Ham Extra License Practice Quiz

• Percentage: 0%; Correct: 0; Total: 0 of 50

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

By the odor
Only with a carbon monoxide detector
Any ordinary smoke detector can be used
By the yellowish appearance of the gas

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
3 kHz below the upper band edge

E1B05: What is the maximum bandwidth for a data emission on 60 meters?

60 Hz
170 Hz
1.5 kHz
2.8 kHz

E1C10: What types of amateur stations may automatically retransmit the radio signals of other amateur stations?

Only beacon, repeater or space stations
Only auxiliary, repeater or space stations
Only earth stations, repeater stations or model craft
Only auxiliary, beacon or space stations

E1D01: What is the definition of the term telemetry?

One-way transmission of measurements at a distance from the measuring instrument
Two-way radiotelephone transmissions in excess of 1000 feet
Two-way single channel transmissions of data
One-way transmission that initiates, modifies, or terminates the functions of a device at a distance

E1E04: Which of the following best describes the Volunteer Examiner accreditation process?

Each General, Advanced and Amateur Extra Class operator is automatically accredited as a VE when the license is granted
The amateur operator applying must pass a VE examination administered by the FCC Enforcement Bureau
The prospective VE obtains accreditation from the FCC
The procedure by which a VEC confirms that the VE applicant meets FCC requirements to serve as an examiner

E1F05: Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

440 - 450 MHz
53 - 54 MHz
222 - 223 MHz
420 - 430 MHz

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
The uplink and downlink frequency ranges

E2B08: Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?

Frequency-modulated sub-carrier
A separate VHF or UHF audio link
Frequency modulation of the video carrier
All of these choices are correct

E2C04: On which of the following frequencies is an amateur radio contest contact generally discouraged?

3.525 MHz
14.020 MHz
28.330 MHz
146.52 MHz

E2D10: How can an APRS station be used to help support a public service communications activity?

An APRS station with an emergency medical technician can automatically transmit medical data to the nearest hospital
APRS stations with General Personnel Scanners can automatically relay the participant numbers and time as they pass the check points
An APRS station with a GPS unit can automatically transmit information to show a mobile station's position during the event
All of these choices are correct

E2E03: How is Forward Error Correction implemented?

By the receiving station repeating each block of three data characters
By transmitting a special algorithm to the receiving station along with the data characters
By transmitting extra data that may be used to detect and correct transmission errors
By varying the frequency shift of the transmitted signal according to a predefined algorithm

E3A07: What frequency range would you normally tune to find EME signals in the 70 cm band?

430.000 - 430.150 MHz
430.100 - 431.100 MHz
431.100 - 431.200 MHz
432.000 - 432.100 MHz

E3B06: Which of the following amateur bands most frequently provides long-path propagation?

80 meters
20 meters
10 meters
6 meters

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
The interaction of charged particles from the Sun with the Earth's magnetic field and the ionosphere
Meteor showers concentrated in the northern latitudes

E4A10: Which of the following tests establishes that a silicon NPN junction transistor is biased on?

Measure base-to-emitter resistance with an ohmmeter; it should be approximately
Measure base-to-emitter resistance with an ohmmeter; it should be approximately 0.6 to 0.7 ohms
Measure base-to-emitter voltage with a voltmeter; it should be approximately
Measure base-to-emitter voltage with a voltmeter; it should be approximately

E4B03: If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

165.2 Hz
14.652 kHz
146.52 Hz
1.4652 MHz

E4C04: What is the definition of the noise figure of a receiver?

The ratio of atmospheric noise to phase noise
The noise bandwidth in Hertz compared to the theoretical bandwidth of a resistive network
The ratio of thermal noise to atmospheric noise
The ratio in dB of the noise generated by the receiver compared to the theoretical minimum noise

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?

146.34 MHz and 146.61 MHz
146.88 MHz and 146.34 MHz
146.10 MHz and 147.30 MHz
173.35 MHz and 139.40 MHz

E4E09: What undesirable effect can occur when using an IF noise blanker?

Received audio in the speech range might have an echo effect
The audio frequency bandwidth of the received signal might be compressed
Nearby signals may appear to be excessively wide even if they meet emission standards
FM signals can no longer be demodulated

E5A16: What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?

23.5 MHz
23.5 kHz
7.12 kHz
7.12 MHz

E5B10: What is the relationship between the current through an inductor and the voltage across an inductor?

Voltage leads current by 90 degrees
Current leads voltage by 90 degrees
Voltage and current are 180 degrees out of phase
Voltage and current are in phase

E5C05: In polar coordinates, what is the impedance of a network consisting of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor?

240 ohms at an angle of 36.9 degrees
240 ohms at an angle of -36.9 degrees
500 ohms at an angle of 53.1 degrees
500 ohms at an angle of -53.1 degrees

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

Electromechanical energy
Potential energy
Thermodynamic energy
Kinetic energy

E6A08: What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

Corner frequency
Alpha rejection frequency
Beta cutoff frequency
Alpha cutoff frequency

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

As a constant current source
As a constant voltage source
As an RF detector
As a high voltage rectifier

E6C04: Which of the following is the primary advantage of tri-state logic?

Low power consumption
Ability to connect many device outputs to a common bus
High speed operation
More efficient arithmetic operations

E6D15: What is the principle advantage of liquid-crystal display (LCD) devices over other types of display devices?

They consume less power
They can display changes instantly
They are visible in all light conditions
They can be easily interchanged with other display devices

E6E01: What is a crystal lattice filter?

A power supply filter made with interlaced quartz crystals
An audio filter made with four quartz crystals that resonate at 1-kHz intervals
A filter with wide bandwidth and shallow skirts made using quartz crystals
A filter with narrow bandwidth and steep skirts made using quartz crystals

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

A device which detects rotation of a control by interrupting a light source with a patterned wheel
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.

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

An XOR gate
A flip-flop
An OR gate
A multiplexer

E7B15: What is one way to prevent thermal runaway in a bipolar transistor amplifier?

Select transistors with high beta
Use a resistor in series with the emitter
All of these choices are correct

E7C07: What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

A band-pass filter
A notch filter
A Pi-network filter
An all-pass filter

E7D09: What is the purpose of C1 in the circuit shown in Figure E7-3?

It resonates at the ripple frequency
It provides fixed bias for Q1
It decouples the output
It filters the supply voltage

E7E09: What occurs when an excessive amount of signal energy reaches a mixer circuit?

Spurious mixer products are generated
Mixer blanking occurs
Automatic limiting occurs
A beat frequency is generated

E7F06: What is one purpose of a marker generator?

To add audio markers to an oscilloscope
To provide a frequency reference for a phase locked loop
To provide a means of calibrating a receiver's frequency settings
To add time signals to a transmitted signal

E7G12: What is an integrated circuit operational amplifier?

A high-gain, direct-coupled differential amplifier with very high input and very low output impedance
A digital audio amplifier whose characteristics are determined by components external to the amplifier
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
An RF amplifier used in the UHF and microwave regions

E7H17: Why is a phase-locked loop often used as part of a variable frequency synthesizer for receivers and transmitters?

It generates FM sidebands
It eliminates the need for a voltage controlled oscillator
It makes it possible for a VFO to have the same degree of frequency stability as a crystal oscillator
It can be used to generate or demodulate SSB signals by quadrature phase synchronization

E8A14: Which of these methods is commonly used to convert analog signals to digital signals?

Sequential sampling
Harmonic regeneration
Level shifting
Phase reversal

E8B02: How does the modulation index of a phase-modulated emission vary with RF carrier frequency (the modulated frequency)?

It increases as the RF carrier frequency increases
It decreases as the RF carrier frequency increases
It varies with the square root of the RF carrier frequency
It does not depend on the RF carrier frequency

E8C03: What is one advantage of using the ASCII code for data communications?

It includes built-in error-correction features
It contains fewer information bits per character than any other code
It is possible to transmit both upper and lower case text
It uses one character as a shift code to send numeric and special characters

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

123 volts
96 volts
55 volts
48 volts

E9A06: What is included in the total resistance of an antenna system?

Radiation resistance plus space impedance
Radiation resistance plus transmission resistance
Transmission-line resistance plus radiation resistance
Radiation resistance plus ohmic resistance

E9B13: What does the abbreviation NEC stand for when applied to antenna modeling programs?

Next Element Comparison
Numerical Electromagnetics Code
National Electrical Code
Numeric Electrical Computation

E9C02: What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

A cardioid
A figure-8 end-fire along the axis of the array
A figure-8 broadside to the axis of the array

E9D07: What is a disadvantage of using a multiband trapped antenna?

It might radiate harmonics
It radiates the harmonics and fundamental equally well
It is too sharply directional at lower frequencies
It must be neutralized

E9E09: Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?

Double-bazooka match
Hairpin match
Gamma match
All of these choices are correct

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
3.5 meters
0.2 meters

E9G07: On the Smith chart shown in Figure E9-3, what is the only straight line shown?

The reactance axis
The current axis
The voltage axis
The resistance axis

E9H12: What is an advantage of using a shielded loop antenna for direction finding?

It automatically cancels ignition noise pickup in mobile installations
It is electro-statically balanced against ground, giving better nulls
It eliminates tracking errors caused by strong out-of-band signals
It allows stations to communicate without giving away their position