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EEE :: FET(Field Effect Transistors)

  1. The gate voltage in a JFET at which drain current becomes zero is called ___________ voltage

  2. A.

     saturation

    B.

     pinch-off

    C.

     active

    D.

     cut-off


  3. The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve

  4. A.

     pentode

    B.

     tetrode

    C.

     triode

    D.

     diode


  5. The constant-current region of a JFET lies between

  6. A.

     cut off and saturation

    B.

     cut off and pinch-off

    C.

     o and IDSS

    D.

     pinch-off and breakdown


  7. A JFET has high input impedance because ___________

  8. A.

     it is made of semiconductor material

    B.

     input is reverse biased

    C.

     of impurity atoms

    D.

     none of the above


  9. A MOSFET differs from a JFET mainly because ___________

  10. A.

     of power rating

    B.

     the MOSFET has two gates

    C.

     the JFET has a pn junction

    D.

     none of the above


  11. If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ___________

  12. A.

     is decreased

    B.

     is increased

    C.

     remains the same

    D.

     none of the above


  13. If the gate of a JFET is made less negative, the width of the conducting channel ___________

  14. A.

     remains the same

    B.

     is decreased

    C.

     is increased

    D.

     none of the above


  15. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ___________

  16. A.

     is increased

    B.

     is decreased

    C.

     remains the same

    D.

     none of the above


  17. In a certain common source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is ___________

  18. A.

     1

    B.

     11.4

    C.

     8.75

    D.

     3.2


  19. In a certain CS JFET amplifier, RD= 1kΩ , RS= 560Ω , VDD=10V and gm= 4500 µS. If the source resistor is completely bypassed, the voltage gain is ___________

  20. A.

     450

    B.

     45

    C.

     2.52

    D.

     4.5