Analog Electronics
Darlington connection is achieved in 2 transistors by connecting

 both base.
 both emitter.
 grounding both collector.
 both collector.

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Analog Electronics
The typical input stage of an opamp has a

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

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Analog Electronics
For an NPN transistor in normal bias

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

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