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Analytical Instrumentation MCQ Question Set 14

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1. It is advantageous to use ions from a variety of gases.




2. Which of the following gases is not often used in ion spectroscopy?




3. ISS is sensitive to every element heavier than which of the following?




4. Which of the following is the lightest isotope used as a primary ion?




5. The specificity will vary depending on the scattering gas used.




6. ISS is less sensitive than which of the following?




7. Which of the following is the detection limit of ISS for monolayer?




8. After passing through the pre-filter, ions are passed through which of the following?




9. Which of the following is the range of quadrupole mass spectrometer used in SIMS?




10. Which of the following is the resolution of quadrupole mass spectrometer used in SIMS?




11. Electron spin resonance involves detecting the detection of a physical phenomenon of _________ of electromagnetic radiation.




12. Electron spin resonance is also known as which of the following?




13. The value of the magnetic moment is known as which of the following?




14. When a strong magnetic field is applied to the unpaired spins of an electron, the electrons will be split into two groups.




15. When the electrons are aligned either parallel or antiparallel to the direction of the external magnetic field, the electrons will precess about the axis at a frequency that is proportional to which of the following?




16. If a weaker radiofrequency alternating magnetic field, having the frequency of precession of the electron is applied at right angles to fixed magnetic field, which of the following occurs?




17. If the population of ground state exceeds the population of the excited state a net absorption of __________ radiation takes place.




18. The population ratio can be given by which of the following laws?




19. The sensitivity of measurement is greatly enhanced by using which of the following?




20. ESR sensitivity increases with __________ temperature and with _________ magnetic field strength.




21. ESR is remarkably sensitive when compared with NMR.




22. Reflex klystron is used in which of the following frequency ranges?




23. Under ideal conditions, a commercial X-band spectrometer can detect of the order of which of the following number of spins at room temperature?




24. Waveguides look like _________ cross-section pipes with dimensions of the order of the wavelength to be transmitted.




25. Klystron can generate power in which of the following ranges?




26. Microwave frequency can be tuned over a small range by adjusting the distance between which of the following?




27. Microwaves are generated by __________ and the power level is adjusted with the ____




28. Which of the following is also known as reflex oscillator?




29. Microwaves reflected back from the cavity are routed to which of the following?




30. Which of the following routes are the microwaves entering from the klystron towards the cavity?




31. By introducing which of the following, signal-to-noise ratio can be improved?




32. Which of the following is adjusted as a fine control for frequency tuning?




33. In basic ESR spectrometer, the cavity length is adjustable.




34. The cavity resonant frequency should be equal to which of the following?




35. When klystron frequency is close to the cavity resonant frequency, much less power is reflected from the cavity to the diode.




36. From which of the following are electrons emitted in the klystron tube?




37. Which of the following is the operating frequency of the ESR spectrometer?




38. At which of the following frequencies is the magnetic field at the sample modulated?




39. The output of the klystron does not pass through which of the following?




40. Which of the following is used as detector crystal in ESR spectrometer?




41. After detection, the resulting signal will have which of the following frequencies?




42. Which of the following is the modulation amplitude range of ESR spectrometer?




43. In which of the following ranges will the receiver time constant of the ESR spectrometer lie?




44. Which of the following is the oscilloscope field width of the ESR spectrometer?




45. The magnet used in ESR spectrometer provides a magnetic field which can be varied from ________ to _______




46. Which of the following sensor is used in ESR spectrometer?




47. Which of the following oscillator is used as 1230 Hz oscillator?




48. What does AFC stand for?




49. Klystron requires _______ for the klystron beam and up to _____ for the klystron reflector.




50. The klystron body is insulated from ground by an insulating gas casket.