Electronic Devices and circuits Theory-Diode Applications Questions and Answers

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Q21
There is a small amount of current across the barrier of a reverse-biased diode. This current is called
  • A forward-bias current.
  • B reverse breakdown current.
  • C conventional current.
  • D reverse leakage current.
Answer: Option D
Q22
As the forward current through a silicon diode increases, the voltage across the diode
  • A increases to a 0.7 V maximum.
  • B decreases.
  • C is relatively constant.
  • D decreases and then increases.
Answer: Option C
Q23
Doping of a semiconductor material means
  • A that a glue-type substance is added to hold the material together.
  • B that impurities are added to increase the resistance of the material.
  • C that impurities are added to decrease the resistance of the material.
  • D that all impurities are removed to get pure silicon.
Answer: Option C
Q24
The forward voltage across a conducting silicon diode is about
  • A 0.3 V.
  • B 1.7 V.
  • C –0.7 V.
  • D 0.7 V.
Answer: Option D
Q25
The most common type of diode failure is a(n) ________.
  • A open
  • B short
  • C resistive
  • D [NIL]
Answer: Option A
Q26
What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?
  • A doping
  • B recombination
  • C generation
  • D [NIL]
Answer: Option B
Q27
The maximum number of electrons in each shell of an atom is
  • A 2.
  • B 2n2 where n is the number of the shell.
  • C 4.
  • D 8.
Answer: Option B
Q28
A silicon diode is forward-biased. You measure the voltage to ground from the anode at ________, and the voltage from the cathode to ground at ________.
  • A 0 V, 0.3 V
  • B 2.3 V, 1.6 V
  • C 1.6 V, 2.3 V
  • D 0.3 V, 0 V
Answer: Option B
Q29
The term bias in electronics usually means
  • A the value of ac voltage in the signal.
  • B the condition of current through a pn junction.
  • C the value of dc voltages for the device to operate properly.
  • D the status of the diode.
Answer: Option C
Q30
A reverse-biased silicon diode has about 0.7 V across it.
  • A TRUE
  • B FALSE
Answer: Option B

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