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
  • Request
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: Cascade Compensation in Frequency Domain
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
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Multiple Choice Questions > Cascade Compensation in Frequency Domain

Cascade Compensation in Frequency Domain

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

Cascade Compensation in Frequency Domain

1. A phase lead compensation leads to:

a) Increase in overshoot
b) Reduction in bandwidth of closed loop system
c) Reduction in rise time of closed loop system
d) Reduction in gain margin

Answer: c

Explanation: Phase lead compensation and this is similar to the high pass filter results in increase in bandwidth reduction in settling time and thus, speed of response is improved.

2. PD controller is used to compensate system. Compared to the uncompensated system, the compensated system has:

a) A higher type number
b) Reduced damping
c) Higher noise amplification
d) Large transient overshoot

Answer: c

Explanation: Proportional Derivative controller is used to increase the bandwidth and also increases the signal to noise ratio by reducing the noise and increasing the signal.

3. P+D controller:

a) Introduces offset
b) Increases bandwidth
c) Increases margin of stability
d) Reduces velocity constant

Answer: c

Explanation: Proportional Derivative controller is the controller increases margin of stability and also used to increase he bandwidth and also increases the signal to noise ratio.

4. Proportional controller:

a) Introduces offset
b) Increases bandwidth
c) Increases margin of stability
d) Reduces velocity constant

Answer: a

Explanation: Proportional controller is the controller that is block used to control the gain of the control system and introduces offset error and there is no effect on the damping factor.

5. The transfer function of a lead controller is 1+20s/1+5s. The high frequency magnitude of the lead controller to dB is ___________

a) 1
b) 2
c) 3
d) 4

Answer: d

Explanation: G(s) = Tp (1+Tds)/s^2
It is type-2 function.
The type-2 function has a finite steady state error for unit-parabolic input.

6. Controllers play the following role in control system:

a) They amplify the signals going to the actuator
b) They act on the error signal coming out of the summing junction and output a suitable to the actuator
c) They try to reduce steady state error optimizes overshoot.
d) All of the mentioned

Answer: a

Explanation: Controller amplify the signals going to the actuator and they are of many types as proportional, integral, derivative some combinational controller as combination of two controllers and combination of all the controllers.

7. The transfer function of the compensator is s+4/s+16. The maximum phase lead frequency and the corresponding phase is :

a) 6 rad/sec, 36.87°
b) 8 rad/sec, 36.87°
c) 6 rad/sec, -36.87°
d) 8 rad/sec, -36.87°

Answer: b

Explanation: Phase lead frequency is calculated when magnitude of transfer function is 1 and this is the phase cross over frequency and the phase is calculated by using the tanget formula with the transfer function.

8. Response to error is very fast for integral controller.

a) True
b) False

Answer: b

Explanation: Integral controller is used to reduce or eliminate the error of the control system and for derivative controller the damping factor is increased and speed of response also increases.

9. Consider the following statements:
1. Integral controller improves steady state response
2. By use of proportional controller, maximum peak overshoot decreases
3. Type and order of system reduces by one for derivative controller
4. Integral controller makes the system less stable in transient state due to oscillations
Select the correct answer using the codes given below:

a) 1,3 and 4
b) 1,2 and 3
c) 2.3 and 4
d) 1,2 and 4

Answer: a

Explanation: Integral controller improves steady state response and derivative controller improves the transient response, type and order of system reduces by one for derivative controller.

10. Rate mode controller is also known as ______________ controller mode.

a) Anticpatory
b) Delay
c) Integral
d) Derivative

Answer: a

Explanation: Anticipatory controller mode is also known as the rate mode controller that is used to anticipate the future value with the use of the state.

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

Column Efficiency and Column Resolution Questions and Answers
Process Control Questions & Answers
Construction of Phase -Trajectories
Single Beam and Double Beam Instruments
Nyquist Stability Criterion
Liapunov’s Stability Criterion – Part I
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
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Effect of Adding a Zero to a System – II
Signal Reconstruction
Detection System of Gas Chromatography Questions and Answers
Magnetic Deflection Mass Spectrometer Questions & Answers
Time Response of Second Order Systems – I
Gas Chromatograph- Mass Spectrometer
Preliminary Considerations of Classical Design
Analytical Measurement Multiple Choice Questions

Keep Learning

Stability in Frequency Domain

Mathematical Preliminaries

Ion Spectrometers Questions & Answers

Electron Spectroscopy for Chemical Analysis

Absorption Instrumentation Questions & Answers

Absorption Instrumentation Questions & Answers

Analyzers Questions and Answers

Ionization of Gases Questions and Answers

DC Circuits Multiple Choice Questions

DC Circuits Multiple Choice Questions

Advances in Control System

Neural Networks

pH Analyzers Questions and Answers

pH Meters Questions & Answers

Spectrometers Questions and Answers

X-Ray Diffractometers Questions & Answers

Learn More

online silica analyzer

Silica Analyzer Problems and Troubleshooting Tips

Pressure Reducing and Desuperheating Station (PRDS)

Pressure Reducing and DeSuperheating Station (PRDS)

Difference Between Clamp Meters and Digital Multimeters

Difference Between Clamp Meters and Multimeters

Turbine and Compressor Control System

Turbine and Compressor Control System

Flow Meters Troubleshooting

Turbine Flow Meters Troubleshooting

Control Loops

Control Loops Objective Questions and Answers

PLC Karnaugh maps

How to Simplify PLC Coding Using Karnaugh Maps?

Different Control Modes of Air Handling Unit (AHU)

Control Modes of Air Handling Unit (AHU) – HVAC Basics

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

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?