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Basic Circuit Theory
RF Cafe Quiz #19

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All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job.

Some of these books used in quizzes are available as prizes in the monthly RF Cafe Giveaway.

Note: Many answers contain passages quoted from the text.



This particular quiz tests your knowledge of basic circuit theory. Choose the best answer for the spirit of the quiz; i.e., the one that represents the newer term or the abandoned definition.



1. Which circuit law states that the sum of all currents into and out of a node equals zero?

a) Norton's Current Law
b) Chebyshev's Current Law
c) Kirchhoff's Current Law
d) Lenz's Current Law



2. How much power is dissipated by an ideal 100 pF capacitor fed by a 1 Vpk-pk sinewave at 10 MHz? Hint: Z = 1/(2πfC)

a) 12.5 mW
b) 6.28 mW
c) 1.0 mW
d) 0 mW



3. What causes a ground current loop?

a) A coil of wire
b) A open ground point
c) More than one ground potential in a circuit
d) A single ground potential in a circuit



4. What type of filter does this circuit represent?

a) Highpass
b) Lowpass
c) Bandpass
d) Bandstop



5. How many poles does the filter in Q4 have?

a) 4
b) 2
c) 1
d) 0



Operational Amplifier OpAmp Integrating6. What is the configuration of the opamp shown here?

a) Integrator
b) Differentiator
c) Divider
d) Multiplier



RF Cafe: Transformer7. What is the secondary voltage of this transformer?
a) 20 V
b) 10 V
c) 5 V
d) 2 V

8. What is the impedance of the transformer secondary in Q7?

a) 100 Ω
b) 20 Ω
c) 10 Ω
d) 4 Ω



9. In an ideal system, what is the minimum sampling rate to prevent aliasing of a signal with a
    maximum frequency of 100 kHz?

a) 1 MHz
b) 200 kHz
c) 100 kHz
d) 10 kHz



10. Which type of diode typically has the lowest forward bias voltage for a given current?

a) Gallium Arsenide (GaAs)
b) Germanium (Ge)
c) Silicon (Si)
d) Silicon Schottky


Need some help? Click here for the answers and explanations.

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