E0A09: Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?

Mica

Zinc oxide

Uranium Hexaflouride

E1A08: If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

The control operator of the packet bulletin board station

The control operators of all the stations in the system

The control operators of all the stations in the system not authenticating the source from which they accept communications

E1B07: Where must the carrier frequency of a CW signal be set to comply with FCC rules for 60 meter operation?

At the lowest frequency of the channel

At the highest frequency of the channel

On any frequency where the signal's sidebands are within the channel

E1C09: Which of these frequencies are available for an automatically controlled repeater operating below 30 MHz?

18.110 - 18.168 MHz

24.940 - 24.990 MHz

10.100 - 10.150 MHz

E1D10: Which amateur stations are eligible to be telecommand stations?

Any amateur station designated by NASA

Any amateur station so designated by the ITU

All of these choices are correct

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

E1F01: On what frequencies are spread spectrum transmissions permitted?

Only on amateur frequencies above 50 MHz

Only on amateur frequencies above 420 MHz

Only on amateur frequencies above 144 MHz

E2A01: What is the direction of an ascending pass for an amateur satellite?

From west to east

From east to west

From north to south

E2B15: What signals SSTV receiving equipment to begin a new picture line?

Elapsed time

Specific tone amplitudes

A two-tone signal

E2C06: During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?

At the top of each band, usually in a segment reserved for contests

In the middle of each band, usually on the national calling frequency

In the middle of the band, usually 25 kHz above the national calling frequency

E2D01: Which of the following digital modes is especially designed for use for meteor scatter signals?

WSPR

Hellschreiber

APRS

E2E11: What is the difference between direct FSK and audio FSK?

Audio FSK has a superior frequency response

Direct FSK uses a DC-coupled data connection

Audio FSK can be performed anywhere in the transmit chain

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

E3C02: What is the cause of Aurora activity?

The interaction between the solar wind and the Van Allen belt

A low sunspot level combined with tropospheric ducting

Meteor showers concentrated in the northern latitudes

E4A01: How does a spectrum analyzer differ from an oscilloscope?

A spectrum analyzer measures ionospheric reflection; an oscilloscope displays electrical signals

A spectrum analyzer displays the peak amplitude of signals; an oscilloscope displays the average amplitude of signals

A spectrum analyzer displays radio frequencies; an oscilloscope displays audio frequencies

E4B05: If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

146.52 Hz

10 Hz

146.52 kHz

E4C08: How might lowering the noise figure affect receiver performance?

It would reduce the signal to noise ratio

It would reduce bandwidth

It would increase bandwidth

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

E4E14: What is one type of electrical interference that might be caused by the operation of a nearby personal computer?

A loud AC hum in the audio output of your station receiver

A clicking noise at intervals of a few seconds

A whining type noise that continually pulses off and on

E5A11: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?

157.8 Hz

315.6 Hz

23.67 kHz

E5B07: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?

68.2 degrees with the voltage leading the current

14.0 degrees with the voltage leading the current

68.2 degrees with the voltage lagging 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

E5D03: What device is used to store electrical energy in an electrostatic field?

A battery

A transformer

An inductor

E6A17: What are the names of the three terminals of a field-effect transistor?

Gate 1, gate 2, drain

Emitter, base, collector

Emitter, base 1, base 2

E6B12: What is one common use for PIN diodes?

As a constant current source

As a constant voltage source

As a high voltage rectifier

E6C07: In Figure E6-5, what is the schematic symbol for an AND gate?

2

3

4

E6D10: What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

Toroidal cores make it easier to couple the magnetic energy into other components

Toroidal cores exhibit greater hysteresis

Toroidal cores have lower Q characteristics

E6E12: What is a "Jones filter" as used as part of a HF receiver IF stage?

An automatic notch filter

A special filter that emphasizes image responses

A filter that removes impulse noise

E6F05: Which of the following describes an optical shaft encoder?

A device which measures the strength a beam of light using analog to digital conversion

A digital encryption device often used to encrypt spacecraft control signals

A device for generating RTTY signals by means of a rotating light source.

E7A05: Which of the following is a circuit that continuously alternates between two states without an external clock?

Monostable multivibrator

J-K flip-flop

T flip-flop

E7B07: Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?

Reduced intermodulation products

Increased overall intelligibility

Signal inversion

E7C01: How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground

Two capacitors are in series between the input and output and an inductor is connected between the two capacitors and ground

An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output

E7D06: What is the purpose of Q1 in the circuit shown in Figure E7-3?

It provides negative feedback to improve regulation

It provides a constant load for the voltage source

It provides D1 with current

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

E7F01: What is the purpose of a prescaler circuit?

It converts the output of a JK flip flop to that of an RS flip-flop

It multiplies a higher frequency signal so a low-frequency counter can display the operating frequency

It prevents oscillation in a low-frequency counter circuit

E7G02: What is the effect of ringing in a filter?

An echo caused by a long time delay

A reduction in high frequency response

Partial cancellation of the signal over a range of frequencies

E7H10: What information is contained in the lookup table of a direct digital frequency synthesizer?

The phase relationship between a reference oscillator and the output waveform

The phase relationship between a voltage-controlled oscillator and the output waveform

The synthesizer frequency limits and frequency values stored in the radio memories

E8A15: What would the waveform of a stream of digital data bits look like on a conventional oscilloscope?

A series of sine waves with evenly spaced gaps

A running display of alpha-numeric characters

None of the above; this type of signal cannot be seen on a conventional oscilloscope

E8B08: What parameter does the modulating signal vary in a pulse-position modulation system?

The number of pulses per second

The amplitude of the pulses

The duration of the pulses

E8C12: What is the advantage of including a parity bit with an ASCII character stream?

Faster transmission rate

The signal can overpower interfering signals

Foreign language characters can be sent

E8D14: Which of the following is a typical value for the peak-to-peak voltage at a standard U.S. household electrical outlet?

240 volts

120 volts

170 volts

E9A08: What is meant by antenna gain?

The ratio of the signal in the forward direction to that in the opposite direction

The ratio of the amount of power radiated by an antenna compared to the transmitter output power

The final amplifier gain minus the transmission-line losses, including any phasing lines present

E9B07: How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from an isotropic antenna, assuming each is driven by the same amount of power?

The total amount of radiation from the directional antenna is increased by the gain of the antenna

The total amount of radiation from the directional antenna is stronger by its front to back ratio

The radiation from the isotropic antenna is 2.15 dB stronger than that from the directional antenna

E9C07: What type of antenna pattern over real ground is shown in Figure E9-2?

Azimuth

Radiation resistance

Polarization

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

E9E06: 3-element Yagi?

Pi network

Pi-L network

Parallel-resonant tank

E9F11: What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?

The same as the characteristic impedance of the line

An inductive reactance

The same as the input impedance of the final generator stage

E9G08: What is the process of normalization with regard to a Smith chart?

Reassigning resistance values with regard to the reactance axis

Reassigning reactance values with regard to the resistance axis

Reassigning prime center with regard to the reactance axis

E9H03: What is the effective isotropic radiated power of a repeater station with 200 watts transmitter power output, 2-dB feed line loss, 2.8-dB duplexer loss, 1.2-dB circulator loss and 7-dBi antenna gain?

159 watts

632 watts

63.2 watts