Ham Extra License Practice Quiz


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

E0A01: What, if any, are the differences between the radiation produced by radioactive materials and the electromagnetic energy radiated by an antenna?

There is no significant difference between the two types of radiation
Only radiation produced by radioactivity can injure human beings
Radioactive materials emit ionizing radiation, while RF signals have less energy and can only cause heating
Radiation from an antenna will damage unexposed photographic film but ordinary radioactive materials do not cause this problem

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 operator of the originating 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

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

60 Hz
170 Hz
1.5 kHz
2.8 kHz

E1C07: What is meant by local control?

Controlling a station through a local auxiliary link
Automatically manipulating local station controls
Direct manipulation of the transmitter by a control operator
Controlling a repeater using a portable handheld transceiver

E1D11: Which amateur stations are eligible to operate as Earth stations?

Any amateur station whose licensee has filed a pre-space notification with the FCC's International Bureau
Only those of General, Advanced or Amateur Extra Class operators
Only those of Amateur Extra Class operators
Any amateur station, subject to the privileges of the class of operator license held by the control operator

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 a question pool maintained by all the VECs
In the appropriate FCC Report and Order

E1F12: Who may be the control operator of an auxiliary station?

Any licensed amateur operator
Only Technician, General, Advanced or Amateur Extra Class operators
Only General, Advanced or Amateur Extra Class operators
Only Amateur Extra Class operators

E2A11: What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

A linearly polarized antenna
A circularly polarized antenna
An isotropic antenna
A log-periodic dipole array

E2B17: What is the approximate bandwidth of a slow-scan TV signal?

600 Hz
3 kHz
2 MHz
6 MHz

E2C10: Why might a DX station state that they are listening on another frequency?

Because the DX station may be transmitting on a frequency that is prohibited to some responding stations
To separate the calling stations from the DX station
To reduce interference, thereby improving operating efficiency
All of these choices are correct

E2D08: Which of the following types of packet frames is used to transmit APRS beacon data?

Unnumbered Information
Disconnect
Acknowledgement
Connect

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

E3A10: Which of the following is a good technique for making meteor-scatter contacts?

15 second timed transmission sequences with stations alternating based on location
Use of high speed CW or digital modes
Short transmission with rapidly repeated call signs and signal reports
All of these choices are correct

E3B07: Which of the following could account for hearing an echo on the received signal of a distant station?

High D layer absorption
Meteor scatter
Transmit frequency is higher than the MUF
Receipt of a signal by more than one path

E3C12: How does the maximum distance of ground-wave propagation change when the signal frequency is increased?

It stays the same
It increases
It decreases
It peaks at roughly 14 MHz

E4A05: Which of the following test instruments is used to display intermodulation distortion products in an SSB transmission?

A wattmeter
A spectrum analyzer
A logic analyzer
A time-domain reflectometer

E4B13: How is the compensation of an oscilloscope probe typically adjusted?

A square wave is displayed and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
A high frequency sine wave is displayed and the probe is adjusted for maximum amplitude
A frequency standard is displayed and the probe is adjusted until the deflection time is accurate
A DC voltage standard is displayed and the probe is adjusted until the displayed voltage is accurate

E4C15: What is the primary source of noise that can be heard from an HF receiver with an antenna connected?

Detector noise
Induction motor noise
Receiver front-end noise
Atmospheric noise

E4D06: What is the term for unwanted signals generated by the mixing of two or more signals?

Amplifier desensitization
Neutralization
Adjacent channel interference
Intermodulation interference

E4E01: Which of the following types of receiver noise can often be reduced by use of a receiver noise blanker?

Ignition noise
Broadband white noise
Heterodyne interference
All of these choices are correct

E5A14: What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50 microhenrys and C is 40 picofarads?

44.72 MHz
22.36 MHz
3.56 MHz
1.78 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

E5C23: Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300-ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?

Point 1
Point 3
Point 5
Point 8

E5D04: What unit measures electrical energy stored in an electrostatic field?

Coulomb
Joule
Watt
Volt

E6A03: What are the majority charge carriers in P-type semiconductor material?

Free neutrons
Free protons
Holes
Free electrons

E6B08: Which of the following describes a type of semiconductor diode?

Metal-semiconductor junction
Electrolytic rectifier
CMOS-field effect
Thermionic emission diode

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

2
4
5
6

E6D02: Exceeding what design rating can cause a cathode ray tube (CRT) to generate X-rays?

The heater voltage
The anode voltage
The operating temperature
The operating frequency

E6E08: How is power-supply voltage normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?

Through a resistor and/or RF choke connected to the amplifier output lead
MMICs require no operating bias
Through a capacitor and RF choke connected to the amplifier input lead
Directly to the bias-voltage (VCC IN) lead

E6F03: What is the most common configuration of an optoisolator or optocoupler?

A lens and a photomultiplier
A frequency modulated helium-neon laser
An amplitude modulated helium-neon laser
An LED and a phototransistor

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

1
2
4
8

E7B16: What is the effect of intermodulation products in a linear power amplifier?

Transmission of spurious signals
Creation of parasitic oscillations
Low efficiency
All of these choices are correct

E7C03: What advantage does a Pi-L-network have over a Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?

Greater harmonic suppression
Higher efficiency
Lower losses
Greater transformation range

E7D10: What is the purpose of C3 in the circuit shown in Figure E7-3?

It prevents self-oscillation
It provides brute force filtering of the output
It provides fixed bias for Q1
It clips the peaks of the ripple

E7E01: Which of the following can be used to generate FM phone emissions?

A balanced modulator on the audio amplifier
A reactance modulator on the oscillator
A reactance modulator on the final amplifier
A balanced modulator on the oscillator

E7F07: What determines the accuracy of a frequency counter?

The accuracy of the time base
The speed of the logic devices used
Accuracy of the AC input frequency to the power supply
Proper balancing of the mixer diodes

E7G09: What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts dc is applied to the input?

0.23 volts
2.3 volts
-0.23 volts
-2.3 volts

E7H08: What is a Gunn diode oscillator?

An oscillator based on the negative resistance properties of properly-doped semiconductors
An oscillator based on the argon gas diode
A highly stable reference oscillator based on the tee-notch principle
A highly stable reference oscillator based on the hot-carrier effect

E8A06: What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?

2.5 to 1
25 to 1
1 to 1
100 to 1

E8B11: Which of the following describes frequency division multiplexing?

The transmitted signal jumps from band to band at a predetermined rate
Two or more information streams are merged into a "baseband", which then modulates the transmitter
The transmitted signal is divided into packets of information
Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter

E8C10: What spread-spectrum communications technique alters the center frequency of a conventional carrier many times per second in accordance with a pseudo-random list of channels?

Frequency hopping
Direct sequence
Time-domain frequency modulation
Frequency compandored spread-spectrum

E8D13: Which of the following is a typical value for the peak voltage at a standard U.S. household electrical outlet?

240 volts
170 volts
120 volts
340 volts

E9A05: Which of the following factors may affect the feed point impedance of an antenna?

Transmission-line length
Antenna height, conductor length/diameter ratio and location of nearby conductive objects
Constant feed point impedance
Sunspot activity and time of day

E9B09: What type of computer program technique is commonly used for modeling antennas?

Graphical analysis
Method of Moments
Mutual impedance analysis
Calculus differentiation with respect to physical properties

E9C03: What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?

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

E9D14: Which of the following types of conductor would be best for minimizing losses in a station's RF ground system?

A resistive wire, such as a spark plug wire
A wide flat copper strap
A cable with 6 or 7 18-gauge conductors in parallel
A single 12 or 10-gauge stainless steel wire

E9E11: What is an effective way of matching a feed line to a VHF or UHF antenna when the impedances of both the antenna and feed line are unknown?

Use a 50-ohm 1:1 balun between the antenna and feed line
Use the "universal stub" matching technique
Connect a series-resonant LC network across the antenna feed terminals
Connect a parallel-resonant LC network across the antenna feed terminals

E9F16: Which of the following is a significant difference between foam-dielectric coaxial cable and solid-dielectric cable, assuming all other parameters are the same?

Reduced safe operating voltage limits
Reduced losses per unit of length
Higher velocity factor
All of these choices are correct

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

Resistance and voltage
Reactance and voltage
Resistance and reactance
Voltage and impedance

E9H04: What term describes station output, including the transmitter, antenna and everything in between, when considering transmitter power and system gains and losses?

Power factor
Half-power bandwidth
Effective radiated power
Apparent power