Analog Electronics
A small collector current with zero base current is caused by the leakage current of the

 emitter diode.
 base diode.
 transistor.
  collector diode.

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

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

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