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ECE :: Analog Electronics

  1. Which of the following amplifier circuits has highest input impedance?

  2. A.
    Circuit using BJT
    B.
    Circuit using JFET
    C.
    Circuit using MOSFET
    D.
    Either (a) or (b)

  3. Which of the following device acts as an N-P-N and a P-N-P transistor connected base to base and emitter to controller?

  4. A.
    UJT
    B.
    SCR
    C.
    Diac
    D.
    Triac

  5. A differentiating amplifier has capacitor in the input path.

  6. A.
    True
    B.
    False

  7. Which of the following statement about TRIAC is incorrect?

  8. A.
    It is not particularly suited to A.C. or mains power control
    B.
    Any one of its main terminals can be used either as cathode or as anode
    C.
    It can be triggered in response to both positive and negative gate terminals
    D.
    None of the above

  9. A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are

  10. A.
    100 Hz and 50 Hz
    B.
    50 Hz and 100 Hz
    C.
    100 Hz each
    D.
    50 Hz each

  11. Tuned amplifiers are used at radio frequencies.

  12. A.
    True
    B.
    False

  13. The knee voltages in silicon and germanium diodes respectively are

  14. A.
    0.3 V and 0.7 V
    B.
    0.7 V and 0.3 V
    C.
    0.7 V each
    D.
    0.3 V each

  15. In calculating input impedance, the load impedance is considered to be connected at the output.

  16. A.
    True
    B.
    False

  17. In a transistor βdc is likely to vary between 100 and 400. The proper value of βdc to be used to located Q point is

  18. A.
    100
    B.
    400
    C.
    250
    D.
    200

  19. Which of the following noise becomes of great importance at high frequencies?

  20. A.
    Shot noise
    B.
    Agitation noise
    C.
    Flicker noise
    D.
    Transit time noise