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ECE :: Analog Electronics

  1. Class A and Class B power amplifiers predominate at

  2. A.
    audio frequencies
    B.
    radio frequencies
    C.
    all frequencies
    D.
    audio and radio frequency

  3. In a class C operation VCC = 30 V and VCE(sat) = 2 V. The efficiency is

  4. A.
    93.75%
    B.
    88%
    C.
    6.66%
    D.
    3.33%

  5. In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is

  6. A.
    9 kΩ
    B.
    6 kΩ
    C.
    3 kΩ
    D.
    2 kΩ

  7. A voltage tripler circuit uses

  8. A.
    2 diodes and 2 capacitors
    B.
    3 diodes and 3 capacitors
    C.
    2 diodes and 3 capacitors
    D.
    3 diodes and 2 capacitors

  9. An op-amp uses

  10. A.
    RC coupling
    B.
    direct coupling
    C.
    transformer coupling
    D.
    either (b) or (c)

  11. In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.

  12. A.
    True
    B.
    False

  13. One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be

  14. A.
    sinusoidal
    B.
    full rectified sinusoidal
    C.
    half rectified sinusoidal
    D.
    square wave

  15. 3N 200 is a

  16. A.
    semi-conductor diode
    B.
    P-N-P transistor
    C.
    dual gate MOSFET
    D.
    UJT

  17. The A.C. resistance of the emitter diode will be

  18. A.
    5.05 Ω
    B.
    50.5 Ω
    C.
    505 Ω
    D.
    5050 Ω

  19. For a transistor amplifier with self biasing network, the following components are used. R1 = 4 kΩ, R2 = 4 kΩ, RC = 1 kΩ. The approximate value of the stability factor 'S' will be

  20. A.
    4
    B.
    3
    C.
    2
    D.
    1.5