IC1401 Computer Control Process B.E Question Bank : niceindia.com
Name of the College : Noorul Islam College of Engineering
University : Anna University
Degree : B.E
Department : Electronics and Instrumentation Engineering
Subject Code/Name : IC 1401 – Computer Control Process
Document Type : Question Bank
Website : niceindia.com
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/niceindia.com/3011-IC_1401_Computer_Control_Process.pdf
NICE Computer Control Process Question Bank
Two Marks Questions :
1. State the theoretical properties required for a digital control algorithm? :
Open loop characteristics, reset problems, controller tuning, robustness, constraint handling, dead time compensation, working with right half plane.
Related : Noorul Islam College of Engineering ME1008 Robotics B.E Question Bank : www.pdfquestion.in/3024.html
2. State deadbeat algorithm? :
An algorithm that requires the closed loop response to havefinite setting time, minimum rise time and zero steady state error is referred to as a dead beat algorithm.
3. Give the advantages and disadvantages of dead beat algorithm? :
Advantages
Control specification is simple
Disadvantage
Existence of ringing.
Closed loop response is likely to deviate from the specification due to inertia present in the industrial scale processing and modeling errors.
4. State dahlin algorithm? :
Dahlin’s algorithm specifies that the closed loop sampled data control system behave as through it were a first order process with dead time.
6. Give the disadvantages of dahlin algorithm? :
The only dis advantages of dahlin algorithm is it is unsuitable for process with inverse response due to the choice of N-(N+1)
7. Give the difference between position and velocity algorithm? :
The difference between the position and velocity algorithm only computes the incremental output computes the incremental output instead of actual output ofthe controller.
8. Write the features of a digital PID controller :
**Eliminate of reset windup.
**Eliminate of derivative kick.
**Effect of saturation on controller performances.
**Comparison of position and velocity algorithm.
**Time delay compensation.
9.Explain ringing? :
When the roots of the denominator D(Z), transfer function contains a term whose coefficient is positive then it implies the presence of a pole of negative value, thus the controller ringing is caused.
10.How can ringing be avoided? :
It can be eliminated by multiplying the transfer function with the ringing term and then multiplying the term to the denominator by applying a limit Z->1
11. State the conditions when a controller is said to be physically unrealiasable? :
If the process contains a time delay then D(Z) will require future values of the error to determine the current values of controller value of controller output which is physically impossible when this occurs the controller is said to be physically unrelisable.
12. Define robustness of a digital control algorithm? :
The control algorithm must have the ability to maintain stability of the control system in the presence of a plant model mismatch
13. What is sampler and hold? :
A sampler is used for the purpose od ADC it converts the continuous signal into a descrete signal of samples. A hold is similar to a DAC but the output is a continuous signal in pulsed form.
1.Define SCADA?
Supervisory Control And Data Acquisition system is computerized hardware and software based project that provides a single integrated view of all control and information resources, enable engineers, supervisors, managers, operators to view and interact with the working of an entire operation through graphical representation of their product process.
2.What is CIMPLICITY?
CIMPLICITY is a SCADA package. It is based on a client-server architecture consisting of servers and viewers. Servers are responsible for the collection and distribution of data. Viewers connect into servers and have full access to the collected data for viewing and control actions.
3.State the requirements of CIMPLICITY HMI plant edition?
CIMPLICITY HMI Plant Edition provides an extraordinary selection of features that enables to configure comprehensive and robust project. It gives a quick tour which provides links to the related subject in the documentation.
4.What is a DDC?
The DDC(Direct Digital Control) directly interface to the process for data acquisition and control purposes.
5.List the tasks performed by microprocessor in DDC?
• It reads the various variables from different transmitters through multiplexer and ADC.
• It determines the error for each control loop and executes control strategy for each loop.
• It outputs the correction value of control valve through DAC.
6.Mention the two algorithm used in DDC software?
There are two algorithms for programming a three mode PID control loop
• Position algorithm
• Velocity algorithm
7.Define AI?
Artificial Intelligence has been defined as the branch of computer science which deals with the software and hardware techniques to solve symbolic problems as against ‘number crunching’ problems solved by EDP machines.
8.What is heuristics?
The learned facts, experience and institution are three basic inputs which enable decision making collectively these are known as heuristics. In AI systems the decisions are taken on the basis of heuristics.
9.Mention the various categories under the AI system.
• Natural language system
• Perception system
• Expert or knowledge based system
10.List the various types of information presented to expert system.
The information presented to the expert system may be factual, incomplete, judgmental, speculative, experimental, uncertain, fuzzy and intuitive. Expert system should derive conclusions based on such incomplete information just like real life human expert.