Extra-Study/pages/E5C.md

E5C Coordinate systems and phasors in electronics: rectangular coordinates; polar coordinates; phasors; logarithmic axes

• E5C01 (A) Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation? #card
  • A. 0 - j100
  • B. 0 + j100
  • C. 100 - j0
  • D. 100 + j0
• E5C02 (C) How are impedances described in polar coordinates? #card
  • A. By X and R values
  • B. By real and imaginary parts
  • C. By magnitude and phase angle
  • D. By Y and G values
• E5C03 (C) Which of the following represents a pure inductive reactance in polar coordinates? #card
  • A. A positive 45 degree phase angle
  • B. A negative 45 degree phase angle
  • C. A positive 90 degree phase angle
  • D. A negative 90 degree phase angle
• E5C04 (D) What type of Y-axis scale is most often used for graphs of circuit frequency response? #card
  • A. Linear
  • B. Scatter
  • C. Random
  • D. Logarithmic
• E5C05 (C) What kind of diagram is used to show the phase relationship between impedances at a given frequency? #card
  • A. Venn diagram
  • B. Near field diagram
  • C. Phasor diagram
  • D. Far field diagram
• E5C06 (B) What does the impedance 50 - j25 ohms represent? #card
  • A. 50 ohms resistance in series with 25 ohms inductive reactance
  • B. 50 ohms resistance in series with 25 ohms capacitive reactance
  • C. 25 ohms resistance in series with 50 ohms inductive reactance
  • D. 25 ohms resistance in series with 50 ohms capacitive reactance
• E5C07 (D) Where is the impedance of a pure resistance plotted on rectangular coordinates? #card
  • A. On the vertical axis
  • B. On a line through the origin, slanted at 45 degrees
  • C. On a horizontal line, offset vertically above the horizontal axis
  • D. On the horizontal axis
• E5C08 (D) What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive, and/or capacitive reactance? #card
  • A. Maidenhead grid
  • B. Faraday grid
  • C. Elliptical coordinates
  • D. Polar coordinates
• E5C09 (A) When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent? #card
  • A. The X axis represents the resistive component, and the Y axis represents the reactive component
  • B. The X axis represents the reactive component, and the Y axis represents the resistive component
  • C. The X axis represents the phase angle, and the Y axis represents the magnitude
  • D. The X axis represents the magnitude, and the Y axis represents the phase angle
• E5C10 (B) Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 400-ohm resistor and a 38-picofarad capacitor at 14 MHz? #card
  • A. Point 2
  • B. Point 4
  • C. Point 5
  • D. Point 6
• E5C11 (B) Which point in Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and an 18-microhenry inductor at 3.505 MHz? #card
  • A. Point 1
  • B. Point 3
  • C. Point 7
  • D. Point 8
• E5C12 (A) Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz? #card
  • A. Point 1
  • B. Point 3
  • C. Point 7
  • D. Point 8