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51.	Which of the following is the disadvantage of conventional mode of spectrometer or continuous-wave NMR spectrometer?(a) They are unstable(b) Maintenance is difficult(c) High operating cost(d) Excitation is inefficientThis question was addressed to me during an interview for a job.Question is from Fourier Transform NMR Spectroscopy in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right ANSWER is (d) EXCITATION is INEFFICIENT Easiest explanation: The disadvantage of conventional mode of a spectrometer or continuous-wave NMR spectrometer is that the excitation is inefficient. Only a narrow BAND of frequencies are CONTRIBUTING to the signal at a time.

52.	Minimal type of NMR spectrometer is inexpensive.(a) True(b) FalseI have been asked this question during an internship interview.This is a very interesting question from Types of NMR Spectrometers topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right choice is (a) True Explanation: Minimal type of NMR SPECTROMETER is INEXPENSIVE. It uses a PERMANENT magnet and does not require a power supply.

53.	Which of the following statements are not true about permanent magnets?(a) They are simple(b) They are inexpensive(c) They don’t require shielding(d) They don’t require power supplyThis question was addressed to me in quiz.My question is from Continuous Wave NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct option is (C) They don’t require SHIELDING For explanation I WOULD SAY: Permanent magnets are simple and inexpensive. But, permanent magnets require extensive shielding.

54.	If the number of protons or neutrons is even the spin of the nucleus will be which of the following?(a) Integral spin(b) Half integral spin(c) Zero spin(d) Positive spinThis question was addressed to me by my school teacher while I was bunking the class.I'm obligated to ask this question of Principle of Nuclear Magnetic Resonance Spectrometer topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT answer is (c) Zero spin The EXPLANATION is: If the NUMBER of protons or NEUTRONS is even the spin of the nucleus will be zero. EXAMPLES are C12 and O16.

55.	Which of the following NMR spectrometer does not require a power supply and cooling system?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI have been asked this question during an interview.I need to ask this question from Types of NMR Spectrometers topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (a) Minimal TYPE The EXPLANATION is: Minimal type NMR spectrometer uses a permanent magnet. Hence, it does not REQUIRE a power supply and cooling system.

56.	Better sensitivity with good resolution can be achieved by concentrating the sample inside which of the following?(a) Sample cell(b) Micro cell(c) Sample tube(d) Cylindrical tubeThis question was addressed to me in unit test.Query is from Sensivity Enhancement for NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct option is (b) Micro cell Easy EXPLANATION: BETTER sensitivity with GOOD resolution can be achieved by concentrating the sample inside a specially designed NMR microcell. It could be a spherical cell or a CAPILLARY cell.

57.	The amplification required for continuous-wave NMR is of the order of which of the following?(a) 10^1(b) 10^2(c) 10^3(d) 10^5This question was posed to me in homework.This is a very interesting question from Continuous Wave NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT OPTION is (d) 10^5 The EXPLANATION is: The amplification required for continuous-wave NMR is of the order of 10^5. The SPECTRUM can be recorded after amplification.

58.	For high resolution work the magnetic field over the entire sample volume must be maintained uniform in space and time.(a) True(b) FalseI had been asked this question during an interview.The doubt is from Continuous Wave NMR Spectroscopy in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right answer is (a) True To explain I would SAY: For high resolution work the MAGNETIC field over the entire SAMPLE volume must be maintained uniform in space and time. To do this all the components must be KEPT in specified conditions.

59.	Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner?(a) Both fields should be stationary(b) Both fields should be varying(c) One field should be stationary and the other should be varying(d) It must be subjected to only one fieldThe question was asked in exam.The query is from Principle of Nuclear Magnetic Resonance Spectrometer in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct answer is (c) ONE field should be stationary and the other should be varying Explanation: Interaction between matter and ELECTROMAGNETIC radiation can be observed by SUBJECTING a substance to two MAGNETIC fields. One magnetic field must be stationary and the other field must be varying at some radio frequency.

60.	Which of the following is not an operating technique for sensitivity enhancement?(a) Optimization of sample volume(b) Optimization of instrumental parameters(c) Optimization of noise(d) Time averagingI had been asked this question in an interview for job.The origin of the question is Sensivity Enhancement for NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT answer is (c) Optimization of NOISE To elaborate: There are only THREE operating techniques for sensitivity ENHANCEMENT. Optimization of noise is not an operating technique for sensitivity enhancement.

61.	When energy is absorbed by the sample, the absorption can be observed as a change in signal developed by which of the following components?(a) Amplifier(b) Photodetector(c) GM counter(d) Radiofrequency detectorThe question was asked in my homework.This question is from Principle of Nuclear Magnetic Resonance Spectrometer topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct ANSWER is (d) RADIOFREQUENCY detector Best explanation: When energy is ABSORBED by the sample, the absorption can be OBSERVED as a change in signal DEVELOPED by a radiofrequency detector. It is then given to an amplifier.