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

 emitter diode.
  collector diode.
 base diode.
 transistor.

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and differential output.
  differential input and single - ended output.
  differential input and differential output.
  single - ended input and single-ended output.

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  the emitter junction has high resistance.
  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.

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