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EC6011-Electromagnetic Interference and Compatibility

Analyze the need for electromagnetic compatibility.

Write some of the testing strategies in EMC.

Identify the three criteria to be satisfied by any system to become electromagnetically compatible.

Discuss the steps to prevent emission that causes the EMI in a system.

Why EMI is a vital problem?

We feel electric shock at times, when we touch TV and Computer monitors. Give the reason.

List out types of Electromagnetic emission.

Give the explanation about the conducted coupling of EMI.

Explain why a bike started or a mixie under running condition disturbs a TV receivers functioning.

Where is a decoupling capacitor used? Why?

Illustrate various types of radiation coupling in EMI.

Choose which coupling happens directly between the emitter and receptor.

What is the possibility to develop circuit models of EMI with correct reason?

Criticize on the two factors that tend to affect the amount of interference that would otherwise be transmitted along a conducted path

Define EMI and EMC.

Differentiate conducted and radiated emission.

Classify EMI/EMC and List some of the EMC applications.

Summarize the effect of EMI on secured communications.

What would happen if the coupling path is not properly shielded? Justify

How would you reduce the hazards due to radiation?

(i) Write short notes on EMI Testing categories. (7) (ii) What are the various parameters of measurement? Give their units. (6)

(i) List out all the sources and victims of EMI with examples? (7) (ii) Write the various mechanisms in which electromagnetic interference can travel from its source to the receptor. (6)

(i) Define an intersystem EMI? How does it affect equipment in an EM environment? (7) (ii) Select and write about the case histories related to intersystem EMI. (6)

(i) What is an intra-system EMI? How does it affect equipment in an EM environment? (7) (ii) Recall the case histories related to intersystem EMI.

(i) Distinguish between the features of conducted EMI & radiated EMI(7) (ii) Outline the interference elements present in an EMI system (6)

(i) Give an account on radiation hazards. (7) (ii) Summarize in detail the conducted EMI and radiated EMI with examples.

i) Identify how a conducted emission occurs in an EM environment. (7) (ii) Explain the tests performed for the conducted susceptibility. (6)

(i) Illustrate proper industrial citations to explain the significance of EMI in a system design. (7) (ii) Show how celestial bodies act as a source of EMI.

(i) Select a proper testing methodology for radiation emissions and susceptibility. Explain. (7) (ii) Interpret the lightning discharge as a source of EMI and discuss on t

(i) Analyze how an electrostatic discharge occur. (7) (ii) Investigate on details of how an EMI is caused by radiation Hazards.(6)

(i) Examine the measurement performed for the conducted emission? (7) (ii) Inspect the role of decoupling capacitors in digital IC’s. (6)

Analyze the various issues of EMC in brief. (13)

Consider the past historical facts and criticize on the impact of radio communication. Also discuss how lightning discharges affect the transmission line communication. (13)

Generalize about the noise parameters involved in EMI/EMC. (13)

(i)Evaluate the various sources of Electromagnetic radiation and its hazards. (8) (ii)Examine the effect of radiation on the human body.

(i)Demonstrate the mechanisms of EMI. Mention its applications. (8) (ii)Illustrate the types of EMI with real diagram explain the sources and consequences of EMI. (7)

(i) Explain how EMI is different from RFI. (8) (ii)In What frequency range are (a) Conducted EMI (b) Radiated EMI likely to be predominant. Why? (7)

With Neat diagram explain the sources and consequences of EMI and explain on the types of EMI (15)

List out the types of coupling between cables.

Draw the elements of interference in a basic system with source and receptor.

Define Cross talk.

Describe the effect of cross talk with reference to EMI/EMC design issues.

Express the impacts of electromagnetic emission.

Identify the types of fundamental sources of EMI

What would happen if conductive transfer occurs?

Analyze the drawbacks of various coupling mechanisms.

Discuss on common mode and differential mode radiated field to cable coupling

Point out the important techniques to control EMI at source point.

Define ground coupled interference.

What is transient coupling and factors that influence grounding scheme?

Give suitable explanation for ‘Ground’ with respect to working on electrical gadgets.

Relate the way in which one can avoid power mains interference.

Classify the factors that the noise voltage developed in a closed loop, depend on.

Criticize the need of ground loop coupling.

Explain Automotive transient.

Distinguish power supply and power main coupling.

Recall the reason for skin effect

Justify how the field coupling affects the system?

(i) List out the electromagnetic field sources found in an electromagnetic environment? Explain. (7) (ii) Define coupling. What are the types of coupling encountered in an EM enviro

(i) What is common mode coupling? Show how it affects a system in an electromagnetic environment. (7) (ii) Recall the coupling path and what are the electromagnetic interferenc

(i) Can you recall radiated differential mode coupling? How In what way this is different from the radiated common mode coupling? (7) (i) Explain the capacitive coupling that occurs between the two cables running parallel to each other.

(i) With neat diagrams and scenarios, describe about the inductive coupling supporting. (7)

(ii) Discuss in detail about various EMI coupling modes with CM and DM current measurements. (6)

Analyze different types of coupling models of EMI in detail. (13)

(i) Examine how common mains supply acts as a frequent source of conducted interference. (7) (ii) Develop the scenario which demonstrates the electromagnetic coupling between an emit

(i) Analyze the effects of inductance in a two wire cable system. (7) (ii)Describe the effects of the capacitance that exists between the cables. (6)

(i) List out the is causes of ground loop coupling with explanation. (7) (ii) Show how ground loop coupling affects the grounding in a system that is a part of the electromagnetic environment. (6)

(i) Illustrate in detail the conducted and radiated coupling. (7) (ii) Demonstrate the common impedance ground couplings with examples.

(i) Outline the transient sources? How does the lightning discharge affect the electronic equipment? (7) (ii) Discuss in detail about power supply coupling.

(i) Demonstrate the cable related emissions and coupling briefly. (7) (ii) Summarize on Automotive transients. (6)

(i) Identify how surges occurring on power supply affect the appliances. Explain. (7) (ii) Inspect how the electrostatic discharge affects the digital circuit

(i) Justify the reasons of how the cable coupling, near and far coupling of EM fields produced can be reduced. Also, suggest the ways to enhance the immunity of circuits/equipment/systems. (7) (ii) Evaluate the effe

(i) How an electromagnetic field that appears in the atmosphere does get coupled into the transmission or power cables? Calculate the induced voltage and current due to this coupling action. (7) (ii) Illustrate the elec

Compile the possible modes of coupling in EMC aspects and enumerate the features of the coupling via supply network. (15)

Interpret the effects of following coupling mechanisms with respect to practical scenario. (15) (i)Conducted Coupling (ii)Near field Coupling, (iii)Far Field Coupling

Assess the waveforms generated with respect to transient sources and automotive transients. (15)

Construct proper distribution functions for the following EMI sources(15) (i)Tube light (ii)Automobile ignition (iii)Radar Transmitter

Analyze EMI shielding and its need.

Write Murphy’s Law?

Show the Choice of Materials for shielding.

Define shielding effectiveness.

Formulate the shielding effectiveness of E and H-fields.

Summarize various shielding methods.

Interpret the all the tests that can be carried over in a shielding room.

Examine the need for EMI Gaskets.

Explain the different Gasketting for EMI sealing.

What do you understand from Single point ground system?

Classify the procedures for effective grounding in PCB design

Discuss about the advantages of multipoint grounding.

Chemical Salting has to be repeated for every 2 or 3 years for better grounding effect–Justify.

Illustrate the terms grounding and bonding, opto – isolator?

Categorize EMI filters.

Analyze on ‘bulging’ capacitor?

Formulate the insertion loss of the filter.

Estimate the functionality of transient suppressors.

What are the purposes of Shielding?

Show all the procedures that have to be considered for cable routing.

Discuss the various types of shielding techniques and derive the expression for the attenuation due to single shield and multimedia laminated shield with neat diagram. (13)

(i) Show that electromagnetic leakage occurs through shielding joints. (7) (ii) Suggest the methods to reduce this electromagnetic leakage. (6)

(i)How can a gasket be used to suppress the EM leakage at joints? (7) (ii)Recall on the sealing for EMI leakage. (6)

Illustrate in detail about the different types of system grounding for EMI/EMC. (13)

(i) Describe a filter help in suppressing undesired conducted electromagnetic interference? (7) (ii) Support your answer with the help of lumped element low pass filter.(6)

(i) List out and explain the methods to measure the grounding with examples. (7) (ii) Brief out the preventions to be followed while earthing.

Analyze the factors considered for a telephone line filter design. How does this factor influence the filter design? Explain with necessary examples. (13)

Summarize about various lumped element low pass filters for EMI mitigation. Also compare their performances. (13)

Write notes on Surge protection and suppression, Transient protection and suppression, and Low Frequency (LF) magnetic field shielding. (13)

(i) Assess the two filtering methods to control EMI (7) (ii) What Is an isolation transformer? Briefly describe the function of isolation transformer

(i) Discuss how shielding is done to prevent Magnetic radiation (7) (ii) Compose short notes on Magnetic shielding. (6)

(i) Investigate on how the components election and mounting controls EMI. (7) (ii) Explain about PCB to chassis ground connection and effects

(i) What are all the procedures grounding strategies i) Large systems ii) Mixed signal systems? (7) (ii) Brief about electromagnetic compatibility that is achieved while PCB is pr

(i) Illustrate the consequence of different shielding materials over the shielding. Tabulate some of the shielding materials and their uses. (7) (ii) Demonstrate how does an isolation transformer control EMI? (6)

Determine how can an opto isolator and an EMI gasket control EMI? (15)

Assess the Principles of Grounding. Explain the methods for mixed signal systems. (15)

(i) Develop the strategies used for surge protection. (8) (ii)Explain the precautions used in Earthling. (7)

Illustrate different type of Filter with neat diagram and also, analyze the insertion loss characteristics. (15)

Point out the parameters that involves in Testing and evaluation of EMI/EMC.

What for MILSTD-461, 462 and 463 are used?

Which the FCC limits are for conducted and radiated emissions for class A equipment?

Give any two BSI published standards.

Can High Voltage lines be allowed to cross residential sites? Justify.

Quote the CISPR standards for EMIC.

Illustrate at least two standards for design guidelines and test& measurement procedures published by IEEE/ANSI.

State the objective of requirements CS103/104/105.

Identify the expansion of the terms CISPR, FCC.

Differentiate military and civilian standards.

Propose the Standards for generic products to be used in industrial environments?

Summarize few parameters of MIL461E / 462.

Define IEC and BSI.

Discuss the special requirements of MIL STD 461E for EMC testing?

Interpret the purpose of EMC standards?

Construct the main function of ACEC.

Analyze the key for Conducted Emission (CE) EMC standards?

Prepare the AS/NZS standards?

Assess modular approval standards.

Point out the two types of EMC Product standard.

What does the standard MIL461E emphasize? What are the problems one may face by violating the regulations in it? If possible, a case study be referred to support your justification. (13)

(i) Express the needs to meet for EMI standards? Explain. (7) (ii) Discuss in detail the specifications for emission and susceptibility given in MIL461E standard. (6)

Develop the conducted interference controls, radiated interference controls and susceptibility at intermediate levels of exposure in MIL STD 461/462standard. (13)

(i) Compare Euro norms standards in Japan. (7) (ii) Infer details about EMI specifications and its limits with respect to civilian and military standards. (6)

Analyze the purpose of EMI standards and give different types of standards that followed in different countries? (13)

Distinguish between the FCC’s EMC requirement and the European Union’s EMC requirements? What additional emission requirements does the European Union have that the FCC does not? (13)

Write about Civilian standards FCC, Comite Special des Perturbations Radio electrique (CISPR) and International Electro technical commission (IEC) standards. (13)

Explain in detail about various military standards. (13)

(i) List out the IEC specifications adopted by ANSI standard. (7) (ii) Briefly explain the MIL standards are useful in the area of EMI/EMC. (6)

Summarize FCC and CISPR Conducted Emission (CE) and Radiated Emission (RE) standards. (13)

Write short notes on VDE and Euro norms for EMI/EMC. (13)

(i) Determine the generic standards for residential and industrial environments. (7) (ii) Validate the ACEC standards.

(i) Demonstrate the regulatory model for radiated emissions from electrical equipment. (7) (ii) Show that how US organizations involved with EMC for commercial stan

With specifications explain on electromagnetic emission and susceptibility standards. (13)

Demonstrate the CE, CS, RE, RS limits in military standards. Compare the standards for Class A and Class B devices. (15)

Evaluate the EMI/EMC specifications given in MIL-STD-461 D. (15)

Detail on the CISPR international standardizing organisation and its CE and RE standards (15)

Determine the hierarchy of standards with the needs and explain on the standards followed in different countries (15)

What is LISN?

Why is shielded chamber needed for EMI testing?

Enlist the test methods available to measure the Shielding Effectiveness also give the expression.

Write the advantages Anechoic chamber in EMI measurements.

Assess the Near Field sources in Shielding effectiveness.

List the various measurement precautions in OATS

Develop the block diagram of ESD simulator.

What is the need for coupling/decoupling network and show the basic arrangements.

Identify at least two standards for test &measurement procedures published by IEEE/ANSI.

Compare radiated measurements for class A devices and others.

Formulate the spectrum bandwidth that will be occupied by a radio station

Give some commonly used test antenna and the useful frequency range for each.

State various types of EM modeling methodologies used in signal integrity analysis.

Generalize the requirements of Military STD for EMC testing?

Discuss on how test bed is selected for ESD testing.

With LISN illustrate the basic circuit used for RI measurements

Point out two very important needs for TEM cell.

Develop the equation for the measurement of site attenuation and Antenna Factor (AF).

Summarize the sources of inaccuracies in the TEM cell measurements.

Differentiate Military standard and Civilian standards in measurements.

Give a detailed account on EMI test wave simulators. (13)

(i) Outline the principles of operation of current probe. (7) (ii) Discuss in detail about the functioning of feed through capacitor.(6)

(i) Formulate the various EMI Test instruments. (7) (ii) Develop a test bed for EFT. (6)

(i)Examine the method of measuring site attenuation and antenna factor. (7) (ii) Infer about EMI specifications and its limits with respect to civilian and military standards. (6)

Analyze the construction of an anechoic chamber used for EMI measurement and explain procedure for RE and RS measurement. (13)

(i) Describe about the open area test site measurements. What are its limitations? (7) (ii) Summarize the configurations of open area test site.

Write short notes on Broadband measurement antennas (i) The Bi-conical Antenna (7) (ii) Log-Periodic Antenna (6)

(i) Inspect briefly about the measurements using an anechoic chamber.(7) (ii) Explain about Line Impedance Stabilization Networks. (6)

(i) List out the various equipment used for Conducted EMI. (7) (ii) Recall the MIL-STD test methods useful in the area of EMI/EMC.(6)

(i) Show the various shielding effectiveness test used to determine the level of attenuation of an EMI shield. (7) (ii) Illustrate the construction of the Shielded anechoic chamber. (6)

Write short notes on (i)Measurement of CM and DM Interferences. (7) (ii) Conducted EMI in ships and Aircraft. (6)

(i) Evaluate the source of inaccuracies using anechoic chamber measurements. (7) (ii) Enumerate the measurements using EMI Rx and spectrum analyzer. (6)

Demonstrate TEM cell and discuss any one measurement TEM cell. (13)

(i) Illustrate on the spectrum Analyzer with neat sketch (7) (ii) Construct an EMI coupling network and give its need. (6)

Assess on several test methods to measure shielding effectiveness of a barrier/a sample of material (15)

With neat diagram explain the superhetrodyne spectrum analyzer. Also, create the output waveform with illustrations. (15)

Enumerate the construction of an EMI test receiver. Explain the key features used to design EMI test receiver. (15)

Determine in detail the various MIL STD test Methods and Civilian STD test methods (15)

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