Analog Electronics
The load voltage is approximately constant when a zener diode is

  forward biased.
  reverse biased.
  unbiased.
  operating in breakdown region.

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
High input resistance and low output resistance
Low input resistance as well as output resistance
Medium input resistance and high output resistance

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