Lakshya Education MCQs

Question: An npn bjt has gm=38ma/v, cµ =10¯14 f, cπ =10¯13f and dc current gain β0=90.for this transistor ft & fβ are
Options:
A. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz
B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
Answer: Option B

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Question 1. An npn bjt has gm=38ma/v, cµ =10¯14 f, cπ =10¯13f and dc current gain β0=90.for this transistor ft & fβ are
  1.     fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz
  2.     fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
  3.     fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
  4.     fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
Answer: Option B
Question 2. Negative feedback in an amplifier
  1.     Reduces gain
  2.     Increase frequency &phase distortion
  3.     Reduces bandwidth
  4.     Increases noise
Answer: Option A
Question 3. Which of the following is not associated with a p-n junction
  1.     Junction capacitance
  2.     Charge storage capacitance
  3.     Depletion capacitance
  4.     Channel length modulation
Answer: Option D
Question 4. Which of the following is not associated with a p-n junction
  1.     Junction capacitance
  2.     Charge storage capacitance
  3.     Depletion capacitance
  4.     Channel length modulation
Answer: Option D
Question 5. If=0.98, ico=6µa and iβ=100µa for a transistor,then the value of ic will be
  1.     2.3mA
  2.     3.2mA
  3.     4.6mA
  4.     5.2mA
Answer: Option D
Explanation :
Question 6. Which of the following is not associated with a p-n junction
  1.     Junction capacitance
  2.     Charge storage capacitance
  3.     Depletion capacitance
  4.     Channel length modulation
Answer: Option D

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