# General Class License Exam Questions

### Subelement G5

Electrical Principles

#### Groups

Question Display Options:

Group G5A
Reactance; inductance; capacitance; impedance; impedance matching

G5A01
What is impedance?

G5A02
What is reactance?

G5A03
Which of the following causes opposition to the flow of alternating current in an inductor?

G5A04
Which of the following causes opposition to the flow of alternating current in a capacitor?

G5A05
How does an inductor react to AC?

G5A06
How does a capacitor react to AC?

G5A07
What happens when the impedance of an electrical load is equal to the output impedance of a power source, assuming both impedances are resistive?

G5A08
Why is impedance matching important?

G5A09
What unit is used to measure reactance?

G5A10
What unit is used to measure impedance?

G5A11
Which of the following describes one method of impedance matching between two AC circuits?

G5A12
What is one reason to use an impedance matching transformer?

G5A13
Which of the following devices can be used for impedance matching at radio frequencies?

Group G5B
The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations

G5B01
What dB change represents a two-times increase or decrease in power?

G5B02
How does the total current relate to the individual currents in each branch of a purely resistive parallel circuit?

G5B03
How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load?

G5B04
How many watts of electrical power are used by a 12 VDC light bulb that draws 0.2 amperes?

G5B05
How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms resistance?

G5B06
What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

G5B07
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?

G5B08 Question Removed by QPC
What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?

G5B09
What is the RMS voltage of a sine wave with a value of 17 volts peak?

G5B10
What percentage of power loss would result from a transmission line loss of 1 dB?

G5B11
What is the ratio of peak envelope power to average power for an unmodulated carrier?

G5B12
What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 watts?

G5B13
What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts?

G5B14
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output?

Group G5C
Resistors, capacitors, and inductors in series and parallel; transformers

G5C01
What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

G5C02
What happens if you reverse the primary and secondary windings of a 4:1 voltage step down transformer?

G5C03
Which of the following components should be added to an existing resistor to increase the resistance?

G5C04
What is the total resistance of three 100 ohm resistors in parallel?

G5C05
If three equal value resistors in series produce 450 ohms, what is the value of each resistor?

G5C06
What is the RMS voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC?

G5C07
What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance?

G5C08
What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?

G5C09
What is the capacitance of three 100 microfarad capacitors connected in series?

G5C10
What is the inductance of three 10 millihenry inductors connected in parallel?

G5C11
What is the inductance of a 20 millihenry inductor connected in series with a 50 millihenry inductor?

G5C12
What is the capacitance of a 20 microfarad capacitor connected in series with a 50 microfarad capacitor?

G5C13
Which of the following components should be added to a capacitor to increase the capacitance?

G5C14
Which of the following components should be added to an inductor to increase the inductance?

G5C15
What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor connected in parallel?

G5C16
Why is the conductor of the primary winding of many voltage step up transformers larger in diameter than the conductor of the secondary winding?

G5C17
What is the value in nanofarads (nF) of a 22,000 pF capacitor?

G5C18
What is the value in microfarads of a 4700 nanofarad (nF) capacitor?