# Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E5C: Coordinate systems and phasors in electronics: Rectangular Coordinates; Polar Coordinates; Phasors

2016-E5C01: Which of the following represents a capacitive reactance in rectangular notation?

-jX

+jX

X

Omega

2016-E5C02: How are impedances described in polar coordinates?

By phase angle and amplitude

By X and R values

By real and imaginary parts

By Y and G values

2016-E5C03: Which of the following represents an inductive reactance in polar coordinates?

A positive phase angle

A positive real part

A negative real part

A negative phase angle

2016-E5C04: Which of the following represents a capacitive reactance in polar coordinates?

A negative phase angle

A positive real part

A negative real part

A positive phase angle

2016-E5C05: What is the name of the diagram used to show the phase relationship between impedances at a given frequency?

Phasor diagram

Venn diagram

Near field diagram

Far field diagram

2016-E5C06: What does the impedance 50-j25 represent?

50 ohms resistance in series with 25 ohms capacitive reactance

50 ohms resistance in series with 25 ohms inductive reactance

25 ohms resistance in series with 50 ohms inductive reactance

25 ohms resistance in series with 50 ohms capacitive reactance

2016-E5C07: What is a vector?

A quantity with both magnitude and an angular component

The value of a quantity that changes over time

The inverse of the tangent function

The inverse of the sine function

2016-E5C08: What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?

Polar coordinates

Elliptical coordinates

2016-E5C09: When using rectangular coordinates to graph the impedance of a circuit, what does the horizontal axis represent?

Resistive component

Reactive component

The sum of the reactive and resistive components

The difference between the resistive and reactive components

2016-E5C10: When using rectangular coordinates to graph the impedance of a circuit, what does the vertical axis represent?

Reactive component

Resistive component

The sum of the reactive and resistive components

The difference between the resistive and reactive components

2016-E5C11: What do the two numbers that are used to define a point on a graph using rectangular coordinates represent?

The coordinate values along the horizontal and vertical axes

The magnitude and phase of the point

The sine and cosine values

The tangent and cotangent values

2016-E5C12: If you plot the impedance of a circuit using the rectangular coordinate system and find the impedance point falls on the right side of the graph on the horizontal axis, what do you know about the circuit?

It is equivalent to a pure resistance

It has to be a direct current circuit

It contains resistance and capacitive reactance

It contains resistance and inductive reactance

2016-E5C13: What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?

Rectangular coordinates

Elliptical coordinates

2016-E5C14: Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?

Point 4

Point 2

Point 5

Point 6

2016-E5C15: Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?

Point 3

Point 1

Point 7

Point 8

2016-E5C16: Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?

Point 1

Point 3

Point 7

Point 8

2016-E5C17: Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?

Point 8

Point 1

Point 3

Point 5

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