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Subelement D
Circuits
Section 32
Schematics
Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7?
  • 150 mV
  • 5.5 V
  • -15 mv
  • Correct Answer
    -5.5 V
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Which lamps would be lit in the circuit shown in Figure 3D8?
  • 2, 3, 4, 5 and 6.
  • 5, 6, 8 and 9.
  • Correct Answer
    2, 3, 4, 7 and 8.
  • 1, 3, 5, 7 and 8.
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What will occur if an amplifier input signal coupling capacitor fails open?
  • Correct Answer
    No amplification will occur, with DC within the circuit measuring normal.
  • Improper biasing will occur within the amplifier stage.
  • Oscillation and thermal runaway may occur.
  • An AC hum will appear on the circuit output.
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In Figure 3D9, determine if there is a problem with this regulated power supply and identify the problem.
  • R1 value is too low which would cause excessive base current and instantly destroy TR 1.
  • D1 and D2 are reversed. The power supply simply would not function.
  • TR1 is shown as an NPN and must be changed to a PNP.
  • Correct Answer
    There is no problem with the circuit.
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In Figure 3D10 with a square wave input what would be the output?
  • 1
  • 2
  • Correct Answer
    3
  • 4
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With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display?
  • 1
  • Correct Answer
    2
  • 3
  • 4
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