True or false, the high input impedance of a JFET amp prevents it from being used as a buffer?

Question

in practical phase-shift oscillator, each RC circuit produced 60 deg. phase shift true or false

Answer 1

JFETs are used all the time as buffers.  LF356N is a JFET input opamp and we use them all the time.

You need 180 degree phase shift feedback to sustain oscillations.  

Answer 2

1) false

2) true

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