Analog Electronics
Feedback circuit in an oscillator can be accomplished by

 Inductive coupling between input and output
 Any one or combinations of the above methods
 Capacitive coupling between input and output
 Resistive coupling between input and output

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Analog Electronics
A working diode must have

 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased
 High resistance when forward or reverse biased

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