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Saturday, September 17, 2011

Electronics interview questions




  1. When transmitting digital signals is it necessary to transmit some harmonics in addition to fundamental frequency?
  2. For asynchronous transmission, is it necessary to supply some synchronizing pulses additionally or to supply or to supply start and stop bit?
  3. BPFSK is more efficient than BFSK in presence of noise. Why?
  4. What is meant by pre-emphasis and de-emphasis?
  5. Explain 3 dB cutoff frequency? Why is it 3 dB, not 1 dB?
  6. Explain ASCII, EBCDIC?

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