QUE BANK - EMIC

DHANALAKSHMI SRINIVASAN SRINIVASAN ENGINEERING COLLEGE, PERAMBALUR  DEPARTMENT OF ECE EC6011 ELECTROMAGNETIC INTERFERENCE AND COMPATIBILITY COMPATIBILITY QUESTION BANK 

UNIT I BASIC THEORY: THEORY:  PART  PART A:

1. Analyze the need for electromagnetic compatibility. 2. Write some of the testing strategies in EMC. 3. Identi Identify fy the three three criter criteria ia to be satisf satisfied ied by any system system to become become electr electromag omagnet netical ically ly compatible. 4. isc!ss the steps to pre"ent emission that ca!ses the EMI in a system. #. Why is EMI a "ital problem$ %. We feel electric shoc& at times' (hen (e to!ch )* and Comp!ter monitors. +i"e the reason. ,. -ist the so!rces of EMI . +i"e the e/planation abo!t the cond!cted co!pling of EMI. 0. E/plain (hy a bi&e started or a mi/ie !nder r!nning condition co ndition dist!rbs a )* 1. Where is a deco!pling capacitor ca pacitor !sed$ Why$ 11. Ill!strate "ario!s types of radiation co!pling in EMI. 12. Choose (hich co!pling happens directly bet(een the emitter and receptor. 13. What is the possibility to de"elop circ!it models of EMI (ith correct reason. 14. Criticiz Criticizee on the t(o factor factorss that that tend tend to affect affect the amo!nt amo!nt of interf interfere erence nce that that (o!ld (o!ld other(ise be transmitted along a cond!cted path. 1#. efine EMI and EMC. 1%. -ist some of the EMC applications. 1,. Classify EMIEMC. 1. !mmarize the effect of EMI on sec!red comm!nications. 10. What (o!ld happen if the co!pling path is not properly shielded$ !stify 2. 5o( can the hazards d!e to radiation be red!ced or pre"ented$

 PART B:

1. Write short notes on EMI )esting categories. 617 2. What are the "ario!s parameters of meas!rement$ +i"e their rele"ant !nits. 6%7 3. -ist o!t all the so!rces and "ictims of EMI$ 6%7 4. Write notes on each so!rces and "ictims (ith e/amples. 617 #. What is an intersystem EMI$ 5o( does it affect e8!ipment in an EM en"ironment$ 67 %. elect and (rite abo!t the case histories related to intersystem EMI. 67 ,. What is an intrasystem EMI$ 5o( does it affect e8!ipment in an EM en"ironment$ 67 . Write abo!t the case histories related to intersystem EMI. 67 0. isting!ish bet(een the feat!res of cond!cted EMI and radiated EMI.67 1. E/plain the interference elements present in an EMI system. 67 11. +i"e an acco!nt on radiation hazards. 67 12. E/plain in detail the cond!cted EMI and radiated EMI (ith e/amples. 67 13. Identify ho( a cond!cted emission occ!rs in an EM en"ironment. 67 14. E/plain the tests performed for the cond!cted s!sceptibility. 67 1#. Ill!strate proper ind!strial citations to e/plain the significance of EMI in a system design. 67 1%. ho( ho( celestial bodies act as a so!rce of EMI. 67 1,. elect a proper testing methodology for 9adiation emissions and s!sceptibility. E/plain. 67 1. Interpret the lightning discharge as a so!rce of EMI. 67 10. Analyze ho( an electrostatic discharge occ!rs. 67 2. In"estigate on details of ho( an EMI is ca!sed by radiation 5azards.67 21. E/plain the meas!rement performed for the cond!cted emission$ 67 22. E/amine the role of eco!pling capacitors in digital IC:s. 67 23. Analyze the "ario!s iss!es of EMC in brief. 6%7 24. 5o( does the cond!ction emission occ!r in (itched mode po(er s!pply$ isc!ss abo!t the common mode noise in M;. 617 2#. Consider the past historical facts. Criticize on the impact of radio comm!nication. Also disc!ss the role of electromagnetic s!sceptibility and compatibility in it. 61%7 2%. +enerate s!itable e/amples to e/plain the intentional and !nintentional electromagnetic emissions d!ring operation of "ario!s e8!ipments. 5o( to con trol them$ 61%7 UNIT II COUPLING MECHANISMS:  PART A:

1. 2. 3. 4. #. %. ,. .

-ist o!t the types of co!pling bet(een cables. efine +ro!nd co!pled Interference. ra( the elements of interference in a basic system (ith so!rce and receptor. What is transient co!pling$ ra( common mode and differential mode co!pling in circ!its. escribe the effect of cross tal& (ith reference to EMIEMC design iss!es. +i"e s!itable e/planation for <+ro!nd: (ith respect to (or&ing on electrical gadgets. E/press the impacts of electromagnetic emission.

0. isc!ss the (ay by (hich one can a"oid po(er mains interference. 1. Ill!strate the steps in the proced!re to analyze EM; s!sceptibility. 11. What (o!ld happen if cond!cti"e transfer occ!rs$ 12. Classify the factors that the noise "oltage de"eloped in a closed loop' depend on. 13. Criticize the need of gro!nd loop co!pling. 14. E/plain a!tomoti"e transient. 1#. Analyze the dra(bac&s of "ario!s co!pling mechanisms. 1%. E/plain po(er s!pply and po(er main co!pling. 1,. Combine the effect of radiation and cond!ction co!pling and disc!ss its effect. 1. efine -I=. 10. ;oint o!t the important techni8!es to control EMI at so!rce point. 2. E/plain ho( the field co!pling affects the system$  PART B: 1. What is the electromagnetic field so!rces fo!nd in an electromagnetic en"ironment$

isc!ss. 67 2. efine co!pling. What are the types of co!pling enco!ntered in an EM en"ironment$ isc!ss. 67 3. efine co!pling path. What are the electromagnetic interferences that occ!r in the co!pling path$ 67 4. What is common mode co!pling$ ho( ho( it affects a system in an electromagnetic en"ironment$ 67 #. efine radiated differential mode co!pling$ 5o( In (hat (ay this is different from the radiated common mode co!pling$ 67 %. What are transient so!rces$ 5o( does the lightning discharge affect the electronic e8!ipments$ 67 ,. What is gro!nd loop co!pling$ tate the ca!ses of gro!nd loop co!pling. 6%7 . ho( ho( it affects the gro!nding in a system that is a part of the electromagnetic en"ironment. 617 0. Ill!strate in detail the cond!cted and radiated co!pling. 67 1. emonstrate the common impedance gro!nd co!plings (ith e/amples 67 11. Ill!strate the effect of cross tal& in a three cond!ctor transmission line. 67 12. isc!ss in detail abo!t po(er s!pply co!pling. 67 13. escribe the cable related emissions and co!pling briefly. 67 14. !mmarize on A!tomoti"e transients. 67 1#. escribe abo!t the Ind!cti"e co!pling s!pporting (ith neat diagrams and scenarios. 67 1%. E/plain ho( the Electrostatic discharge affects the digital circ!its and control panels. 67 1,. E/plain the Capaciti"e co!pling that occ!rs bet(een the t(o cables r!nning parallel to each other. 67 1. Identify ho( s!rges occ!rring on main po(er s!pply affect the appliances. E/plain. 67 10. E/plain the concept behind Cross tal& (ith help of ;C> in detail. 67

2. Analyze ho( a co!pling ta&es place in a s!pply net(or& and ho( does it affect the net(or&. 67 21. E/plain ho( common mains s!pply acts as a fre8!ent so!rce of cond!cted interference. 67 22. Ill!strate the electromagnetic impact of cable co!pling in a system design. 67 23. Analyze the effects of ind!ctance in a t(o (ire cable system. 67 24. escribe the effects of the capacitance that e/ists bet(een the cables. 67 2#. !stify the reasons of ho( the cable co!pling' near and far co!pling of EM fields  prod!ced can be red!ced. Also' s!ggest the (ays to enhance the imm!nity of  circ!itse8!ipments systems. 67 2%. E"al!ate the effects of radiati"e co!pling in an EM en"ironment. 67 2,. 5o( an electromagnetic field that appears in the atmosphere does gets co!pled into the transmission or po(er cables$ Calc!late the ind!ced "oltage and c!rrent d!e to this co!pling action. 67 2. e"elop the scenarios (hich demonstrate the electromagnetic co!pling bet(een an emitter and a receptor. !pport it (ith neat diagrams. 67 UNIT III EMI MITIGATION TECHNIQUES:  PART A 1. Analyze EMI shielding and its need. 2. What is M!rphy:s -a($ 3. -ist the Choice of Materials for shielding. 4. efine shielding effecti"eness. #. ?orm!late the shielding effecti"eness of E and 5 fields. %. !mmarize "ario!s shielding methods. ,. Interpret the all the tests that can be carried o"er in a shielding room. . E/plain the need for EMI +as&ets. 0. ;oint o!t the different +as&etting for EMI sealing. 1. -ist o!t the co!pling sit!ations to be addressed d!ring the physical layo!t process. 11. Classify the proced!res for effecti"e gro!nding in ;C> design 12. isc!ss abo!t the ad"antages of m!ltipoint gro!nding. 13. Chemical alting has to be repeated for e"ery 2 or 3 years for better gro!nding effect @ 

!stify. 14. Ill!strate the terms gro!nding and bonding. 1#. Classify EMI filters. 1%. What is meant by
1. isc!ss the shielding mechanism and deri"e the e/pression for the atten!ation d!e to 2. 3. 4. #. %. ,.

single shield and m!ltimedia laminated shield (ith neat diagrams and e8!ations. 61%7 ho( that the electromagnetic lea&age occ!rs thro!gh shielding oints. 6%7 !ggest the methods to red!ce this electromagnetic lea&age. 617 5o( can a gas&et be !sed to s!ppress the EM lea&age at oints$ 67 Write notes on sealing for EMI lea&age. 67 E/plain in detail abo!t the different types of system gro!nding for EMIEMC. 61%7 escribe a filter help in s!ppressing !ndesired cond!cted electromagnetic interference$

67 . !pport yo!r ans(er (ith the help of l!mped element lo( pass filter. 67 0. !mmarize on the methods to meas!re the gro!nd resistance. 67 1. >rief o!t the pre"entions to be follo(ed (hile earthing. 67 11. Analyze the factors considered for a telephone line filter design. 5o( does this factor  infl!ence the filter design$ E/plain (ith necessary e/amples. 61%7 12. !mmarize abo!t "ario!s l!mped element lo( pass filter schemes for EMI mitigation. Also compare their performances. 61%7 13. Write notes on 6i7 !rge protection and s!ppression 6ii7 )ransient protection and s!ppression 6ii7 -o( ?re8!ency 6-?7 magnetic field shielding 6#7B6#7B6%7 14. )he insertion loss of a partic!lar filter depends on the so!rce and load impedances' and therefore cannot be stated independently of the termination impedances.D !stify the abo"e statement and pro"e it n!merically. Also determine the insertion loss at 1# &5z and 3 M5z for a differential mode and common mode. 61%7 1#. ?or a 9esidential po(er distrib!tion system' analyze the re8!irements and the steps to design a safety gro!nding system considering the t(o (ires and three (ires gro!nding scenario. 61%7 1%. In"estigate on ho( the component selection and mo!nting controls EMI.6%7 1,. E/plain abo!t ;C> to chassis gro!nd connection and effects of apert!res. 617 1. What are all the proced!res !sed for effecti"e gro!nding in ;C> design$ 67 10. >rief abo!t electromagnetic compatibility that is achie"ed (hile ;C> is prepared for  ind!stry applications. 67 2. Ill!strate the conse8!ence of different shielding materials o"er the shielding. )ab!late some of the shielding materials and their !ses.67 21. emonstrate the shielding integrity at discontin!ities. 67 UNIT IV STANDARDS AND REGULATION   PART A: 1. 2. 3. 4.

-ist o!t the EMIEMC ci"ilian standards. What for MI- ) 4%1' 4%2 and 4%3 are !sed$ Which are the class A de"ices (ith reference to ?CC$ +i"e the reason (hy CI;9 standards e"ol"ed.

5. Can 5igh *oltage lines be allo(ed to cross residential sites$ !stify. 6. !ote the CI;9 standards for EMIC. ,. Ill!strate at least t(o standards for design g!idelines and test F meas!rement proced!res

 p!blished by IEEEA=I. . tate the obecti"e of re8!irements C 13141#. 0. Identify the e/pansion of the terms CI;9' ?CC. 1. ifferentiate military and ci"ilian standards. 11. ;ropose the tandards for generic prod!cts to be !sed in ind!strial en"ironments$ 12. !mmarize fe( parameters of MI- 4%1E  4%2. 13. efine IEC and >I. 14. isc!ss the special re8!irements of MI- ) 4%1E for EMC testing$ 1#. Interpret the need for EMI standards$ 1%. Constr!ct the main f!nction of ACEC. 1,. Analyze the &ey for Cond!cted Emission 6CE7 EMC standards$ 1. ;repare the A=G standards$ 10. Assess mod!lar appro"al standards. 2. ;oint o!t the t(o types of EMC ;rod!ct standard.  PART B:

1. What does the standard MI- 4%1E emphasize$ What are the problems one may face by "iolating the reg!lations in it$ If possible' a case st!dy be referred to s!pport yo!r   !stification. 61%7 2. E/press the needs to meet for EMI standards$ E/plain. 67 3. isc!ss briefly of ?CC reg!lations. 67 4. e"elop the cond!cted interference controls' radiated interference controls and s!sceptibility at intermediate le"els of e/pos!re in MI- ) 4%14%2 standard. 61%7 #. Compare E!ro norms standards in apan. 67 %. Infer details abo!t EMI specifications and its limits (ith respect to ci"ilian and military standards. 67 ,. Analyze the p!rpose of EMI standards and gi"e different types of standards that follo(ed in different co!ntries$ 61%7 . isting!ish bet(een the ?CC:s EMC re8!irement and the E!ropean Hnion:s EMC re8!irements$ What additional emission re8!irements does the E!ropean Hnion ha"e that the ?CC does not$ 61%7 0. Write abo!t Committee pecial des ;ert!rbations 9adio electri8!e 6CI;97 and International Electro technical Commission 6IEC7 standards. 6B7 1. E/plain in detail the !sage of A=I standards in EMC area F ;oint o!t (hy military standards are more stringent for 9E and 9. 61%7 11. -ist o!t the IEC specifications adopted by A=I standard. >riefly e/plain the MIstandards are !sef!l in the area of EMIEMC. 61%7

12. !mmarize ?CC and CI;9 Cond!cted Emission 6CE7 and 9adiated Emission 69E7 standards. 61%7 13. Write short notes on 6i7 >ritish tandard Instit!tion 6>I7 F Committee E!ropean de  =ormalization Electro techni8!es 6CE=E-EC7.6B7 14. etermine the generic standards for residential and ind!strial en"ironments F "alidate the *E standards and p!lsed interference imm!nity. 61%7 1#. emonstrate the reg!latory model for radiated emissions from electrical e8!ipment. 67 1%. ho( that ho( H organizations in"ol"ed (ith EMC for commercial standards. 67 1,. Ill!strate on ho( the spectr!m conser"ation can be achie"ed thro!gh proper fre8!ency assignment. 61%7 UNIT V EMI TEST METHODS AND INSTRUMENTATION   PART A: 1. 2. 3. 4. #. %. ,.

ra( t(o arrangements of A). What are the ad"antages of A)$ -ist the feat!res of c!rrent probe and po(er probe. Ill!strate the significance of narro( band testing. Assess the =ear ?ield so!rces in hielding effecti"eness. -ist the "ario!s meas!rement preca!tions in A). Ill!strate at least t(o standards for design g!idelines and test F meas!rement proced!res

 p!blished by IEEEA=I. . What is a )EM Cell$ 0. Identify atleast t(o standards for test Fmeas!rement proced!res p!blished by IEEEA=I. 1. Compare radiated meas!rements for class A de"ices and others. 11. ?orm!late the spectr!m band(idth that (ill be occ!pied by a radio station 12. +i"e the list of antenna !sed for micro(a"e fre8!encies. 13. tate the recommended ambient conditions for air discharge mode testing. 14. +eneralize the re8!irements of Military ) for EMC testing$ 1#. isc!ss on ho( test bed is selected for E testing. 1%. With -I= ill!strate the basic circ!it !sed for 9I meas!rements. 1,. ;oint o!t t(o "ery important needs for )EM cell. 1. e"elop an e8!ation for spectral efficiency that depends on the !sef!l information from the radio e8!ipment. 10. !mmarize the commonly !sed test antennas (ith fre8!ency. 2. ifferentiate Military standard and Ci"ilian standards in meas!rements.  PART B:

1. 2. 3. 4.

Write short notes on sensorsInectors. 67 Write short notes on co!plers. 67 E/press the needs to meet for EMI standards for testing methods. 67 isc!ss briefly abo!t E test bed. 67

#. %. ,. .

?orm!late the "ario!s EMI )est instr!ments. 67 e"elop a test bed for E?). 67 Compare E!ro =orms standards in apan.67 Infer details abo!t EMI specifications and its limits (ith respect to ci"ilian and military

standards for meas!rements. 67 0. Analyze the schematic that enables the meas!rements !sing Anechoic chamber. 67 1. E/plain ho( testing is performed in an open en"ironment. 67 11. escribe abo!t the open area test site meas!rements. What are its limitations$67 12. !tline the characteristics of open area test site. 67 13. Write short notes on >roadband meas!rement antennas a7 )he >iconical Antenna 67  b7 -ogJ;eriodic Antenna 67 14. E/plain briefly abo!t the meas!rements !sing an anechoic chamber. 67 1#. E/plain abo!t -ine Impedance tabilization =et(or&s. 67 1%. -ist o!t the "ario!s e8!ipment !sed for Cond!cted EMI 6%7 1,. E/plain briefly the MI-J) test methods !sef!l in the area of EMIEMC. 617 1. What do yo! mean by shielding$ E/plain the =ear ?ield so!rces in hielding Effecti"eness. 617 10. Write a note on hielded anechoic chamber. 6%7 2. Write short notes on 6i7 Meas!rement of CM and M Interferences 6ii7 Cond!cted EMI in ships and Aircraft. 61%7 21. etermine "ario!s testing antenna and their fre8!encies as specified in CI;9 standard. 67 22. En!merate the meas!rements !sing EMI 9/ and spectr!m analyzer. 67 23. emonstrate the reg!latory model for radiated emissions from electrical e8!ipment. 67 24. 5o( do yo! perform testing !sing +iga 5ertz )EM Cell$ 67 2#. Ill!strate on ho( the spectr!m conser"ation can be achie"ed thro!gh proper fre8!ency assignment. 617 2%. >!ild EMI co!pling net(or&. 6%7