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CSE :: Electronic Principles

  1. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

  2. A.
    60 Ohm
    B.
    99.3 Ohm
    C.
    250 Ohm
    D.
    70.7Ohm
    E.
    None of the above

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  3. Current can flow through a normally open push button switch as long as:

  4. A.
    you are pressing the button
    B.
    you are not pressing the button
    C.
    its contact remain open
    D.
    its contact remain open
    E.
    None of the above

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  5. Doubling the operating frequency of a purely capacitive circuit:

  6. A.
    has no effect on the total circuit current
    B.
    doubles the amount of total current
    C.
    cuts the total current by one-half
    D.
    thrice the amount of total current
    E.
    None of the above

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  7. How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?

  8. A.
    0.151 mA
    B.
    157 raA
    C.
    0.995 mA
    D.
    2.02 A
    E.
    None of the above

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  9. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

  10. A.
    28.4 mA
    B.
    24.2 mA
    C.
    34.4 mA
    D.
    68.4 mA
    E.
    None of the above

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  11. The total capacitance of a series capacitor circuit is:

  12. A.
    equal to the sun of the individual capacitive-reactance values
    B.
    equal to the sum of the individual capacitance values
    C.
    equal to the source voltage divided by total current
    D.
    less than the value of the smallest capacitor
    E.
    None of the above

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  13. Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?

  14. A.
    200 W
    B.
    1000 W
    C.
    20 W
    D.
    100 W
    E.
    None of the above

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  15. To get the Thevenin voltage, you have to

  16. A.
    Short the load resistor
    B.
    Open the load resister
    C.
    Short the voltage source
    D.
    Open the voltage source
    E.
    None of the above

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  17. Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?

  18. A.
    Reluctance
    B.
    Permeability
    C.
    Permeance
    D.
    Retentivity
    E.
    There is no valid comparison

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

  20. 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

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