Electronic Devices and circuits Theory-Diode Applications Questions and Answers

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Q11
Which statement best describes an insulator?
  • A A material with many free electrons.
  • B A material doped to have some free electrons.
  • C A material with few free electrons.
  • D No description fits.
Answer: Option C
Q12
Effectively, how many valence electrons are there in each atom within a silicon crystal?
  • A 2
  • B 4
  • C 8
  • D 16
Answer: Option C
Q13
The boundary between p-type material and n-type material is called
  • A a diode.
  • B a reverse-biased diode.
  • C a pn junction.
  • D a forward-biased diode.
Answer: Option C
Q14
You have an unknown type of diode in a circuit. You measure the voltage across it and find it to be 0.3 V. The diode might be
  • A a silicon diode.
  • B a germanium diode.
  • C a forward-biased silicon diode.
  • D a reverse-biased germanium diode.
Answer: Option B
Q15
An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward-biased.
  • A open, short
  • B short, open
  • C open, open
  • D short, short
Answer: Option A
Q16
A reverse-biased diode has the ________ connected to the positive side of the source, and the ________ connected to the negative side of the source.
  • A cathode, anode
  • B cathode, base
  • C base, anode
  • D anode, cathode
Answer: Option A
Q17
What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon?
  • A bivalent
  • B octavalent
  • C pentavalent
  • D trivalent
Answer: Option C
Q18
What factor(s) do(es) the barrier potential of a pn junction depend on?
  • A type of semiconductive material
  • B the amount of doping
  • C the temperature
  • D all of the above
Answer: Option D
Q19
An atom is made up of
  • A protons.
  • B neutrons.
  • C electrons.
  • D all of the above
Answer: Option D
Q20
Reverse breakdown is a condition in which a diode
  • A is subjected to a large reverse voltage.
  • B is reverse-biased and there is a small leakage current.
  • C has no current flowing at all.
  • D is heated up by large amounts of current in the forward direction.
Answer: Option A

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