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Analog Electronics

Analog Electronics
When VGS = 0 V, a JFET is

  cut off.
  an open switch.
  saturated.
  an analog device.

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Analog Electronics
The current gain of a bipolar transistor drops at high frequencies because of

The early effect
High current effects in the base
Transistor capacitances
Parasitic inductive elements

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Analog Electronics
In a CB amplifier the maximum efficiency could be

99%
85%
25%
50%

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Analog Electronics
The collector current is 1.5 mA. If the current gain is 50, the base current is

 150 µA.
 3 µA.
 3 mA.
  30 µA.

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Analog Electronics
When a reverse bias is applied to a diode, it will

  lower the potential barrier.
  increases the majority carrier an electric current greatly.
  raise the potential barrier.
  none of these.

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Analog Electronics
Which are the ways to convert an alternating current into a direct current ?

 Bridge Full-wave rectification.
 Center-Taped Full-wave rectification.
 Half-wave rectification.
 All the above.

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