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ECE :: Analog Electronics

  1. Which of the following can be used as a buffer amplifier?

  2. A.
    CE
    B.
    CC
    C.
    CB
    D.
    Both (a) and (c)

  3. The feedback technique employed in the following circuit is

  4. A.
    voltage series feedback
    B.
    current series feedback
    C.
    voltage shunt feedback
    D.
    current shunt feedback

  5. A second order active bandpass filter can be obtained by cascading LP second order filter having higher cut off frequency fOH with a second order HP filter having lower cut off frequency fOL provided

  6. A.
    fOL < fOH
    B.
    fOL > fOH
    C.
    fOH = fOL
    D.
    fOH < 0.5 fOL

  7. In figure the approximate voltages of

  8. A.
    base and emitter are - 8 V and - 7.3 V
    B.
    base and collector are - 8 V and - 5 V
    C.
    collector and emitter are - 5 V and - 7.3 V
    D.
    base, emitter and collector are - 8, - 7.3 and - 5 V

  9. The open loop gain of an amplifier is 50 but likely to decrease by 20% due to various factors. If negative feedback with β = 0.1 is used, the change in gain will be about

  10. A.
    20%
    B.
    2%
    C.
    0.5%
    D.
    0.05%

  11. An increase in ambient temperature means that maximum power rating of transistor

  12. A.
    will increase
    B.
    will decrease
    C.
    may increase or decrease
    D.
    may increase or remain the same

  13. Two CE stages are coupled through a capacitor. To calculate the quiescent base current of the two transistors, the capacitor is treated as

  14. A.
    open circuit
    B.
    short circuit
    C.
    neither (a) nor (b)
    D.
    either (a) or (b)

  15. If it is desired to have low output impedance in an amplifier circuit then we should use

  16. A.
    common collector circuit
    B.
    common base circuit
    C.
    common emitter circuit
    D.
    either (b) or (c)

  17. Generally the gain of a transistor amplifier falls at high frequencies due to the

  18. A.
    internal capacitance of device
    B.
    coupling capacitor at the I/P
    C.
    skin effect
    D.
    coupling capacitor at the O/P