Key Topic 17: Impedance Networks-2

Question 1

3-17B1: What is the impedance of a network composed of a 100-picofarad capacitor in parallel with a 4000-ohm resistor, at 500 kHz? Specify your answer in polar coordinates.

A. 2490 ohms, /51.5 degrees
B. 4000 ohms, /38.5 degrees
C. 5112 ohms, /-38.5 degrees
D. 2490 ohms, /-51.5 degrees

Answer 1

D. 2490 ohms, /-51.5 degrees

Question 2

3-17B2: In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactance inductor in series with a 100-ohm resistor?

A. 121 ohms, /35 degrees
B. 141 ohms, /45 degrees
C. 161 ohms, /55 degrees
D. 181 ohms, /65 degrees

Answer 2

B. 141 ohms, /45 degrees

Question 3

3-17B3: In polar coordinates, what is the impedance of a network composed of a 400-ohm-reactance capacitor in series with a 300-ohm resistor?

A. 240 ohms, /36.9 degrees
B. 240 ohms, /-36.9 degrees
C. 500 ohms, /-53.1 degrees
D. 500 ohms, /53.1 degrees

Answer 3

C. 500 ohms, /-53.1 degrees

Question 4

3-17B4: In polar coordinates, what is the impedance of a network composed of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series?

A. 500 ohms, /37 degrees
B. 400 ohms, /27 degrees
C. 300 ohms, /17 degrees
D. 200 ohms, /10 degrees

Answer 4

A. 500 ohms, /37 degrees

Question 5

3-17B5: In polar coordinates, what is the impedance of a network comprised of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor?

A. 240 ohms, /-36.9 degrees
B. 240 ohms, /36.9 degrees
C. 500 ohms, /53.1 degrees
D. 500 ohms, /-53.1 degrees

Answer 5

B. 240 ohms, /36.9 degrees

Question 6

3-17B6: Using the polar coordinate system, what visual representation would you get of a voltage in a sinewave circuit?

A. To show the reactance which is present.
B. To graphically represent the AC and DC component.
C. To display the data on an XY chart.
D. The plot shows the magnitude and phase angle.

Answer 6

D. The plot shows the magnitude and phase angle.