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# Basic Circuit TheoryRF 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!

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 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

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

a) Integrator

b) Differentiator

c) Divider

d) Multiplier

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