Basic Circuit Theory
RF Cafe Quiz #19

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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.