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ECE :: Analog Electronics

  1. Negative feedback in amplifier

  2. A.
    reduces gain
    B.
    increases frequency and phase distortion
    C.
    reduces bandwidth
    D.
    increases noise

  3. Which of the following is the fastest switching device?

  4. A.
    JFET
    B.
    BJT
    C.
    MOSFET
    D.
    Triode

  5. Which of the following is not valid in case of bipolars?

  6. A.
    It has a low input impedance
    B.
    It has high voltage gain
    C.
    It is a current controlled device
    D.
    It is difficult to bias

  7. The input resistance of JFET ideally approaches

  8. A.
    zero
    B.
    1 ohm
    C.
    100 ohm
    D.
    infinity

  9. In the analysis of common emitter amplifier we may neglect

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

  11. The ac input voltage of an amplifier

  12. A.
    is always equal to ac signal voltage
    B.
    may be equal to or more than ac signal voltage
    C.
    is always less than ac signal voltage
    D.
    may be equal or more or less than ac signal voltage

  13. Assertion (A): Negative feedback reduces the gain of an amplifier

    Reason (R): Negative feedback is very commonly used in amplifier circuits

  14. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

  15. In figure the coordinates of Q point on the load line are (Neglect VBE)

  16. A.
    IC = 10 mA, VCE = 15 V
    B.
    IC = 5 mA, VCE = 22.5 V
    C.
    IC = 5 mA, VCE = 15 V
    D.
    IC = 10 mA, VCE = 22.5 V

  17. In the re model of a BJT amplifier, the ac resistance of diode at room temperature is about (IE is quiescent emitter current)


  18. The emitter resistor RE in the emitter of CE amplifier stabilizes the dc operating point against variation in

  19. A.
    temperature only
    B.
    β of transistor
    C.
    both temperature and β
    D.
    none of the above