General TE4 Multichoice Questions Flashcards
Which of the following performance characteristics for an analysis system would NOT be included in the uncertainty budget?
A. Span drift
B. Lack of fit (linearity)
C. Detection limit
D. Sensitivity to ambient temperature
General TE4 Multichoice Questions
C. Detection limit
General TE4 Multichoice Questions
How does an increase in temperature affect a concentration?
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The concentration decreases (think of a balloon - applying heat to it makes the balloon larger, so anything inside the balloon will occupy a larger volume and will therefore will be at a lower concentration)
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How does an increase in pressure affect a concentration?
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The concentration increases (think of a balloon - applying pressure to it makes the balloon smaller, so anything inside the balloon will occupy a smaller volume and will therefore will be at a higher concentration)
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What coverage factor is used to convert a standard uncertainty to the corresponding expanded uncertainty at 95% confidence?
A. 1.5
B. 2
C. 2.5
D. 3
General TE4 Multichoice Questions
B. 2
General TE4 Multichoice Questions
If 100ppm of each of the following gases were injected into a FID analyser, in what order would be the size of the instrument responses if the output is in mass concentration units?
A. C6H6, C2H2, CH4, CO
B. CH4, C2H2, C6H6, CO
C. CO, C6H6, CH4, C2H2
D. CO, C2H2, CH4, C6H6
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A. C6H6, C2H2, CH4, CO
General TE4 Multichoice Questions
The mass emission rate of a pollutant gas is the product of which two parameters?
A. The gas concentration at STP and dry conditions and the gas volume flow rate
B. The sample gas velocity and the gas concentration
C. The sample gas concentration and the gas volume flow rate in the stack at the same conditions
D. The gas concentration at reference oxygen level and the gas volume flow rate
General TE4 Multichoice Questions
C. The sample gas concentration and the gas volume flow rate in the stack at the same conditions
General TE4 Multichoice Questions
A span gas should typically have a concentration which is about?
A. 100% of analyser full scale reading
B. 110% of analyser full scale reading
C. 60% of analyser full scale reading
D. 80% of analyser full scale reading
General TE4 Multichoice Questions
D. 80% of analyser full scale reading
General TE4 Multichoice Questions
What is the maximum permissible trace concentration of oxygen in the zero gas for O2 measurement by BS EN 14789:2017?
A. < 0.5% Oxygen
B. < 0.1% Oxygen
C. < 0.05% Oxygen
D. < 0.01% Oxygen
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C. < 0.05% Oxygen
General TE4 Multichoice Questions
Which of the following would be the correct order for undertaking an extractive instrumental determination of a gaseous species in a flue gas?
A. Carry out a leak test, disassemble the sampling train, calibrate the analyser, begin sampling and monitoring of the flue gas concentration
B. Begin sampling and monitoring of the flue gas concentration, calibrate the analyser, disassemble the sampling train, carry out a leak test
C. Calibrate the analyser, carry out a leak test, begin sampling and monitoring of the flue gas concentration, disassemble the sampling train
D. Calibrate the analyser, carry out a leak test, disassemble the sampling train, monitoring of the flue gas concentration
General TE4 Multichoice Questions
C. Calibrate the analyser, carry out a leak test, begin sampling and monitoring of the flue gas concentration, disassemble the sampling train
General TE4 Multichoice Questions
An emission of 80 mg/m3 at 453K and 121.6 kPa corresponds to what concentration at standard temperature and pressure (STP)? (STP = 273K and 101.3 kPa)
A. 159.2 mg/Nm3
B. 110.6 mg/Nm3
C. 57.9 mg/Nm3
D. 132.7 mg/Nm3
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B. 110.6 mg/Nm3
(80 x 453/273 x 101.3/121.6)
General TE4 Multichoice Questions
