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ECE :: Analog Electronics

  1. Assertion (A): In the circuit shown figure the diode is used to protect the active devices. Transistor T goes into saturation when a positive pulse is applied at base and non conducting

    Reason (R): When the current in an inductor is suddenly stopped, a high voltage is induced across it.

  2. 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

  3. When the ac input signal is very large the instantaneous operating point CE amplifier moves all the way between

  4. A.
    ac saturation and ac cut off points
    B.
    ac operating and ac cut off points
    C.
    ac saturation and ac operating points
    D.
    none of the above

  5. For full wave rectification four diode bridge rectifier is claimed to have following advantages:

    1. Less expensive transformer
    2. Small size transformer
    3. Suitable for higher voltage applications
    Which of these are correct?

  6. A.
    1 and 2 only
    B.
    1 and 3 only
    C.
    2 and 2 only
    D.
    1, 2, 3

  7. Following figure is a signal conditioning Amplifier, changes gain depending upon the polarity of Vs. What will be circuit voltage gain for + Vs and for - Vs if D2 is ideal.

  8. A.
    AV = -R3/R1
    B.
    R3/R1
    C.
    R1/R3
    D.
    1 + R3/R1

  9. Which class of amplifiers operates with least distortion?

  10. A.
    Class A
    B.
    Class B
    C.
    Class C
    D.
    Class AB

  11. In a full wave diode rectifier circuit each diode carries current for

  12. A.
    90° in each cycle
    B.
    180° in each cycle
    C.
    270° in each cycle
    D.
    360° in each cycle

  13. When a JFET is cut off, it's like an __________ switch and when it is saturated, it's like a __________ switch.

  14. A.
    closed, open
    B.
    open, closed
    C.
    open, open
    D.
    closed, closed

  15. The mobility of e- for Ge and Si respectively is

  16. A.
    1.66, 2.5
    B.
    2.5, 1.66
    C.
    2.7, 2.33
    D.
    2.33, 2.7

  17. If a capacitor C is charged by a constant current I, then the rate of change of voltage with time given by sweep speed equal to

  18. A.
    C/I
    B.
    IC
    C.
    I/C
    D.