Electronics-Diodes and Applications

Electronics-Diodes and Applications
11. A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:
  • there is a shorter time between peaks
  • there is a longer time between peaks
  • the larger the ripple, the better the filtering action
  • none of the above
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12. Testing a good diode with an ohmmeter should indicate
  • high resistance when forward or reverse biased
  • low resistance when forward or reverse biased
  • high resistance when reverse biased and low resistance when forward biased
  • high resistance when forward biased and low resistance when reverse biased
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13. The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:
  • half the peak secondary voltage
  • twice the peak secondary voltage
  • the peak value of the secondary voltage
  • four times the peak value of the secondary voltage
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14. Electrons in the outermost orbit or shell of an atom are called
  • free electrons
  • negative ions
  • valence electrons
  • conduction band electrons
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15. Shunting the ac component away from the load is the task of a:
  • transformer
  • filter
  • regulator
  • rectifier
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16. A pn junction allows current flow when
  • the p-type material is more positive than the n-type material
  • the n-type material is more positive than the p-type material
  • both the n-type and p-type materials have the same potential
  • there is no potential on the n-type or p-type materials
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17. When a diode is forward biased, the voltage across it
  • is directly proportional to the current
  • is inversely proportional to the current
  • is directly proportional to the source voltage
  • remains approximately the same
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18. Why is heat produced in a diode?
  • due to current passing through the diode
  • due to voltage across the diode
  • due to the power rating of the diode
  • due to the PN junction of the diode
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19. The arrow in the schematic symbol of a diode points to
  • the n-type material, which is called the anode
  • the n-type material, which is called the cathode
  • the p-type material, which is called the anode
  • the p-type material, which is called the cathode
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20. The diode schematic arrow points to the:
  • trivalent-doped material
  • positive axial lead
  • anode lead
  • cathode lead
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Electronics
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