Q. In Spin Decoupler, the difference frequency circuit provides a means of mixing two signals and a filter to recover which of the following?

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Q. 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?

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Q. In order to have a long measuring time for increasing sensitivity, it is better to have several fast scans than a single slow scan.

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Q. Which of the following is not involved in signal averaging?

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Q. 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.

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Q. Suppression of frequencies which contain no signal does which of the following?

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Q. Frequency spectrum of noise occupies a band that is _________ the signal spectrum. Choose the most appropriate option.

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Q. Better sensitivity with good resolution can be achieved by concentrating the sample inside which of the following?

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Q. The most common spherical cells have which of the following dimensions?

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Q. Which of the following techniques do not enhance sensitivity by a factor of 10 at normal operating conditions?

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Q. Which of the following is not an operating technique for sensitivity enhancement?

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Q. Sensitivity is the ratio of peak signal amplitude to which of the following?

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Q. A 15.4 MHz crystal generates the _________ resonance frequency.

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Q. Fourier transform can be accomplished by using which of the following components?

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Q. How can the need for an array of narrow-band filters and detectors be eliminated?

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Q. Which of the following is the disadvantage of multichannel excitation?

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Q. Which of the following must be done to improve sensitivity?

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Q. Which of the following is the disadvantage of conventional mode of spectrometer or continuous-wave NMR spectrometer?

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Q. Two coils are necessary for Fourier transform NMR spectroscopy.

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Q. Which of the following cannot be done due to the multiplex advantage?

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