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CSE :: Electronic Principles

  1. A low-pass filter:

  2. A.
    passes lower-frequency signals and reduces higher-frequency signals
    B.
    passes higher-frequency signals and reduces lower-frequency signals
    C.
    has no effect on ac signals
    D.
    reduces the level of all frequencies by a significant amount
    E.
    None of the above

  3. What is one important thing transistors do?

  4. A.
    Emit light
    B.
    Amplify weak signals
    C.
    Regulate voltage
    D.
    Rectify line voltage
    E.
    None of the above

  5. At room temperature an intrinsic silicon crystal acts approximately like

  6. A.
    a battery
    B.
    a conductor
    C.
    an insulator
    D.
    a piece of copper wire
    E.
    None of the above

  7. When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:

  8. A.
    parallel RL circuit
    B.
    parallel RC circuit
    C.
    parallel RLC circuit operated above its resonant frequency
    D.
    purely resistive circuit
    E.
    None of the above

  9. What causes the depletion layer?

  10. A.
    Doping
    B.
    Recombination
    C.
    Barrier potential
    D.
    Ions
    E.
    None of the above

  11. Which one of the following statements most accurately reflects the nature of ac power?

  12. A.
    The current in an ac circuit flows in one direction, but changes value periodically
    B.
    The current in an ac circuit flows in one direction at a steady level
    C.
    The current in an ac circuit changes direction periodically
    D.
    The current in an ac circuit flows in two directions at the same time
    E.
    None of the above

  13. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

  14. A.
    700 V
    B.
    707 V
    C.
    651 V
    D.
    208 V
    E.
    None of the above

  15. Which one of the following principles best describes the basic operation of a generator?

  16. A.
    Like magnetic poles repel; unlike poles attract
    B.
    Current is induced in a conductor that is moving through a magnetic field
    C.
    Like magnetic poles attract; unlike poles repel
    D.
    Current flowing through a conductor generates a magnetic field
    E.
    None of the above

  17. The current gain of a transistor is defined as the ratio of the collector current to the

  18. A.
    base current
    B.
    emitter current
    C.
    supply current
    D.
    collector current
    E.
    None of the above

  19. What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?

  20. A.
    220 ohm
    B.
    150 ohm
    C.
    445 ohm
    D.
    690 ohm
    E.
    None of the above