This set of Analytical Instrumentation Multiple Choice Questions & Answers (MCQs) focuses on “Types of NMR Spectrometers”.
1. Which of the following is not a type of NMR spectrometer?
a) Minimal type
b) Maximal type
c) Multipurpose type
d) Wideline type
View Answer
Explanation: Maximal type is not a type of NMR spectrometer. Minimal type, Multipurpose type and Wideline type are types of NMR spectrometer.
2. Which of the following NMR spectrometers have stressed reliability and ease of operation?
a) Minimal type
b) Maximal type
c) Multipurpose type
d) Wideline type
View Answer
Explanation: Minimal type has stressed the reliability and ease of operation. It uses a permanent magnet.
3. 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 type
View Answer
Explanation: Wideline type NMR spectrometer uses a frequency synthesizer to generate RF fields. It is a type of continuous wave NMR spectrometer.
4. 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 voltage
View Answer
Explanation: In wideline NMR spectrometers, slowly varying scan voltage has to be supplied to the electromagnet. This is injected using a regulator.
5. Which among the following NMR spectrometer is the more diverse spectrometer?
a) Minimal type
b) Maximal type
c) Multipurpose type
d) Wideline type
View Answer
Explanation: Multipurpose type NMR spectrometer is more diverse. These instruments are designed mainly for research.
6. Permanent magnet cannot be used in wideline type NMR spectrometer.
a) True
b) False
View Answer
Explanation: Permanent magnet can be used in wideline type NMR spectrometer. Compact, light-weight electromagnet can also be used.
7. 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 type
View Answer
Explanation: Multipurpose type is mainly used for research. Hence, it emphasises on high performance versatility with cost being a secondary consideration.
8. 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 type
View Answer
Explanation: Minimal type NMR spectrometer uses a permanent magnet. Hence, it does not require a power supply and cooling system.
9. Minimal type of NMR spectrometer is inexpensive.
a) True
b) False
View Answer
Explanation: Minimal type of NMR spectrometer is inexpensive. It uses a permanent magnet and does not require a power supply.
10. 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 water
View Answer
Explanation: Water is used as a coolant for magnets in continuous-wave NMR spectrometer. Liquid He is used for FT-NMR spectrometers.
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