Analog Electronics
The input signal for an instrumentation amplifier usually comes from

 an inverting amplifier.
 a differential amplifier.
 a resistor.
 a Wheatstone bridge.

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Analog Electronics
Pinch-off voltage in a JFET is

 the gate to source voltage that gives unity drain current.
 the drain voltage that gives infinite drain current.
 the drain voltage that gives zero drain current.
 the gate to source voltage that gives zero drain current.

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