Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Standards
    • Basics
    • Formula
    • Erection & Commissioning
    • Process Fundamentals
    • Root Cause Analysis
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Search
  • Books
  • Software
  • Projects
  • Basics
  • Process
  • Formula
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: Sensivity Enhancement for NMR Spectroscopy Questions & Answers
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC
  • Control Systems
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Standards
    • Basics
    • Formula
    • Erection & Commissioning
    • Process Fundamentals
    • Root Cause Analysis
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Multiple Choice Questions > Sensivity Enhancement for NMR Spectroscopy Questions & Answers

Sensivity Enhancement for NMR Spectroscopy Questions & Answers

Last updated: November 27, 2021 5:38 pm
Editorial Staff
Multiple Choice Questions
No Comments
Share
6 Min Read
SHARE

Sensivity Enhancement for NMR Spectroscopy Questions & Answers

1. 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: b

Explanation: Sensitivity is the ratio of peak signal amplitude to rms noise. It is a measure of ability of an instrument to differentiate signal from surrounding noise.

2. 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: c

Explanation: There are only three operating techniques for sensitivity enhancement. Optimization of noise is not an operating technique for sensitivity enhancement.

3. 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: d

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.

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

a) 4mm diameter
b) 40mm diameter
c) 8mm diameter
d) 80mm diameter

Answer: a

Explanation: The most common spherical cells have 4mm diameter. A 1mm capillary cell is centred along the axis of the coil.

5. 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: b

Explanation: Better sensitivity with good resolution can be achieved by concentrating the sample inside a specially designed NMR microcell. It could be a spherical cell or a capillary cell.

6. 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: b

Explanation: Frequency spectrum of noise occupies a band that is wider than the signal spectrum. Filters operate on this concept.

7. 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: a

Explanation: Suppression of frequencies which contain no signal increases S/N ratio. The noise decreases.

8. 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: b

Explanation: 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.

9. 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: d

Explanation: Sweep generator is not involved in signal averaging. This is usually accomplished using a small computer.

10. 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: a

Explanation: 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 number of scans.

11. 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: b

Explanation: In Spin Decoupler, the output of the DC amplifier is applied to power transistor to control the power supplied to the oven heaters. The temperature is maintained at plus or minus 1oC.

12. 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: a

Explanation: In Spin Decoupler, the difference frequency circuit provides a means of mixing two signals and a filter to recover low-frequency component. It is included to provide a read-out frequency.

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Gas Chromatography Questions & Answers
Analyzers Based on Gas Density Questions & Answers
All-pass & Minimum-phase Systems
PID Controller Multiple Choice Questions
Robotic Control System – Part II
Fluorescent Spectrometer Questions & Answers
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Pumps Quiz
Radiofrequency Mass Spectrometer
Experimentation of Transfer Function
Fourier Transform NMR Spectroscopy Questions & Answers
Nitrogen Oxides Questions & Answers
Amino-Acid Analyzers Questions & Answers
Constructing Phase-Trajectories
Spectral Method of Analysis Questions & Answers

Keep Learning

Optimal Control Systems

Output Regulator & the Tracking Problem

Flow Measurement Multiple Choice Questions

Flow Measurement Multiple Choice Questions

Stability in Frequency Domain

Time Domain Analysis

Ion Spectrometers Questions & Answers

Instrumentation of Ion Spectroscopy

Mass Spectrometer Questions and Answers

Quadrupole Mass Spectrometer

Feedback Characteristics of Control Systems

Control of the Effects of Disturbance Signals by Use of Feedback

Flame Emission Photometers Questions & Answers

Flame Emission Photometers Questions & Answers

State Variable Analysis and Design

Observer Systems

Learn More

Capacitance-Level-Transmitter

Capacitance Level Switch Calibration

Digital Electronics Multiple Choice Questions

Ripple Counter Objective Questions

Advantages of Valve Regulated Lead Acid (VRLA) Batteries

Advantages of Valve Regulated Lead Acid (VRLA) Batteries

Auto Changeover Switch

What is an Auto Changeover Switch?

Power Plant Interview Questions & Answers

Power Plant Interview Questions & Answers

Rupture disks

Rupture disks

Digital Electronics Multiple Choice Questions

BiCMOS Logic Circuits Objective Questions

Calculate Power in Series RCL Circuit

Calculate Power in Series RCL Circuit

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?