E0A06: Why are there separate electric (E) and magnetic (H) field MPE limits?

The body reacts to electromagnetic radiation from both the E and H fields

Ground reflections and scattering make the field impedance vary with location

E field and H field radiation intensity peaks can occur at different locations

E1A01: When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the highest frequency at which a properly adjusted USB emission will be totally within the band?

The exact upper band edge

300 Hz below the upper band edge

1 kHz below the upper band edge

E1B04: What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historical Places?

A proposal must be submitted to the National Park Service

A letter of intent must be filed with the National Audubon Society

A form FSD-15 must be submitted to the Department of the Interior

E1C03: How do the control operator responsibilities of a station under automatic control differ from one under local control?

Under local control there is no control operator

Under automatic control there is no control operator

Under local control a control operator is not required to be present at a control point

E1D04: What is an Earth station in the amateur satellite service?

An amateur station that is not able to communicate using amateur satellites

An amateur station that transmits telemetry consisting of measurement of upper atmosphere data from space

Any amateur station on the surface of the Earth

E1E02: Where are the questions for all written US amateur license examinations listed?

In FCC Part 97

In a question pool maintained by the FCC

In the appropriate FCC Report and Order

E1F03: Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

The equipment dealer assembled it from a kit

It was imported from a manufacturer in a country that does not require certification of RF power amplifiers

It was imported from a manufacturer in another country, and it was certificated by that country's government

E2A05: What do the letters in a satellite's mode designator specify?

Power limits for uplink and downlink transmissions

The location of the ground control station

The polarization of uplink and downlink signals

E2B11: What is the function of the Vertical Interval Signaling (VIS) code transmitted as part of an SSTV transmission?

To lock the color burst oscillator in color SSTV images

To provide vertical synchronization

To identify the call sign of the station transmitting

E2C01: Which of the following is true about contest operating?

Interference to other amateurs is unavoidable and therefore acceptable

It is mandatory to transmit the call sign of the station being worked as part of every transmission to that station

Every contest requires a signal report in the exchange

E2D09: Under clear communications conditions, which of these digital communications modes has the fastest data throughput?

AMTOR

170-Hz shift, 45 baud RTTY

PSK31

E2E07: What is the typical bandwidth of a properly modulated MFSK16 signal?

31 Hz

550 Hz

2.16 kHz

E3A02: What characterizes libration fading of an Earth-Moon-Earth signal?

A slow change in the pitch of the CW signal

A gradual loss of signal as the Sun rises

The returning echo is several Hertz lower in frequency than the transmitted signal

E3B08: What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?

Transequatorial

Sporadic-E

Long-path

E3C01: Which of the following effects does Aurora activity have on radio communications?

SSB signals are raspy

Signals propagating through the Aurora are fluttery

CW signals appear to be modulated by white noise

E4A06: Which of the following could be determined with a spectrum analyzer?

The degree of isolation between the input and output ports of a 2 meter duplexer

Whether a crystal is operating on its fundamental or overtone frequency

The spectral output of a transmitter

E4B08: Which of the following is a characteristic of a good DC voltmeter?

High reluctance input

Low reluctance input

Low impedance input

E4C13: How does a narrow-band roofing filter affect receiver performance?

It improves sensitivity by reducing front end noise

It improves intelligibility by using low Q circuitry to reduce ringing

All of these choices are correct

E4D05: What transmitter frequencies would cause an intermodulation-product signal in a receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?

146.88 MHz and 146.34 MHz

146.10 MHz and 147.30 MHz

173.35 MHz and 139.40 MHz

E4E06: What is a major cause of atmospheric static?

Solar radio frequency emissions

Geomagnetic storms

Meteor showers

E5A06: What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

It is at a minimum

It equals 1 divided by the quantity 2 times Pi, multiplied by the square root of inductance L multiplied by capacitance C

It equals 2 multiplied by Pi, multiplied by frequency "F", multiplied by inductance "L"

E5B11: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

14 degrees with the voltage lagging the current

76 degrees with the voltage lagging the current

76 degrees with the voltage leading the current

E5C06: In polar coordinates, what is the impedance of a network consisting of a 100-ohm-reactance capacitor in series with a 100-ohm resistor?

121 ohms at an angle of -25 degrees

191 ohms at an angle of -85 degrees

161 ohms at an angle of -65 degrees

E5D12: How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-V AC at 4 amperes?

400 watts

2000 watts

50 watts

E6A15: Which of the following semiconductor materials contains an excess of holes in the outer shell of electrons?

N-type

Superconductor-type

Bipolar-type

E6B10: In Figure E6-3, what is the schematic symbol for a light-emitting diode?

1

6

7

E6C01: What is the recommended power supply voltage for TTL series integrated circuits?

12 volts

1.5 volts

13.6 volts

E6D05: What is a liquid-crystal display (LCD)?

A modern replacement for a quartz crystal oscillator which displays its fundamental frequency

A frequency-determining unit for a transmitter or receiver

A display that uses a glowing liquid to remain brightly lit in dim light

E6E10: What is the equivalent circuit of a quartz crystal?

Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in parallel

Motional capacitance, motional inductance, loss resistance, and a capacitor represent electrode and stray capacitance all in series

Motional inductance and loss resistance in series, paralleled with motional capacitance and a capacitor representing electrode and stray capacitance

E6F12: What absorbs the energy from light falling on a photovoltaic cell?

Protons

Photons

Holes

E7A03: Which of the following can divide the frequency of a pulse train by 2?

An XOR gate

An OR gate

A multiplexer

E7B05: What can be done to prevent unwanted oscillations in an RF power amplifier?

Tune the stage for maximum SWR

Tune both the input and output for maximum power

Use a phase inverter in the output filter

E7C06: What are the distinguishing features of an elliptical filter?

Gradual passband rolloff with minimal stop band ripple

Extremely flat response over its pass band with gradually rounded stop band corners

Gradual passband rolloff with extreme stop band ripple

E7D08: What type of circuit is shown in Figure E7-3?

Switching voltage regulator

Grounded emitter amplifier

Emitter follower

E7E07: What is meant by the term baseband in radio communications?

The lowest frequency band that the transmitter or receiver covers

The unmodulated bandwidth of the transmitted signal

The basic oscillator frequency in an FM transmitter that is multiplied to increase the deviation and carrier frequency

E7F08: Which of the following is performed by a frequency counter?

Determining the frequency deviation with an FM discriminator

Mixing the incoming signal with a WWV reference

Converting the phase of the measured signal to a voltage which is proportional to the frequency

E7G10: What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?

1

0.03

76

E7H02: What condition must exist for a circuit to oscillate?

It must have at least two stages

It must be neutralized

It must have negative feedback sufficient to cancel the input signal

E8A02: What type of wave has a rise time significantly faster than its fall time (or vice versa)?

A cosine wave

A square wave

A sine wave

E8B10: Which of these methods can be used to combine several separate analog information streams into a single analog radio frequency signal?

Frequency shift keying

A diversity combiner

Pulse compression

E8C08: What term describes a wide-bandwidth communications system in which the transmitted carrier frequency varies according to some predetermined sequence?

Amplitude compandored single sideband

AMTOR

Time-domain frequency modulation

E8D01: Which of the following is the easiest voltage amplitude parameter to measure when viewing a pure sine wave signal on an analog oscilloscope?

RMS voltage

Average voltage

DC voltage

E9A13: How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?

6.0 dB

8.15 dB

2.79 dB

E9B11: What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength?

Ground conductivity will not be accurately modeled

The resulting design will favor radiation of harmonic energy

The antenna will become mechanically unstable

E9C04: Which of the following describes a basic unterminated rhombic antenna?

Unidirectional; four-sides, each side one quarter-wavelength long; terminated in a resistance equal to its characteristic impedance

Four-sides; an LC network at each corner except for the transmission connection;

Four-sides, each of a different physical length

E9D06: Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

To swamp out harmonics

To maximize losses

To minimize the Q

E9E02: What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?

The delta match

The epsilon match

The stub match

E9F05: What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz?

20 meters

2.3 meters

0.2 meters

E9G04: What are the two families of circles and arcs that make up a Smith chart?

Resistance and voltage

Reactance and voltage

Voltage and impedance

E9H08: What is the function of a sense antenna?

It increases the sensitivity of a DF antenna array

It allows DF antennas to receive signals at different vertical angles

It provides diversity reception that cancels multipath signals