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ECE :: Analog Electronics

  1. For an op-amp source follower circuit

  2. A.
    input and output voltages have same magnitude
    B.
    output and input voltages are in phase
    C.
    output and input voltages are in phase but have different magnitudes
    D.
    output and input voltages have same magnitude and are in phase

  3. In CE approximation, the upper end of d.c. load line is called the __________ point and the lower end is the __________ point.

  4. A.
    Q, base
    B.
    base, Q
    C.
    saturation, cut off
    D.
    cut off, saturation

  5. In a class C power amplifier

  6. A.
    resonant frequency of tuned circuit is equal to fundamental frequency of pulsed waveform
    B.
    resonant frequency of tuned circuit is half the fundamental frequency of pulsed waveform
    C.
    resonant frequency of tuned circuit has no relation to the fundamental frequency of pulsed waveform
    D.
    either (b) or (c)

  7. A low noise device is most important

  8. A.
    at front end of equipment
    B.
    in the last stage of equipment
    C.
    in the middle stages of equipment
    D.
    both (b) and (c)

  9. How many cascaded stage of CE amplifiers will result in polarity inversion of the input signal?

  10. A.
    Two
    B.
    Three
    C.
    Four
    D.
    None

  11. Circuit shown in the figure is

  12. A.
    astable multivibrator
    B.
    monostable multivibrator
    C.
    VCO
    D.
    ramp Generator

  13. The gain of a source follower is unity.

  14. A.
    True
    B.
    False

  15. In a transistor, current ICBO flow when

  16. A.
    some D.C. voltage is applied in the reverse direction to the emitter junction with the collector open circuit
    B.
    some D.C. voltage is applied in the forward direction to the collector junction with the emitter open circuit
    C.
    some D.C. voltage is applied in the reverse direction to the collector junction with the emitter open circuited
    D.
    some D.C. voltage is applied in the forward direction to the emitter junction with the collector open circuited

  17. The D.C. alpha(a) of a transistor is approximately

  18. A.
    unity
    B.
    10 to 50
    C.
    100 to 500
    D.
    1000 to 5000

  19. The period of oscillation of a symmetrical multivibrator depends upon the discharging time constant and is roughly given by

  20. A.
    T = 1.4 RC
    B.
    C.
    T = 1.4 RC
    D.
    T = 1.4 RC