E0A07: How may dangerous levels of carbon monoxide from an emergency generator be detected?

By the odor

Any ordinary smoke detector can be used

By the yellowish appearance of the gas

E1A07: What is the only amateur band where transmission on specific channels rather than a range of frequencies is permitted?

12 meter band

17 meter band

30 meter band

E1B11: What is the permitted mean power of any spurious emission relative to the mean power of the fundamental emission from a station transmitter or external RF amplifier installed after January 1, 2003, and transmitting on a frequency below 30 MHZ?

At least 53 dB below

At least 63 dB below

At least 73 dB below

E1C02: What is meant by automatic control of a station?

A station operating with its output power controlled automatically

Remotely controlling a station's antenna pattern through a directional control link

The use of a control link between a control point and a locally controlled station

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

E1F07: When may an amateur station send a message to a business?

When the total money involved does not exceed $25

When the control operator is employed by the FCC or another government agency

When transmitting international third-party communications

E2A08: Why should effective radiated power to a satellite which uses a linear transponder be limited?

To prevent creating errors in the satellite telemetry

To prevent the satellite from emitting out of band signals

To avoid interfering with terrestrial QSOs

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

E2C02: Which of the following best describes the term "self-spotting" in regards to contest operating?

The acceptable practice of manually posting the call signs of stations on a call sign spotting network

A manual technique for rapidly zero beating or tuning to a station's frequency before calling that station

An automatic method for rapidly zero beating or tuning to a station's frequency before calling that station

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

AMTOR

170-Hz shift, 45 baud RTTY

PSK31

E2E02: What do the letters FEC mean as they relate to digital operation?

First Error Correction

Fatal Error Correction

Final Error Correction

E3A04: What type of receiving system is desirable for EME communications?

Equipment with very wide bandwidth

Equipment with very low dynamic range

Equipment with very low gain

E3B10: What is the cause of gray-line propagation?

At midday, the Sun being directly overhead superheats the ionosphere causing increased refraction of radio waves

In darkness, solar absorption drops greatly while atmospheric ionization remains steady

At mid afternoon, the Sun heats the ionosphere decreasing radio wave refraction and the MUF

E3C13: What type of polarization is best for ground-wave propagation?

Horizontal

Circular

Elliptical

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

E4C06: A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?

174 dBm

-164 dBm

-155 dBm

E4D14: Which of the following is a way to reduce the likelihood of receiver desensitization?

Raise the receiver IF frequency

Increase the receiver front end gain

Switch from fast AGC to slow AGC

E4E13: What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

Arcing contacts in a thermostatically controlled device

A defective doorbell or doorbell transformer inside a nearby residence

A malfunctioning illuminated advertising display

E5A03: What is the magnitude of the impedance of a series RLC circuit at resonance?

High, as compared to the circuit resistance

Approximately equal to capacitive reactance

Approximately equal to inductive reactance

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

E5C21: 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 3

Point 7

Point 8

E5D08: What type of energy is stored in an electromagnetic or electrostatic field?

Electromechanical energy

Thermodynamic energy

Kinetic energy

E6A13: What do the initials CMOS stand for?

Common Mode Oscillating System

Complementary Mica-Oxide Silicon

Common Mode Organic Silicon

E6B09: What is a common use for point contact diodes?

As a constant current source

As a constant voltage source

As a high voltage rectifier

E6C11: In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?

2

4

6

E6D01: What is cathode ray tube (CRT) persistence?

The time it takes for an image to appear after the electron beam is turned on

The relative brightness of the display under varying conditions of ambient light

The ability of the display to remain in focus under varying conditions

E6E04: What is the most common input and output impedance of circuits that use MMICs?

300 ohms

450 ohms

10 ohms

E6F09: What is the efficiency of a photovoltaic cell?

The output RF power divided by the input dc power

The effective payback period

The open-circuit voltage divided by the short-circuit current under full illumination

E7A04: How many flip-flops are required to divide a signal frequency by 4?

1

4

8

E7B14: In Figure E7-2, what is the purpose of C2?

Emitter bypass

Input coupling

Hum filtering

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

E7D17: What is the primary reason that a high-frequency inverter type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

The inverter design does not require any output filtering

It uses a diode bridge rectifier for increased output

It uses a large power-factor compensation capacitor to create "free power" from the unused portion of the AC cycle

E7E10: How does a diode detector function?

By breakdown of the Zener voltage

By mixing signals with noise in the transition region of the diode

By sensing the change of reactance in the diode with respect to frequency

E7F09: What is the purpose of a frequency counter?

To generate a series of reference signals at known frequency intervals

To display all frequency components of a transmitted signal

To provide a signal source at a very accurate frequency

E7G11: What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?

28

7

0.07

E7H14: What is a phase-locked loop circuit?

An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator

An electronic circuit also known as a monostable multivibrator

An electronic circuit consisting of a precision push-pull amplifier with a differential input

E8A08: What is the period of a wave?

The number of degrees in one cycle

The number of zero crossings in one cycle

The amplitude of the wave

E8B09: What is meant by deviation ratio?

The ratio of the audio modulating frequency to the center carrier frequency

The ratio of the carrier center frequency to the audio modulating frequency

The ratio of the highest audio modulating frequency to the average audio modulating frequency

E8C05: What is the necessary bandwidth of a 13-WPM international Morse code transmission?

Approximately 13 Hz

Approximately 26 Hz

Approximately 104 Hz

E8D12: What is the peak voltage of a sinusoidal waveform if an RMS-reading voltmeter reads 34 volts?

123 volts

96 volts

55 volts

E9A03: Which of the following antennas has no gain in any direction?

Quarter-wave vertical

Yagi

Half-wave dipole

E9B03: In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?

12 dB

18 dB

24 dB

E9C12: When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

Its overall length must not exceed 1/4 wavelength

It must be mounted more than 1 wavelength above ground

It should be configured as a four-sided loop

E9D11: What is the function of a loading coil as used with an HF mobile antenna?

To increase the SWR bandwidth

To lower the losses

To lower the Q

E9E06: 3-element Yagi?

Pi network

Pi-L network

Parallel-resonant tank

E9F13: What impedance does a 1/4-wavelength transmission line present to a generator when the line is shorted at the far end?

Very low impedance

The same as the characteristic impedance of the transmission line

The same as the generator output impedance

E9G06: On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

Prime axis

Impedance axis

Polar axis

E9H09: Which of the following describes the construction of a receiving loop antenna?

A large circularly-polarized antenna

A small coil of wire tightly wound around a toroidal ferrite core

A vertical antenna coupled to a feed line through an inductive loop of wire