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ECE :: Analog Electronics

  1. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. Which of the following will increases from this type of operation?

  2. A.
    Stability
    B.
    Bandwidth
    C.
    Distortion
    D.
    Input resistance

  3. For a transistor if adc = 0.98 and emitter current IE is 2 mA, then base current will be

  4. A.
    10 μA
    B.
    40 μA
    C.
    80 μA
    D.
    200 μA

  5. Assertion (A): Linear ICs include audio amplifier, wideband amplifier, RF amplifier and IF amplifier

    Reason (R): The error voltage in a feedback circuit is very small

  6. 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

  7. The given circuit has a feedback factor of


  8. Assertion (A): The horizontal intercept of dc load line is the same as ideal cut off point

    Reason (R): When a transistor is in cut off region, collector current is zero

  9. 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

  10. Which of the following statement is incorrect?

  11. A.
    UJT is a 3-terminal diode having two unequally doped regions
    B.
    A UJT can be triggered by any one of its three terminals
    C.
    The bi-directional switching characteristics of a diac are symmetrical
    D.
    As compared to JFETs, MOSFETs generate less noise in high gain amplifiers

  12. Which circuit is called swamped amplifier?

  13. A.
    CC
    B.
    CE
    C.
    CB
    D.
    Both (a) and (b)

  14. The ripple factor of a power supply is given by

  15. A.
    Pdc/Pac
    B.
    C.
    D.

  16. In a linear op-amp circuit

  17. A.
    the product of gain and bandwidth is constant
    B.
    input can be dc only
    C.
    input can be ac only
    D.
    saturation may occur

  18. In a normally biased N-P-N transistor the main current crossing the collector junction is

  19. A.
    a drift current
    B.
    a hole current
    C.
    a diffusion current
    D.
    same as the base current