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Analytical Instrumentation MCQ Question Set 4

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1. Which of the following UV absorbance detectors provide a real time spectrum of the component of interest?




2. Fluorescence detection is less selective than absorption detection.




3. Which of the following detectors depend on Snell’s law at the interface between the cell wall and the flowing liquid to deflect the light beam?




4. Refractive index detectors used in liquid chromatography are not based on which of the following processes?




5. Which of the following detectors can be used for detection of amino acids in protein hydrolyzates by introducing the reagent dansylchloride in the sample?




6. The reference cell is packed with which of the following in the Adsorption detector used in liquid chromatography?




7. Which of the following detectors used in liquid chromatography is also called micro-adsorption detector?




8. In UV-Visible detectors, the cells are not made of which of the following materials?




9. Which of the following is not a feature of refractive index type detectors?




10. Which of the following detectors can detect almost any component?




11. Chromatography is a physical method that is used to separate and analyse _______




12. In chromatography, the stationary phase can be _____supported on a solid.




13. Which among the following gases have diamagnetic property (ability to be repelled by magnetic fields)?




14. Which of the following gases have paramagnetic property (ability to get attracted to a magnetic field)?




15. The force produced during the operation of Paramagnetic oxygen analyzer is proportional to which of the following?




16. In Paramagnetic oxygen analyzer, the expression for magnitude of force produced can be expressed as, F = C (K-KO), where K= magnetic susceptibility of surrounding gas and KO= magnetic susceptibility of sphere. C denotes which of the following?




17. In Paramagnetic oxygen analyzer, the electrostatic force that is exerted should have which of the following features?




18. Which of the following is true about the two charged vanes that produce electric field in Paramagnetic oxygen analyzer?




19. In Paramagnetic oxygen analyzer, when no oxygen is present the magnetic force balances torque of the fibre.




20. To improve paramagnetic oxygen analyzer, the quartz suspension must be replaced with which of the following?




21. In the Beckman instrument, the flow rate recommended when the sample enters through a porous diffusion disc is which of the following?




22. In the Beckman instrument, the flow rate recommended when the sample enters directly for rapid response is which of the following?




23. Which of the following happens to the magnetic susceptibility of gases when the temperature changes?




24. If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?




25. If the oxygen content is greater than 21%, which of the following gases must be used to set the span point?




26. Which of the following does not occur in Hartman and Braun oxygen analyzer based on the magnetic wind?




27. Which of the following is not a cause of the error that could occur in Hartman and Braun oxygen analyzer based on the magnetic wind?




28. Hydrocarbons need to be removed from the sample gas to avoid errors in Hartman and Braun oxygen analyzer.




29. Magnetic wind analyzers are also known as which of the following?




30. In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?




31. Which of the following is used in magnetic wind instruments to determine the amount of oxygen?




32. Which of the following concepts are not used in magnetic wind instruments?




33. How are the hydrocarbons in the samples removed in magnetic wind instruments?




34. Which of the following bridges are used in magnetic wind instruments?




35. The extremely high inertia of the thin membrane in the oxygen sensor allows it to rapidly attain equilibrium.




36. Nitrogen dioxide can be detected with a paramagnetic analyser.




37. Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons?




38. How is NO converted to NO2 for analysis in UV and Visible analyzers?




39. How is NO converted to NO2 for analysis in Chemiluminescent analyser?




40. During analysis of NO2 using Chemiluminescent analyser, why is NO2 not made to react with ozone directly?




41. The instruments based on chemiluminescence maintain linearity in which of the following ranges?




42. How can absorption be enhanced while determining NO concentration using CO laser?




43. Which of the following detectors are generally used for detection in NO analysis using CO laser?




44. Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere?




45. A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium.




46. In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state?




47. To monitor oxides of nitrogen in stack effluents, the sample containing oxides of nitrogen is passed through a flask containing solution of H2O2 in sulphuric acid. Nitric acid is formed. The nitrate ions then react with phenol-disulphonic acid to produce blue colour.




48. Which of the following is not an advantage of electrochemical cells used for analysis of H2S?




49. Which of the following methods are mainly used in combustible gas detection equipment?




50. Which of the following is not an advantage of solid state sensor used for analysis of H2S?