Analog Electronics
The typical input stage of an opamp has a

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

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Analog Electronics
The magnitude of electric current ICBO

  is generally greater in silicon than in germanium transistor.
  depends largely upon the emitter doping.
  increases with the increase in temperature.
  depends largely upon emitter-base junction base potential.

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Analog Electronics
A working diode must have

 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 Low resistance when forward or reverse biased

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