MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Analytical Instrumentation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
All hydrogen atoms |
| A. | have the same resonance frequency |
| B. | resonate at different frequencies depending on their environment. |
| C. | are attached to carbon |
| D. | resonate at about the same frequency as carbon |
| Answer» C. are attached to carbon | |
| 2. |
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 IGBT |
| Answer» C. Power MOSFET | |
| 3. |
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. | False |
| Answer» B. False | |
| 4. |
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 generator |
| Answer» E. | |
| 5. |
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. | False |
| Answer» C. | |
| 6. |
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 noise |
| Answer» C. Average noise | |
| 7. |
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 generator |
| Answer» E. | |
| 8. |
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 IGBT |
| Answer» C. Power MOSFET | |
| 9. |
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. | False |
| Answer» B. False | |
| 10. |
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 component |
| Answer» B. High-frequency component | |
| 11. |
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. | False |
| Answer» C. | |
| 12. |
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 1 |
| Answer» B. Decreases S/N ratio | |
| 13. |
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 as |
| Answer» C. Different from | |
| 14. |
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 tube |
| Answer» C. Sample tube | |
| 15. |
The most common spherical cells have which of the following dimensions? |
| A. | 4mm diameter |
| B. | 40mm diameter |
| C. | 8mm diameter |
| D. | 80mm diameter |
| Answer» B. 40mm diameter | |
| 16. |
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 averaging |
| Answer» E. | |
| 17. |
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 averaging |
| Answer» D. Time averaging | |