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MCQs

Analog Electronics

Total Questions : 482 | Page 6 of 49 pages
Question 51. Thermal runaway is not possible in fet because as the temperature of fet increases
  1.     The mobility decreases
  2.     The transconductance increases
  3.     The drain current increases
  4.     None of the above
 Discuss Question
Answer: Option A. ->  The mobility decreases
Question 52. The action of JFET in its equivalent circuit can best be represented as a
  1.    Current controlled Current source
  2.    Current controlled voltage source
  3.    Voltage controlled voltage source
  4.    voltage controlled current source
 Discuss Question
Answer: Option D. -> voltage controlled current source
Question 53. In a CB amplifier the maximum efficiency could be
  1.    99%
  2.    85%
  3.    50%
  4.    25%
 Discuss Question
Answer: Option D. -> 25%
Question 54. In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at
  1.    The edge of the depletion region on the p-side
  2.    The edge of the depletion region on the n-side
  3.    The p⁺n junction
  4.    The center of the depletion region on the n-side
 Discuss Question
Answer: Option C. -> The p⁺n junction
Question 55. To prevent a DC return between source and load, it is necessary to use
  1.    Resistor between source and load
  2.    Inductor between source and load
  3.    Capacitor between source and load
  4.    Either A or B
 Discuss Question
Answer: Option C. -> Capacitor between source and load
Question 56. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ. At the frequency of 4KHZ,the o/p voltage will be
  1.    1v
  2.    2v
  3.    1.4v
  4.    2.8v
 Discuss Question
Answer: Option B. -> 2v
Question 57. 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
 Discuss Question
Answer: Option D. -> 5.2mA
Question 58. The cascade amplifier is a multistage configuration of
  1.    CC-CB
  2.    CE-CB
  3.    CB-CC
  4.    CE-CC
 Discuss Question
Answer: Option B. -> CE-CB
Question 59. 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
 Discuss Question
Answer: Option D. -> Channel length modulation
Question 60. 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
 Discuss Question
Answer: Option B. -> fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

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