Home / ECE / Analog Electronics :: Section 19

ECE :: Analog Electronics

  1. The changes in ambient temperature affect the open loop gain of amplifier.

  2. A.
    True
    B.
    False

  3. In a JFET, the lower end is called the __________ and the upper end is called the __________ .

  4. A.
    source, channel
    B.
    channel, drain
    C.
    source, drain
    D.
    drain source

  5. A semi-conductor device that behaves like two SCRs is

  6. A.
    UJT
    B.
    MOSFET
    C.
    JFET
    D.
    TRIAC

  7. As compared to a BJT amplifier circuit, a JFET amplifier circuit

  8. A.
    has low input impedance
    B.
    has high input impedance
    C.
    has very low input impedance
    D.
    may have either low or high input impedance

  9. In an oscillator the total phase shift around the loop must be

  10. A.
    180°
    B.
    90°
    C.
    270°
    D.

  11. Which of the following parameters of CE circuit has the unit of ohms?

  12. A.
    hie
    B.
    hre
    C.
    hfe
    D.
    hoe

  13. In the op-amp circuit shown in figure the current through load resistance RL is


  14. Whenever a JFET operates above pinch-off voltage

  15. A.
    depletion regions become smaller
    B.
    drain current increase steeply
    C.
    drain current starts decreasing
    D.
    drain current remains nearly constant

  16. A Weinbridge oscillator is a

  17. A.
    VHF oscillator
    B.
    RF oscillator
    C.
    microwave oscillator
    D.
    audio frequency oscillator

  18. RC network shown in the given figure can provide a maximum theoretical phase shift of

  19. A.
    90°
    B.
    180°
    C.
    270°
    D.
    360°