61 + Interview Questions in Nuclear Magnetic Resonance Spectrometer in Analytical Instrumentation Page 1 InterviewSolution

1.	Nuclei having either the number of protons or neutrons as odd have _______ spin.(a) Integral spin(b) Half integral spin(c) Zero spin(d) Positive spinThis question was addressed to me during an interview.My question comes from Principle of Nuclear Magnetic Resonance Spectrometer topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct ANSWER is (b) HALF INTEGRAL spin The explanation is: NUCLEI having either the number of protons or neutrons as odd have half-integral spin. Examples are H1 and B11.

Discussion

2.	Chemical shift allows a chemist to obtain the idea of how atoms are joined together.(a) True(b) FalseI have been asked this question in quiz.Asked question is from Principle of Nuclear Magnetic Resonance Spectrometer topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct choice is (a) True Best explanation: Chemical SHIFT allows a CHEMIST to obtain the IDEA of how atoms are joined together. It is also possible to know the number of PARTICULAR atoms present in a molecule.

Discussion

3.	Which of the following NMR spectrometers have stressed reliability and ease of operation?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeThe question was asked during an online exam.Question is taken from Types of NMR Spectrometers topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT answer is (a) Minimal type The BEST explanation: Minimal type has stressed the reliability and ease of operation. It USES a permanent MAGNET.

Discussion

4.	Fourier transform can be accomplished by using which of the following components?(a) Spin decoder(b) Detector(c) Spectrum analyser(d) OscilloscopeThe question was posed to me in semester exam.My doubt stems from Fourier Transform NMR Spectroscopy topic in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct ANSWER is (c) SPECTRUM analyser Best explanation: Fourier transform can be accomplished by USING a spectrum analyser. Any complex waveform can be converted to frequencies using Fourier transform.

Discussion

5.	Frequency spectrum of noise occupies a band that is _________ the signal spectrum. Choose the most appropriate option.(a) Narrow than(b) Wider than(c) Different from(d) Same asI got this question in a national level competition.This interesting question is from Sensivity Enhancement for NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT choice is (b) WIDER than Easiest EXPLANATION: FREQUENCY spectrum of NOISE occupies a band that is wider than the signal spectrum. Filters operate on this concept.

Discussion

6.	Nuclear induction probes’ one coil is used for signal detection. What is the function of the other coil?(a) Sample irradiation(b) Magnet(c) Detector(d) Sweep generatorThis question was posed to me during an online exam.I'd like to ask this question from Continuous Wave NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct CHOICE is (a) Sample irradiation To explain I would say: Crossed coil probes are also called nuclear INDUCTION probes. ONE coil is USED for irradiating the sample. The other coil is mounted orthogonally for SIGNAL detection.

Discussion

7.	Which of the following can be used instead of magnets to produce the magnetic field?(a) Inductor(b) Motor(c) Generator(d) Superconducting solenoidsI have been asked this question during an online interview.Origin of the question is Continuous Wave NMR Spectroscopy in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT choice is (d) SUPERCONDUCTING solenoids The explanation is: Superconducting solenoids can be used instead of magnets to produce the MAGNETIC field. The magnet must be stable and homogeneous.

Discussion

8.	Which of the following techniques do not enhance sensitivity by a factor of 10 at normal operating conditions?(a) Optimization of sample volume(b) Optimization of instrumental parameters(c) Optimization of noise(d) Time averagingI have been asked this question in an interview for internship.I'd like to ask this question from Sensivity Enhancement for NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT OPTION is (d) Time averaging Explanation: Time averaging techniques does not ENHANCE sensitivity by a factor of 10. The other two techniques enhance sensitivity by a factor of 10 at NORMAL operating CONDITIONS.

Discussion

9.	Which of the following cannot be done due to the multiplex advantage?(a) Repetitive signals can be summed(b) Repetitive signals can be averaged(c) Increases signal to noise ratio(d) Decreases signal to noise ratioThe question was asked in an online quiz.Question is taken from Fourier Transform NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (d) DECREASES signal to noise ratio To explain: The multiplexing advantage allows improvement of the signal to noise ratio. It also allows REPETITIVE SIGNALS to be SUMMED and averaged.

Discussion

10.	The amplitude of the NMR signal caused by the absorption of RF energy at the radio frequency does not depend upon the power of the RF energy applied.(a) True(b) FalseI had been asked this question in semester exam.My question comes from Sensivity Enhancement for NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right answer is (b) False The explanation is: The amplitude of the NMR signal caused by the absorption of RF ENERGY at the radio frequency DEPENDS on the power of the RF energy applied. It also depends on the SWEEP RATE SELECTED.

Discussion

11.	Which of the following is not involved in signal averaging?(a) A system to repeatedly scan the spectral region of interest(b) Some storage device to store information(c) A system to coherently add individual spectra(d) Sweep generatorI have been asked this question in semester exam.My question is from Sensivity Enhancement for NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT answer is (d) SWEEP generator The best I can explain: Sweep generator is not involved in signal AVERAGING. This is usually ACCOMPLISHED using a small computer.

Discussion

12.	Which of the following are considered to be the lowest form of Electromagnetic radiation?(a) IR radiation(b) Micro waves(c) UV radiation(d) Radio wavesI had been asked this question by my college professor while I was bunking the class.Asked question is from Principle of Nuclear Magnetic Resonance Spectrometer topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct choice is (d) RADIO WAVES To elaborate: Radio waves are CONSIDERED to be the LOWEST form of Electromagnetic radiation. NMR uses radio frequency radiation for detection of the structure of substances.

Discussion

13.	Which of the following is not a type of NMR spectrometer?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI got this question in an online interview.My enquiry is from Types of NMR Spectrometers in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT OPTION is (b) Maximal type The explanation: Maximal type is not a type of NMR SPECTROMETER. MINIMAL type, Multipurpose type and WIDELINE type are types of NMR spectrometer.

Discussion

14.	In wideline NMR spectrometers, which of the following has to be supplied to the electromagnet?(a) Slowly varying low voltage(b) Rapidly varying low voltage(c) Slowly varying scan voltage(d) Rapidly varying scan voltageThis question was addressed to me at a job interview.Question is taken from Types of NMR Spectrometers in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct CHOICE is (c) Slowly VARYING scan voltage The best I can EXPLAIN: In wideline NMR SPECTROMETERS, slowly varying scan voltage has to be supplied to the electromagnet. This is INJECTED using a regulator.

Discussion

15.	Which of the following is not true of electromagnets?(a) They are expensive(b) They require a power supply(c) They don’t require a cooling system(d) They don’t require extensive shieldingThis question was posed to me in semester exam.My question comes from Continuous Wave NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT ANSWER is (c) They don’t require a cooling system Explanation: Electromagnets require a power SUPPLY. They also require cooling SYSTEMS.

Discussion

16.	A 15.4 MHz crystal generates the _________ resonance frequency.(a) Hydrogen(b) Deuterium(c) Tritium(d) HeliumI got this question in quiz.This key question is from Fourier Transform NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct OPTION is (b) Deuterium Explanation: A 15.4 MHz crystal generates the deuterium resonance FREQUENCY. This resonance signal is USED to LOCK the MAGNETIC signal to clock frequency.

Discussion

17.	In Spin Decoupler, the difference frequency circuit provides a means of mixing two signals and a filter to recover which of the following?(a) Low-frequency component(b) High-frequency component(c) Low-voltage component(d) High-voltage componentThe question was posed to me at a job interview.My question is based upon Sensivity Enhancement for NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right CHOICE is (a) Low-frequency component Easy explanation: In Spin Decoupler, the difference frequency circuit provides a MEANS of mixing TWO signals and a FILTER to recover the low-frequency component. It is included to provide a read-out frequency.

Discussion

18.	The voltage generated by the receiver coil is small and it must be amplified.(a) True(b) FalseThis question was posed to me by my school teacher while I was bunking the class.My enquiry is from Continuous Wave NMR Spectroscopy in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT answer is (a) True For explanation I would say: The voltage generated by the receiver coil is small and it MUST be amplified. It is them FED to the recorder or oscilloscope.

Discussion

19.	Which of the following type of NMR spectrometer uses a frequency synthesizer to generate RF fields?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI had been asked this question by my school teacher while I was bunking the class.Query is from Types of NMR Spectrometers topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT option is (C) Multipurpose type To explain: Wideline type NMR spectrometer USES a frequency synthesizer to generate RF fields. It is a type of CONTINUOUS wave NMR spectrometer.

Discussion

20.	Permanent magnet cannot be used in wideline type NMR spectrometer.(a) True(b) FalseI got this question by my school teacher while I was bunking the class.Asked question is from Types of NMR Spectrometers topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT option is (b) False Explanation: Permanent magnet can be used in WIDELINE type NMR SPECTROMETER. COMPACT, light-weight electromagnet can also be used.

Discussion

21.	Suppression of frequencies which contain no signal does which of the following?(a) Increases S/N ratio(b) Decreases S/N ratio(c) S/N ratio is kept constant(d) S/N ratio becomes 1This question was posed to me in a national level competition.I would like to ask this question from Sensivity Enhancement for NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct answer is (a) Increases S/N ratio To EXPLAIN: SUPPRESSION of frequencies which contain no signal increases S/N ratio. The noise DECREASES.

Discussion

22.	NMR spectroscopy indicates the chemical nature of the __________ and spatial positions of _______(a) Electrons, Protons(b) Neutrons, electrons(c) Nuclei, electrons(d) Nuclei, neighbouring nucleiThis question was addressed to me during an interview.The above asked question is from Principle of Nuclear Magnetic Resonance Spectrometer in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT answer is (d) NUCLEI, NEIGHBOURING nuclei The explanation: NMR spectroscopy indicates the chemical nature of the nuclei and SPATIAL positions of neighbouring nuclei. It is one of the most POWERFUL techniques for chemical analysis.

Discussion

23.	The difference between the field necessary for resonance in the sample and in some arbitrary a chosen compound is which of the following?(a) Field shift(b) Matrix effects(c) Chemical shift(d) Resonance shiftThis question was addressed to me in quiz.My question is taken from Principle of Nuclear Magnetic Resonance Spectrometer in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT CHOICE is (c) Chemical shift Easiest explanation: The difference between the FIELD necessary for resonance in the SAMPLE and in some arbitrary chosen compound is called a chemical shift. Chemical shift is expressed in parts per million.

Discussion

24.	Which of the following NMR spectrometer emphasises on high performance versatility with cost being a secondary consideration?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI got this question by my school teacher while I was bunking the class.This intriguing question originated from Types of NMR Spectrometers topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT choice is (c) Multipurpose type Easiest explanation: Multipurpose type is mainly USED for research. Hence, it EMPHASISES on HIGH performance versatility with cost being a secondary consideration.

Discussion

25.	Which among the following NMR spectrometer is the more diverse spectrometer?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI had been asked this question in unit test.My question is from Types of NMR Spectrometers topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct option is (c) Multipurpose type The BEST EXPLANATION: Multipurpose type NMR spectrometer is more diverse. These instruments are designed mainly for research.

Discussion

26.	Which of the following components are used to separate the nuclear spin energy states?(a) RF channels(b) Magnet(c) Sample probe(d) Sweep generatorI had been asked this question by my school teacher while I was bunking the class.This intriguing question originated from Continuous Wave NMR Spectroscopy in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» RIGHT answer is (b) MAGNET To elaborate: A magnet is used to SEPARATE the nuclear SPIN energy states. PERMANENT magnet or electromagnets can be used.

Discussion

27.	NMR spectrometer provides ____________ and _____________ method of determining structure in soluble chemical compounds.(a) Accurate, destructive(b) Accurate, non-destructive(c) Inaccurate, destructive(d) Inaccurate, non-destructiveThe question was asked in examination.I would like to ask this question from Principle of Nuclear Magnetic Resonance Spectrometer in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct choice is (b) Accurate, non-destructive To EXPLAIN: NMR spectrometer provides an accurate and non-destructive method of determining structure in soluble chemical compounds. For a PARTICULAR nucleus an NMR absorption SPECTRUM MAY consist of one to several groups of absorption lines.

Discussion

28.	Which of the following must be done to improve sensitivity?(a) Frequency sweep mode must be preferred(b) Field sweep mode must be preferred(c) Single channel excitation must be preferred(d) Multichannel excitation must be preferredThis question was addressed to me during an online exam.I'm obligated to ask this question of Fourier Transform NMR Spectroscopy in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT OPTION is (d) Multichannel excitation must be preferred The best explanation: Sweep techniques have LESS SENSITIVITY. To IMPROVE sensitivity, multichannel excitation must be preferred.

Discussion

29.	Which of the following is the disadvantage of multichannel excitation?(a) Low sensitivity(b) Low resolution(c) Small number of frequencies is present(d) UneconomicalThe question was asked during an interview.Asked question is from Fourier Transform NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT answer is (d) Uneconomical The explanation: Large number of frequencies is PRESENT in multichannel EXCITATION. This is uneconomical since a receiver is REQUIRED for each channel.

Discussion

30.	The amount of energy available in radio frequency radiation is sufficient for which of the following?(a) Excite an atom(b) Vibrate an atom(c) Vibrate a molecule(d) Affect the nuclear spin of an atomI have been asked this question by my college professor while I was bunking the class.The question is from Principle of Nuclear Magnetic Resonance Spectrometer topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct ANSWER is (d) Affect the NUCLEAR spin of an ATOM Best explanation: The amount of energy available in radio frequency radiation is sufficient for affecting the nuclear spin of an atom. It constitutes the most fundamental part of spectroscopy.

Discussion

31.	NMR spectroscopy is used for determining structure in which of the following materials?(a) Radioactive materials(b) Insoluble chemical compounds(c) Liquids(d) GasesThis question was posed to me during an interview for a job.I'm obligated to ask this question of Principle of Nuclear Magnetic Resonance Spectrometer in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct choice is (c) LIQUIDS For EXPLANATION I would SAY: NMR spectroscopy is used for determining structure in liquids. It is ALSO used for determining the structure in soluble CHEMICAL compounds.

Discussion

32.	In field sweep method, which of the following parameters are varied continuously?(a) Magnetic field(b) RF signal(c) Sample concentration(d) Amplification factorThis question was posed to me during an interview.My question comes from Continuous Wave NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct ANSWER is (a) Magnetic field The EXPLANATION is: In frequency SWEEP method, RF signal is HELD CONSTANT. Magnetic field is swept or varied continuously.

Discussion

33.	The single coil probe supplies the RF radiation to the sample and also serves as a part of which of the following circuits?(a) RF channels(b) Magnet(c) Detector(d) Sweep generatorThis question was posed to me in examination.I want to ask this question from Continuous Wave NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct ANSWER is (c) Detector The best explanation: The single coil PROBE SUPPLIES the RF radiation to the SAMPLE and also serves as a PART of the detector circuit. It has only one coil.

Discussion

34.	Given below is the diagram of Cw NMR spectrometer. Identify the unmarked component.(a) Recorder(b) RF channel(c) Receiver(d) Sweep generatorI got this question in homework.This interesting question is from Continuous Wave NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT OPTION is (d) Sweep generator Easy explanation: The unmarked component is sweep generator. EITHER field or FREQUENCY can be SWEPT.

Discussion

35.	In NMR spectroscopy, the spinning nuclei in a strong magnetic field must be irradiated by which of the following?(a) Perpendicular and stronger field(b) Perpendicular and weaker field(c) Parallel and stronger field(d) Parallel and weaker fieldThe question was asked in unit test.I'm obligated to ask this question of Principle of Nuclear Magnetic Resonance Spectrometer topic in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (b) Perpendicular and weaker FIELD To explain I would say: In NMR spectroscopy, the spinning NUCLEI in a strong magnetic field MUST be irradiated by a weaker field which is perpendicular to it. This permits the identification of ATOMIC configurations in molecules.

Discussion

36.	Which of the following is used as a coolant for magnets in continuous-wave NMR spectrometer?(a) Water(b) Liquid He(c) Liquid Na(d) Heavy waterThis question was posed to me in an interview for internship.This intriguing question comes from Types of NMR Spectrometers in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct option is (a) Water Explanation: Water is USED as a coolant for magnets in continuous-wave NMR spectrometer. LIQUID He is used for FT-NMR SPECTROMETERS.

Discussion

37.	The sample is contained in which of the following components?(a) Flask(b) Capillary tube(c) Curvette(d) Bore glass tubeI had been asked this question by my college professor while I was bunking the class.My question is from Continuous Wave NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct choice is (d) BORE glass tube To EXPLAIN I WOULD say: The SAMPLE is contained in a bore glass tube. It should be cylindrical and thin-walled.

Discussion

38.	Sensitivity is the ratio of peak signal amplitude to which of the following?(a) Time(b) Rms noise(c) Average noise(d) Peak-to-peak noiseI had been asked this question by my school principal while I was bunking the class.I need to ask this question from Sensivity Enhancement for NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct answer is (b) Rms noise To ELABORATE: Sensitivity is the ratio of peak signal AMPLITUDE to rms noise. It is a MEASURE of the ability of an INSTRUMENT to differentiate signal from SURROUNDING noise.

Discussion

39.	How is the inhomogeneity of magnetic fields compensated?(a) With large magnetic fields(b) With small magnetic fields(c) By using two or more magnets(d) By providing required insulationThis question was addressed to me during an interview.Enquiry is from Continuous Wave NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right option is (b) With small magnetic fields Explanation: The MAGNET must be stable and homogeneous. The inhomogeneity of magnetic fields is COMPENSATED with small magnetic fields.

Discussion

40.	In Spin Decoupler, the output of the DC amplifier is applied to which of the following to control the power supplied to the oven heaters?(a) Power diode(b) Power transistor(c) Power MOSFET(d) Power IGBTThe question was posed to me at a job interview.This interesting question is from Sensivity Enhancement for NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct answer is (b) Power transistor The EXPLANATION: In Spin Decoupler, the output of the DC amplifier is applied to the power transistor to CONTROL the power supplied to the oven heaters. The TEMPERATURE is maintained at plus or minus 1oC.

Discussion

41.	In frequency sweep method, which of the following parameters are varied continuously?(a) Magnetic field(b) RF signal(c) Sample concentration(d) Amplification factorI have been asked this question in an interview for internship.The above asked question is from Continuous Wave NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct option is (b) RF signal Easy explanation: In FREQUENCY SWEEP METHOD, magnetic FIELD is held constant. RF signal is swept or varied continuously.

Discussion

42.	Which of the following must not be done to maintain the magnetic field over the sample uniform in space and time?(a) Large pole pieces need to be used(b) Pole faces must be polished(c) Wide pole gap must be present(d) Magnets can be permanent or electromagnetThe question was asked in my homework.The question is from Continuous Wave NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The CORRECT answer is (c) WIDE pole gap must be PRESENT The explanation: Narrow pole gap must be present to maintain the magnetic field over the sample uniform in space and time. The pole faces must be POLISHED to optical TOLERANCES.

Discussion

43.	Elementary particles such as electrons and nucleus have the property of spin.(a) True(b) FalseThe question was asked in an international level competition.The query is from Principle of Nuclear Magnetic Resonance Spectrometer in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right option is (a) True The explanation is: ELEMENTARY PARTICLES such as electrons and nucleus have the property of SPIN. They are known to BEHAVE as if they ROTATE about an axis.

Discussion

44.	In order to have a long measuring time for increasing sensitivity, it is better to have several fast scans than a single slow scan.(a) True(b) FalseI got this question during an online interview.I'd like to ask this question from Sensivity Enhancement for NMR Spectroscopy in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct CHOICE is (a) True To explain: In order to have a LONG measuring TIME for increasing sensitivity, it is better to have several fast scans than a single slow SCAN. The sensitivity increases by the square ROOT of a number of scans.

Discussion

45.	Two coils are necessary for Fourier transform NMR spectroscopy.(a) True(b) FalseThis question was posed to me during a job interview.My question is from Fourier Transform NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right ANSWER is (b) False For explanation: Only one coil is NECESSARY for Fourier TRANSFORM NMR spectroscopy. The coil serves as both ANTENNA for transmitting and receiving RF radiation.

Discussion

46.	Fourier transform NMR spectrometer has which of the following characteristics?(a) Increased sensitivity, long time to obtain data(b) Decreased sensitivity, long time to obtain data(c) Increased sensitivity, reduced time to obtain data(d) Decreased sensitivity, reduced time to obtain dataThe question was asked at a job interview.This is a very interesting question from Fourier Transform NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Correct choice is (C) Increased sensitivity, REDUCED time to obtain data To EXPLAIN: Fourier transform NMR spectrometer has increased sensitivity. It takes less time to obtain NMR data.

Discussion

47.	NMR is the study of the absorption of __________ by nuclei in a magnetic field.(a) Radioactive radiation(b) IR radiation(c) Radio frequency radiation(d) MicrowavesThis question was addressed to me in an international level competition.The question is from Principle of Nuclear Magnetic Resonance Spectrometer in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct answer is (c) Radio FREQUENCY radiation The explanation is: NMR is the STUDY of absorption of radio frequency radiation by nuclei in a magnetic field. For a particular nucleus, an NMR absorption spectrum may CONSIST of one to several groups of absorption lines.

Discussion

48.	The most common spherical cells have which of the following dimensions?(a) 4mm diameter(b) 40mm diameter(c) 8mm diameter(d) 80mm diameterThis question was addressed to me in final exam.This interesting question is from Sensivity Enhancement for NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» The correct choice is (a) 4mm diameter Explanation: The most common spherical CELLS have 4mm diameter. A 1mm capillary CELL is centred along the AXIS of the coil.

Discussion

49.	How can the need for an array of narrow-band filters and detectors be eliminated?(a) By using multi-channel excitation(b) By using a detector for each frequency(c) By reducing the number of detectors(d) By using Fourier transformThe question was asked at a job interview.The origin of the question is Fourier Transform NMR Spectroscopy in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» Right CHOICE is (d) By using Fourier transform Explanation: Fourier transform plays the role of a multichannel RECEIVER. Hence, the NEED for array of narrow-band filters can be eliminated

Discussion

50.	Fourier transform NMR spectrometer allows NMR transitions to be observed simultaneously.(a) True(b) FalseThe question was asked in an internship interview.This interesting question is from Fourier Transform NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation
Answer» CORRECT OPTION is (a) True The explanation is: FOURIER transform NMR spectrometer is a type of NMR spectrometer. It allows samples to be observed SIMULTANEOUSLY instead of serially.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is not a type of NMR spectrometer?(a) Minimal type(b) Maximal type(c) Multipurpose type(d) Wideline typeI got this question in an online interview.My enquiry is from Types of NMR Spectrometers in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

A 15.4 MHz crystal generates the _________ resonance frequency.(a) Hydrogen(b) Deuterium(c) Tritium(d) HeliumI got this question in quiz.This key question is from Fourier Transform NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

Permanent magnet cannot be used in wideline type NMR spectrometer.(a) True(b) FalseI got this question by my school teacher while I was bunking the class.Asked question is from Types of NMR Spectrometers topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

Two coils are necessary for Fourier transform NMR spectroscopy.(a) True(b) FalseThis question was posed to me during a job interview.My question is from Fourier Transform NMR Spectroscopy topic in section Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation