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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Basic Circuit Theory
RF Cafe Quiz #19

All RF Cafe Quizzes make great 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. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

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 V_pk-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 Integrating

6. What is the configuration of the opamp shown here?

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

RF Cafe: Transformer

7. 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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Basic Circuit TheoryRF Cafe Quiz #19

Basic Circuit Theory
RF Cafe Quiz #19