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
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Assessment of Relative Stability Using Nyquist Criterion
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • 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 > Assessment of Relative Stability Using Nyquist Criterion

Assessment of Relative Stability Using Nyquist Criterion

Last updated: November 27, 2021 5:40 pm
Editorial Staff
Multiple Choice Questions
No Comments
Share
4 Min Read
SHARE

Assessment of Relative Stability Using Nyquist Criterion

1. The phase margin (in degrees) of a system having the loop transfer function G(s) H(s)=2√3/s(s+1) is:

a) 45°
b) -30°
c) 60°
d) 30°

Answer: d

Explanation: Phase margin is calculated at gain cross over frequency where magnitude of the transfer function is 1.

2. The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of :

a) -6 dB
b) 0 dB
c) 3.5 dB
d) 6 dB

Answer: b

Explanation: Gain margin is calculated at phase cross over frequency where the phase is 180°.

3. The phase angle of the system, G(s) =s+5/s<sup>2</sup>+4s+9, varies between :

a) 0° and 90°
b) 0° and -90°
c) 0° and -180°
d) -90° and -180°

Answer: a

Explanation: As it is the type 0 system so the phase angle can be 0° and 90°.

4. The polar plot of the transfer function G(s) = 10(s+1)/s+10 will be in the :

a) First quadrant
b) Second quadrant
c) Third quadrant
d) Fourth quadrant

Answer: d

Explanation: Polar plot of the given transfer function lies in the fourth quadrant.

5. As the polar plot moves toward the point (-1, 0) then the system becomes :

a) Stable
b) Marginally stable
c) Conditionally stable
d) Unstable

Answer: d

Explanation: As the polar plot moves toward the point (-1, 0) then the system becomes unstable.

6. Polar plots moving toward the imaginary axis makes the system:

a) Stable
b) Marginally stable
c) Conditionally stable
d) Unstable

Answer: d

Explanation: Polar plots moving toward the imaginary axis makes the system unstable.

7. The concepts used to measure relative stability are:

a) Phase margin
b) Gain margin
c) Phase and Gain margin
d) Stable

Answer: c

Explanation: The concepts used to measure relative stability are phase margin and gain margin.

8. Phase and gain margin are applicable to open and closed loop systems both.

a) True
b) False

Answer: b

Explanation: Phase and gain margin are applicable only to open loop systems.

9. Gain margin is:

a) It is a factor by which the system gain can be increased to drive it to the verge of instability
b) It is calculated at gain cross over frequency
c) It is calculated at phase cross over frequency
d) Both a and c

Answer: d

Explanation: Gain margin is a factor by which the system gain can be increased to drive it to the verge of instability and is calculated at phase cross over frequency.

10. Phase margin is:

a) It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability
b) It is always positive for stable feedback systems
c) It is calculated at gain cross over frequency
d) All of the mentioned

Answer: d

Explanation: Phase margin is the measure of relative stability which is always positive for stable systems.

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

Standard Test Signals Objective Questions
Transfer Functions Objective Questions
Atomic Absorption Spectroscopy Questions & Answers
Adaptive Control
The inverse z-transform & Response of Linear Discrete Systems
Realization of Basic Compensators
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

Pressure Measurement Multiple Choice Questions
Measurement and Instrumentation Objective Questions – Part 3
pH Meters Questions & Answers
Gas Chromatograph- Mass Spectrometer
Top 1000 Analytical Instrumentation Questions & Answers
Stability Analysis by Describing Functions
Nitrogen Oxides Questions & Answers
Spectral Method of Analysis Questions & Answers

Keep Learning

Spectrometers Questions and Answers

Fluorescent Spectrometer Questions & Answers

Chromatography Questions & Answers

Chromatographic Behaviour of Solutes Questions & Answers

Pneumatic Systems Objective Questions

Pneumatic Systems Objective Questions

Spectrometers Questions and Answers

X-Ray Fluorescence Spectrometry Questions and Answers

Frequency Response MCQ

Bode Plots MCQ

Chromatography Questions & Answers

Column Efficiency and Column Resolution Questions and Answers

Nonlinear Control Systems

Construction of Phase -Trajectories

Digital Control Systems Multiple Choice Questions

Digital Control Systems Multiple Choice Questions

Learn More

Linear Variable Displacement Transducer (LVDT)

What is LVDT ?

Relay ladder diagram example

How to Draw a Schematic Diagram ?

Radiochemical Questions and Answers

Liquid Scintillation Counters Questions & Answers

Power Systems Questions & Answers

Power Systems MCQ Series 9

Digital Electronics Multiple Choice Questions

Random Access Memory Objective Questions – Part 2

Rotary UPS or Dynamic UPS

What are Static UPS and Rotary UPS?

Unbonded Strain Gauge Principle

Unbonded Strain Gauge Principle

Closed Tank - Dry Reference Leg

Basics of Level Measurement

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?