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ECE :: Analog Electronics

  1. In an amplifier the voltage gain is the ratio of

  2. A.
    output voltage and emitter resistance
    B.
    output voltage and input current
    C.
    output voltage and input voltage
    D.
    none of the above

  3. The critical frequency of the circuit of figure is


  4. Find resistance RB to bring transistor to threshold of saturation VCB = 0, VBE = 0.7 V, a = 0.96

  5. A.
    1.5 kΩ
    B.
    15 kΩ
    C.
    10 kΩ
    D.
    1 kΩ

  6. In figure ID = 4 mA. Then VGS =

  7. A.
    4.4 V
    B.
    -4.4 V
    C.
    0.44 V
    D.
    -0.44 V

  8. A typical value of gm for a FET is about 25 μs.

  9. A.
    True
    B.
    False

  10. The dissipation at the collector is in the quiescent state and increases with excitation in the case of a

  11. A.
    class A series fed Amplifier
    B.
    class A transistor coupled Amplifier
    C.
    class AB amplifier
    D.
    class B amplifier

  12. In following circuit, RB will be if VCC = 10 V, VS = 2 V, RC = 5 kΩ, RS = 90 kΩ, β = 50, ICE = 0, VCEsat = 0.1 V

  13. A.
    230 K
    B.
    235 K
    C.
    240 K
    D.
    250 K

  14. The open loop gain of an ideal op-amp is

  15. A.
    infinite
    B.
    very high
    C.
    neither high nor low
    D.
    low

  16. In following figure, what will be R1 and R2 for maximum symmetrical swing if VCSat ≈ 0. Given that RE = 200 Ω, RC = 400 Ω, VCC = 20 V, β = 99

  17. A.
    6 k
    B.
    3 k, 6 k
    C.
    9.9 k, 2.4 k
    D.
    2.4 k, 9.9 k

  18. The ideal characteristics of a stabilizer is

  19. A.
    constant output voltage with low internal resistance
    B.
    constant output current with low internal resistance
    C.
    constant output voltage with high internal resistance
    D.
    constant internal resistance and constant output current