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ECE :: Analog Electronics

  1. Assuming VCE sat = 0.2 V and β = 50, the minimum base current (IB) required to drive the transistor in the given figure to saturation is

  2. A.
    56 μA
    B.
    140 μA
    C.
    60 μA
    D.
    3 μA

  3. A half wave diode rectifier uses a diode having forward resistance of 50 ohms. The load resistance is also 50 ohms. Then the voltage regulation is

  4. A.
    20%
    B.
    50%
    C.
    100%
    D.
    200%

  5. A Hartley oscillator is used for

  6. A.
    very low frequencies
    B.
    radio frequencies
    C.
    micro wave frequencies
    D.
    audio frequency

  7. In Class C operation the collector current looks like

  8. A.
    full sine wave
    B.
    half sine wave
    C.
    narrow pulses
    D.
    nearly half sine wave

  9. An op-amp integrating circuit uses

  10. A.
    an inductor
    B.
    a capacitor
    C.
    both inductor and capacitor
    D.
    none of the above

  11. In the op-amp circuit given in the figure, the load current iL is


  12. A CE amplifier has re = 6 Ω, β = 100 and a = 0.98. The input impedance is

  13. A.
    6 Ω
    B.
    100 Ω
    C.
    600 Ω
    D.
    98 Ω

  14. A full wave diode rectifier using centre tapped transformer has diodes with forward resistance of 50 ohms each. The load resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulation is

  15. A.
    20%
    B.
    50%
    C.
    100%
    D.
    200%

  16. Leakage current approximately doubles for every 10°C increase in the temperature of a transistor has ICBO = 400 nA at 25°C, then its leakage current at 80°C

  17. A.
    10 μA
    B.
    18 μA
    C.
    20 μA
    D.
    15 μA

  18. A CB amplifier has IE = 3.5 mA, a = 0.98 and RL = 600 Ω. The input impedance

  19. A.
    0.98 Ω
    B.
    0.025 Ω
    C.
    D.
    600 Ω