Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
E0A03: Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?
Use a calibrated antenna analyzer
Use a hand calculator plus Smith-chart equations to calculate the fields
Use an antenna modeling program to calculate field strength at accessible locations
All of the choices are correct
E1A04: With your transceiver displaying the carrier frequency of phone signals, you hear a DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower sideband on the same frequency?
Yes, because the DX station initiated the contact
Yes, because the displayed frequency is within the 75 meter phone band segment
No, my sidebands will extend beyond the edge of the phone band segment
No, USA stations are not permitted to use phone emissions below 3.610 MHz
E1B03: Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?
1 mile
3 miles
10 miles
30 miles
E1C04: When may an automatically controlled station retransmit third party communications?
Never
Only when transmitting RTTY or data emissions
When specifically agreed upon by the sending and receiving stations
When approved by the National Telecommunication and Information Administration
E1D07: Which amateur service HF bands have frequencies authorized to space stations?
Only 40m, 20m, 17m, 15m, 12m and 10m
Only 40m, 20m, 17m, 15m and 10m bands
40m, 30m, 20m, 15m, 12m and 10m bands
All HF bands
E1E05: What is the minimum passing score on amateur operator license examinations?
Minimum passing score of 70%
Minimum passing score of 74%
Minimum passing score of 80%
Minimum passing score of 77%
E1F09: Which of the following conditions apply when transmitting spread spectrum emission?
A station transmitting SS emission must not cause harmful interference to other stations employing other authorized emissions
The transmitting station must be in an area regulated by the FCC or in a country that permits SS emissions
The transmission must not be used to obscure the meaning of any communication
All of these choices are correct
E2A01: What is the direction of an ascending pass for an amateur satellite?
From west to east
From east to west
From south to north
From north to south
E2B15: What signals SSTV receiving equipment to begin a new picture line?
Specific tone frequencies
Elapsed time
Specific tone amplitudes
A two-tone signal
E2C03: From which of the following bands is amateur radio contesting generally excluded?
30 meters
6 meters
2 meters
33 cm
E2D03: Which of the following digital modes is especially useful for EME communications?
FSK441
PACTOR III
Olivia
JT65
E2E09: Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?
RTTY
PACTOR
MT63
PSK31
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
E3B02: What is the approximate maximum range for signals using transequatorial propagation?
1000 miles
2500 miles
5000 miles
7500 miles
E3C07: How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?
The main lobe takeoff angle increases with increasing height
The main lobe takeoff angle decreases with increasing height
The horizontal beam width increases with height
The horizontal beam width decreases with height
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
E4B04: If a frequency counter with a specified accuracy of +/- 0.1 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?
14.652 Hz
0.1 MHz
1.4652 Hz
1.4652 kHz
E4C03: What is the term for the blocking of one FM phone signal by another, stronger FM phone signal?
Desensitization
Cross-modulation interference
Capture effect
Frequency discrimination
E4D12: What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?
Desensitization
Quieting
Cross-modulation interference
Squelch gain rollback
E4E06: What is a major cause of atmospheric static?
Solar radio frequency emissions
Thunderstorms
Geomagnetic storms
Meteor showers
E5A09: What is the phase relationship between the current through and the voltage across a parallel resonant circuit at resonance?
The voltage leads the current by 90 degrees
The current leads the voltage by 90 degrees
The voltage and current are in phase
The voltage and current are 180 degrees out of phase
E5B13: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 250 ohms, R is 1 kilohm, and XL is 500 ohms?
81.47 degrees with the voltage lagging the current
81.47 degrees with the voltage leading the current
14.04 degrees with the voltage lagging the current
14.04 degrees with the voltage leading the current
E5C20: Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?
Point 1
Point 3
Point 7
Point 8
E5D06: In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?
In the same direction as the current
In a direction opposite to the current
In all directions; omnidirectional
In a direction determined by the left-hand rule
E6A10: In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?
2
4
5
6
E6B05: What characteristic of a PIN diode makes it useful as an RF switch or attenuator?
Extremely high reverse breakdown voltage
Ability to dissipate large amounts of power
Reverse bias controls its forward voltage drop
A large region of intrinsic material
E6C11: In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?
2
4
5
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
The length of time the image remains on the screen after the beam is turned off
E6E04: What is the most common input and output impedance of circuits that use MMICs?
50 ohms
300 ohms
450 ohms
10 ohms
E6F02: What happens to the conductivity of a photoconductive material when light shines on it?
It increases
It decreases
It stays the same
It becomes unstable
E7A14: What is a JK flip-flop?
A flip-flop similar to an RS except that it toggles when both J and K are high
A flip-flop utilizing low power, low temperature Joule-Kelvin devices
A flip-flop similar to a D flip-flop except that it triggers on the negative clock edge
A flip-flop originally developed in Japan and Korea which has very low power consumption
E7B01: For what portion of a signal cycle does a Class AB amplifier operate?
More than 180 degrees but less than 360 degrees
Exactly 180 degrees
The entire cycle
Less than 180 degrees
E7C04: How does an impedance-matching circuit transform a complex impedance to a resistive impedance?
It introduces negative resistance to cancel the resistive part of impedance
It introduces transconductance to cancel the reactive part of impedance
It cancels the reactive part of the impedance and changes the resistive part to a desired value
Network resistances are substituted for load resistances and reactances are matched to the resistances
E7D13: What is the purpose of D1 in the circuit shown in Figure E7-3?
To provide line voltage stabilization
To provide a voltage reference
Peak clipping
Hum filtering
E7E06: Why is de-emphasis commonly used in FM communications receivers?
For compatibility with transmitters using phase modulation
To reduce impulse noise reception
For higher efficiency
To remove third-order distortion products
E7F11: What is an advantage of a period-measuring frequency counter over a direct-count type?
It can run on battery power for remote measurements
It does not require an expensive high-precision time base
It provides improved resolution of low-frequency signals within a comparable time period
It can directly measure the modulation index of an FM transmitter
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
Undesired oscillations added to the desired signal
E7H18: What are the major spectral impurity components of phase-locked loop synthesizers?
Phase noise
Digital conversion noise
Spurious signals at discrete frequencies
Nyquist limit noise
E8A03: What type of wave is made up of sine waves of a given fundamental frequency plus all its harmonics?
A sawtooth wave
A square wave
A sine wave
A cosine wave
E8B07: When using a pulse-width modulation system, why is the transmitter's peak power greater than its average power?
The signal duty cycle is less than 100%
The signal reaches peak amplitude only when voice modulated
The signal reaches peak amplitude only when voltage spikes are generated within the modulator
The signal reaches peak amplitude only when the pulses are also amplitude modulated
E8C02: What are some of the differences between the Baudot digital code and ASCII?
Baudot uses four data bits per character, ASCII uses seven or eight; Baudot uses one character as a shift code, ASCII has no shift code
Baudot uses five data bits per character, ASCII uses seven or eight; Baudot uses two characters as shift codes, ASCII has no shift code
Baudot uses six data bits per character, ASCII uses seven or eight; Baudot has no shift code, ASCII uses two characters as shift codes
Baudot uses seven data bits per character, ASCII uses eight; Baudot has no shift code, ASCII uses two characters as shift codes
E8D11: What is the average power dissipated by a 50-ohm resistive load during one complete RF cycle having a peak voltage of 35 volts?
12.2 watts
9.9 watts
24.5 watts
16 watts
E9A03: Which of the following antennas has no gain in any direction?
Quarter-wave vertical
Yagi
Half-wave dipole
Isotropic antenna
E9B10: What is the principle of a Method of Moments analysis?
A wire is modeled as a series of segments, each having a uniform value of current
A wire is modeled as a single sine-wave current generator
A wire is modeled as a series of points, each having a distinct location in space
A wire is modeled as a series of segments, each having a distinct value of voltage across it
E9C04: Which of the following describes a basic unterminated rhombic antenna?
Unidirectional; four-sides, each side one quarter-wavelength long; terminated in a resistance equal to its characteristic impedance
Bidirectional; four-sides, each side one or more wavelengths long; open at the end opposite the transmission line connection
Four-sides; an LC network at each corner except for the transmission connection;
Four-sides, each of a different physical length
E9D08: What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?
It is increased
It is decreased
No change occurs
It becomes flat
E9E08: Which of the following measurements is characteristic of a mismatched transmission line?
An SWR less than 1:1
A reflection coefficient greater than 1
A dielectric constant greater than 1
An SWR greater than 1:1
E9F09: What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?
10 meters
6.9 meters
24 meters
50 meters
E9G09: What third family of circles is often added to a Smith chart during the process of solving problems?
Standing-wave ratio circles
Antenna-length circles
Coaxial-length circles
Radiation-pattern circles
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
