Analog Electronics
Which of following is not an essential element of a DC power supply?

  Rectifier.
  Voltage regulator.
  Voltage amplifier.
  Filter.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.
  in the forward direction to the emitter junction with collector open.

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