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MAHALAKSHMI
ec2351 Measurements and instrumentation VI Sem ECE ,AP/ECE Page 1 MAHALAKSHMI ENGINEERING COLLEGE TIRUCHIRAPALLI 621213 QUESTION BANK DEPARTMENT: ECE SEMESTER: IV Subject code / Name: ec2351 / measurement and instrumentation UNIT-III SIGNAL GENERATORS AND ANALYZERS PART A 1. What is Barkhausen Criteria for sustained oscillation? (APRIL/MAY 2011) 2. Draw the block diagram of spectrum analyzer. (APRIL/MAY 2011) ec2351 Measurements and instrumentation VI Sem ECE ,AP/ECE Page 2 3. What is intermodulation distortion? (Nov/DEC 2012) Intermodulation or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies in a system with nonlinearities. The intermodulation between each frequency component will form additional signals at frequencies that are not just at harmonic frequencies (integer multiples) of either, but also at the sum and difference frequencies of the original frequencies and at multiples of those sum and difference frequencies.
EC2351–Measurements and Instrumentation VI Sem ECE – R.Vanitha,AP/ECE Page 6 Rise time : It is the time required for a pulse to rise from 10 to 90% of its normal /final amplitude.
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