Diodes and Applications Questions and Answers

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Q11
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:
  • A there is a shorter time between peaks
  • B there is a longer time between peaks
  • C the larger the ripple, the better the filtering action
  • D none of the above
Answer: Option A
Q12
Testing a good diode with an ohmmeter should indicate
  • A high resistance when forward or reverse biased
  • B low resistance when forward or reverse biased
  • C high resistance when reverse biased and low resistance when forward biased
  • D high resistance when forward biased and low resistance when reverse biased
Answer: Option C
Q13
The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:
  • A half the peak secondary voltage
  • B twice the peak secondary voltage
  • C the peak value of the secondary voltage
  • D four times the peak value of the secondary voltage
Answer: Option C
Q14
Electrons in the outermost orbit or shell of an atom are called
  • A free electrons
  • B negative ions
  • C valence electrons
  • D conduction band electrons
Answer: Option C
Q15
Shunting the ac component away from the load is the task of a:
  • A transformer
  • B filter
  • C regulator
  • D rectifier
Answer: Option B
Q16
A pn junction allows current flow when
  • A the p-type material is more positive than the n-type material
  • B the n-type material is more positive than the p-type material
  • C both the n-type and p-type materials have the same potential
  • D there is no potential on the n-type or p-type materials
Answer: Option A
Q17
When a diode is forward biased, the voltage across it
  • A is directly proportional to the current
  • B is inversely proportional to the current
  • C is directly proportional to the source voltage
  • D remains approximately the same
Answer: Option D
Q18
Why is heat produced in a diode?
  • A due to current passing through the diode
  • B due to voltage across the diode
  • C due to the power rating of the diode
  • D due to the PN junction of the diode
Answer: Option A
Q19
The arrow in the schematic symbol of a diode points to
  • A the n-type material, which is called the anode
  • B the n-type material, which is called the cathode
  • C the p-type material, which is called the anode
  • D the p-type material, which is called the cathode
Answer: Option C
Q20
The diode schematic arrow points to the:
  • A trivalent-doped material
  • B positive axial lead
  • C anode lead
  • D cathode lead
Answer: Option D

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