Analog Electronics
Suppose the base resistor is open. The Q point will be

 off the load line.
  at the lower end of the load line.
 at the upper end of the load line.
 in the middle of the load line.

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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 single - ended output.
  differential input and differential output.

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