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ECE :: Analog Electronics

  1. The action of JFET in its equivalent circuit can best be represented as a

  2. A.

     Current controlled Current source

    B.

     Current controlled voltage source

    C.

     Voltage controlled voltage source

    D.

     voltage controlled current source


  3. In a CB amplifier the maximum efficiency could be

  4. A.

     99%

    B.

     85%

    C.

     50%

    D.

     25%


  5. In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at

  6. A.

     The edge of the depletion region on the p-side

    B.

     The edge of the depletion region on the n-side

    C.

     The p⁺n junction

    D.

     The center of the depletion region on the n-side


  7. To prevent a DC return between source and load, it is necessary to use

  8. A.

     Resistor between source and load

    B.

     Inductor between source and load

    C.

     Capacitor between source and load

    D.

     Either A or B


  9. 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

  10. A.

     1v

    B.

     2v

    C.

     1.4v

    D.

     2.8v


  11. If=0.98, Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be

  12. A.

     2.3mA

    B.

     3.2mA

    C.

     4.6mA

    D.

     5.2mA


  13. Which of the following is not associated with a p-n junction

  14. A.

     Junction capacitance

    B.

     Charge storage capacitance

    C.

     Depletion capacitance

    D.

     Channel length modulation


  15. The cascade amplifier is a multistage configuration of

  16. A.

     CC-CB

    B.

     CE-CB

    C.

     CB-CC

    D.

     CE-CC


  17. 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

  18. 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


  19. Negative feedback in an amplifier

  20. A.

     Reduces gain

    B.

     Increase frequency &phase distortion

    C.

     Reduces bandwidth

    D.

     Increases noise