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EEE :: FET(Field Effect Transistors)

  1. The two important advantages of a JFET are ___________

  2. A.

     high input impedance and square-law property

    B.

     inexpensive and high output impedance

    C.

     low input impedance and high output impedance

    D.

     none of the above


  3. In a JFET, IDSS is known as ___________

  4. A.

     drain to source current

    B.

     drain to source current with gate shorted

    C.

     drain to source current with gate open

    D.

     none of the above


  5. A MOSFET is sometimes called ___________ JFET

  6. A.

     many gate

    B.

     open gate

    C.

     insulated gate

    D.

     shorted gate


  7. In a common source JFET amplifier, the output voltage is ___________

  8. A.

     in phase with the input

    B.

     taken at the source


  9. A CS JFET amplifier has a load resistance of 10 kΩ , RD= 820° . If gm= 5mS and Vin= 500 mV, the output signal voltage is ___________

  10. A.

     2.05 V

    B.

     25 V

    C.

     0.5 V

    D.

     1.89 V


  11. In a FET, there are ___________ pn junctions at the sides

  12. A.

     three

    B.

     four

    C.

     five

    D.

     two


  13. The input impedance of a MOSFET is of the order of ___________

  14. A.

     O

    B.

     a few hundred O

    C.

     kΩ

    D.

     several MO


  15. A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________

  16. A.

     the voltage gain will increase

    B.

     the transconductance will increase

    C.

     the voltage gain will decrease

    D.

     the Q-point will shift


  17. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is ___________

  18. A.

     20 mA

    B.

     0 mA

    C.

     40 mA

    D.

     10 mA


  19. The gate of a JFET is ___________ biased

  20. A.

     reverse

    B.

     forward

    C.

     reverse as well as forward

    D.

     none of the above