Explore topic-wise MCQs in Analytical Instrumentation.

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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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.
Discussion
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
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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
Discussion