64240-mt----electromagnetic Interference & Compatibility

NR

Code No: 64240/MT

M.Tech. – II Semester Regular Examinations, September, 2008 ELECTROMAGNETIC INTERFERENCE & COMPATIBILITY (Communication Systems) Time: 3hours

Max. Marks:60 Answer any FIVE questions All questions carry equal marks ---

1.a) Define EMI, EMC and EMS. b) What are broadband and Narrowband sources of EMI and explain with examples. 2.a) b)

What are the transients in power supply lines and explain in detail. How do you meet EMC requirements for communication and Radar antennas?

3.a) b)

Explain different design methodologies for EMC. What are various types of EMI coupling paths and explain with suitable diagrams.

4.a) b)

List out the exiting EMC standards used by different countries. Explain general guidelines for error-free emission measurements.

5.a) b)

Write a short notes on EMI gaskets. What is GTEM cell? Differentiate it from Archaic chamber.

6.a)

Define shielding effectiveness and explain the phenomenon of multiple in thin shields. Describe a few types of shield discontinuities.

b) 7.a) b) 8.a) b)

What are common mode and differential mode noises and explain how power line filters are used for measuring common mode and differential mode noises. Describe various types of cabling techniques Mention the guidelines used during PCB design for EMC. Write a short notes on zoning. x-x-x