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Electronics and Communication Materials And Components Difficulty: Medium

In a feedback control system, phase margin (PM) is: 1. Directly proportional to ξ 2. Inversely proportional to ξ 3. Independent of ξ 4. Zero when ξ = 0 Which of the above statements are correct? Which thing is more dominant in making a fiber function as a bidirectional optical amplifier? How many mechanisms are there which causes absorption? What will be the period and frequency of oscillation for an astable multivibrator, given the following specifications? R 1 = 1 kΩ R 2 = 5.6 kΩ C 1 = 0.01 µF C 2 = 0.03 µF The modal noise can be reduced by . . . . . . . .