Analog Electronics
The major advantage of a photo transistor as compared to a photo diode is its

 durability.
 response to higher frequencies.
 AC operation.
  increased sensitivity.

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Analog Electronics
The typical input stage of an opamp has a

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

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