negatively charged grid are amplified at the high
impedance amplifier.
a) True
b) False
A
b) False
38
Q
- Which of the following is not the characteristic of
flame ionization detector?
a) Good linearity
b) Narrow range of concentration
c) High sensitivity
d) Fast response
A
b) Narrow range of concentration
