Ham Extra License Practice Quiz
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E0A11: Which of the following injuries can result from using high-power UHF or microwave transmitters?
Hearing loss caused by high voltage corona discharge
Blood clotting from the intense magnetic field
Localized heating of the body from RF exposure in excess of the MPE limits
Ingestion of ozone gas from the cooling system
E1A12: With your transceiver displaying the carrier frequency of CW signals, you hear a DX station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same frequency?
Yes, the DX station initiated the contact
Yes, the displayed frequency is within the 80 meter CW band segment
No, sidebands from the CW signal will be out of the band.
No, USA stations are not permitted to use CW emissions below 3.525 MHz
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 center 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
29.500 - 29.700 MHz
E1D04: What is an Earth station in the amateur satellite service?
An amateur station within 50 km of the Earth's surface intended for communications with amateur stations by means of objects in space
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 a question pool maintained by all the VECs
In the appropriate FCC Report and Order
E1F11: Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification?
It must produce full legal output when driven by not more than 5 watts of mean RF input power
It must be capable of external RF switching between its input and output networks
It must exhibit a gain of 0 dB or less over its full output range
It must satisfy the FCC's spurious emission standards when operated at the lesser of 1500 watts, or its full output power
E2A10: Why may the received signal from an amateur satellite exhibit a rapidly repeating fading effect?
Because the satellite is spinning
Because of ionospheric absorption
Because of the satellite's low orbital altitude
Because of the Doppler Effect
E2B12: How are analog SSTV images typically transmitted on the HF bands?
Video is converted to equivalent Baudot representation
Video is converted to equivalent ASCII representation
Varying tone frequencies representing the video are transmitted using PSK
Varying tone frequencies representing the video are transmitted using single sideband
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 weak signal segment of the band, with most of the activity near the calling frequency
In the middle of the band, usually 25 kHz above the national calling frequency
E2D08: Which of the following types of packet frames is used to transmit APRS beacon data?
Unnumbered Information
Disconnect
Acknowledgement
Connect
E2E04: What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?
Selective fading has occurred
One of the signal filters has saturated
The receiver has drifted 5 kHz from the desired receive frequency
The mark and space signal have been inverted
E3A03: When scheduling EME contacts, which of these conditions will generally result in the least path loss?
When the Moon is at perigee
When the Moon is full
When the Moon is at apogee
When the MUF is above 30 MHz
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
At twilight, D-layer absorption drops while E-layer and F-layer propagation remain strong
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
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
E4A07: Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?
Antenna analyzers automatically tune your antenna for resonance
Antenna analyzers do not need an external RF source
Antenna analyzers display a time-varying representation of the modulation envelope
All of these choices are correct
E4B15: Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?
The inductance to capacitance ratio
The frequency shift
The bandwidth of the circuit's frequency response
The resonant frequency of the circuit
E4C11: Which of the following is a desirable amount of selectivity for an amateur SSB phone receiver?
1 kHz
2.4 kHz
4.2 kHz
4.8 kHz
E4D09: What is the purpose of the preselector in a communications receiver?
To store often-used frequencies
To provide a range of AGC time constants
To increase rejection of unwanted signals
To allow selection of the optimum RF amplifier device
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
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
14 degrees with the voltage leading the current
76 degrees with the voltage lagging the current
76 degrees with the voltage leading the current
E5C17: In rectangular coordinates, what is the impedance of a circuit that has an admittance of 5 millisiemens at -30 degrees?
173 - j100 ohms
200 + j100 ohms
173 + j100 ohms
200 - j100 ohms
E5D05: Which of the following creates a magnetic field?
Potential differences between two points in space
Electric current
A charged capacitor
A battery
E6A09: What is a depletion-mode FET?
An FET that exhibits a current flow between source and drain when no gate voltage is applied
An FET that has no current flow between source and drain when no gate voltage is applied
Any FET without a channel
Any FET for which holes are the majority carriers
E6B06: Which of the following is a common use of a hot-carrier diode?
As balanced mixers in FM generation
As a variable capacitance in an automatic frequency control circuit
As a constant voltage reference in a power supply
As a VHF / UHF mixer or detector
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
E6E12: What is a "Jones filter" as used as part of a HF receiver IF stage?
An automatic notch filter
A variable bandwidth crystal lattice filter
A special filter that emphasizes image responses
A filter that removes impulse noise
E6F10: What is the most common type of photovoltaic cell used for electrical power generation?
Selenium
Silicon
Cadmium Sulfide
Copper oxide
E7A04: How many flip-flops are required to divide a signal frequency by 4?
1
2
4
8
E7B17: Why are third-order intermodulation distortion products of particular concern in linear power amplifiers?
Because they are relatively close in frequency to the desired signal
Because they are relatively far in frequency from the desired signal
Because they invert the sidebands causing distortion
Because they maintain the sidebands, thus causing multiple duplicate signals
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
A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between input and output
E7D02: What is one characteristic of a switching electronic voltage regulator?
The resistance of a control element is varied in direct proportion to the line voltage or load current
It is generally less efficient than a linear regulator
The control device's duty cycle is controlled to produce a constant average output voltage
It gives a ramp voltage at its output
E7E05: What circuit is added to an FM transmitter to boost the higher audio frequencies?
A de-emphasis network
A heterodyne suppressor
An audio prescaler
A pre-emphasis network
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
It divides a higher frequency signal so a low-frequency counter can display the input frequency
E7G14: What is the typical input impedance of an integrated circuit op-amp?
100 ohms
1000 ohms
Very low
Very high
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
E8B06: What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?
2.14
0.214
0.47
47
E8C06: What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
0.1 Hz
0.3 kHz
0.5 kHz
1.0 kHz
E8D07: What is an electromagnetic wave?
Alternating currents in the core of an electromagnet
A wave consisting of two electric fields at right angles to each other
A wave consisting of an electric field and a magnetic field oscillating at right angles to each other
A wave consisting of two magnetic fields at right angles to each other
E9A01: Which of the following describes an isotropic antenna?
A grounded antenna used to measure earth conductivity
A horizontally polarized antenna used to compare Yagi antennas
A theoretical antenna used as a reference for antenna gain
A spacecraft antenna used to direct signals toward the earth
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 computed feed point impedance may be incorrect
The antenna will become mechanically unstable
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
E9D01: How does the gain of an ideal parabolic dish antenna change when the operating frequency is doubled?
Gain does not change
Gain is multiplied by 0.707
Gain increases by 6 dB
Gain increases by 3 dB
E9E05: How must the driven element in a 3-element Yagi be tuned to use a hairpin matching system?
The driven element reactance must be capacitive
The driven element reactance must be inductive
The driven element resonance must be lower than the operating frequency
The driven element radiation resistance must be higher than the characteristic impedance of the transmission line
E9F06: What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically one-half wavelength long at 14.10 MHz?
15 meters
20 meters
10 meters
71 meters
E9G10: What do the arcs on a Smith chart represent?
Frequency
SWR
Points with constant resistance
Points with constant reactance
E9H01: What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2-dB feed line loss, 2.2-dB duplexer loss and 7-dBd antenna gain?
1977 watts
78.7 watts
420 watts
286 watts
