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PN JUNCTION DIODE MCQs

Total Questions : 25 | Page 2 of 3 pages
Question 11. When PN junction is in forward bias, by increasing the battery voltage
  1.    Circuit resistance increases
  2.    Current through P-N junction increases
  3.    Current through P-N junction decreases
  4.    None of the above happens
 Discuss Question
Answer: Option B. -> Current through P-N junction increases
Question 12. A forward biased pn junction diode has a resistance of the order of
  1.    Ω
  2.    kΩ
  3.    MΩ
  4.    Gelien Sales
 Discuss Question
Answer: Option A. -> Ω
Question 13. The displacement of the charges results in
  1.    Magnetic field
  2.    Electric field
  3.    Rust
  4.    Hall effect
 Discuss Question
Answer: Option B. -> Electric field
Question 14. Zener diodes are mostly used for
  1.    rectifier circuits
  2.    Filter Circuits
  3.    solar cells
  4.    Voltage regulator circuits
 Discuss Question
Answer: Option D. -> Voltage regulator circuits
Question 15. When the diode is forward biased, it is equivalent to
  1.    An off switch
  2.    An On switch
  3.    A high resistance
  4.    None of the above
 Discuss Question
Answer: Option B. -> An On switch
Question 16. Which of the following is true in case of an unbiased p-n junction diode?a) b) c)
  1.    Diffusion of electrons & holes goes on infinitely
  2.    Charges establish an electric field across the junctions
  3.    There is zero electrical potential across the junctionsd)
  4.    Diffusion does not take place
 Discuss Question
Answer: Option B. -> Charges establish an electric field across the junctions
Question 17. Peak inverse voltage for full wave rectifier
  1.    2 VS
  2.    Vs
 Discuss Question
Answer: Option A. -> 2 VS
Question 18. The depletion region consists of
  1.    Nothing but minority carriers
  2.    Positive and negative ions
  3.    No majority carrier
  4.    (ii) and (iii)
 Discuss Question
Answer: Option D. -> (ii) and (iii)
Question 19. The arrow direction in the diode symbol indicates
  1.    Direction of electron flow
  2.    Direction of hole flow (Direction of conventional current)
  3.    Opposite to the direction of hole flow
  4.    None of the above
 Discuss Question
Answer: Option B. -> Direction of hole flow (Direction of conventional current)
Question 20. Characteristics of a diode that helps in rectification
  1.    Allows Unidirectional flow of current
  2.    Allows Bidirectional flow of current
  3.    Opposes the flow of current
  4.    conducts in reverse biased
 Discuss Question
Answer: Option A. -> Allows Unidirectional flow of current

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