Analog Electronics
A D - MOSFET is considered to be a

  normally off device.
  current controlled device.
  normally on device.
  high - power switch.

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Analog Electronics
The typical input stage of an opamp has a

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

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