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ECE :: Analog Electronics

  1. Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are

  2. A.
    320 Ω, 10 mA
    B.
    400 Ω, 15 mA
    C.
    400 Ω, 10 mA
    D.
    320 Ω, 15 mA

  3. The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be

  4. A.
    200
    B.
    40.12
    C.
    4.878
    D.
    2.2

  5. In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

  6. A.
    50%
    B.
    25%
    C.
    2.5%
    D.
    0.25%

  7. In figure as the load resistance is changed

  8. A.
    the zener current remain constant
    B.
    the load current remains constant
    C.
    the output voltage remains constant
    D.
    the output voltage and current through R remain constant

  9. In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is

  10. A.
    1 mA
    B.
    0.93 mA
    C.
    2 mA
    D.
    1.86 mA

  11. A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is

  12. A.
    83.33 μ sec
    B.
    1 μ sec
    C.
    0.1 m sec
    D.
    3.5 m sec

  13. Feedback factor may be less or more than 1.

  14. A.
    True
    B.
    False

  15. An RC oscillator uses

  16. A.
    one RC combination
    B.
    two RC combinations
    C.
    at least three RC combinations
    D.
    either (a) or (b)

  17. The main advantage of CMOS circuit is

  18. A.
    high gain
    B.
    high output impedance
    C.
    low power consumption
    D.
    high gain and high output impedance

  19. Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum

  20. A.
    when the phase difference between the inputs is 0°
    B.
    when the phase difference between the inputs in 90°
    C.
    when the phase difference between the inputs is 180°
    D.
    when the phase difference between the inputs is 0 or 180°