Ham Extra License Practice Quiz
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E0A05: What is one of the potential hazards of using microwaves in the amateur radio bands?
Microwaves are ionizing radiation
The high gain antennas commonly used can result in high exposure levels
Microwaves often travel long distances by ionospheric reflection
The extremely high frequency energy can damage the joints of antenna structures
E1A09: What is the first action you should take if your digital message forwarding station inadvertently forwards a communication that violates FCC rules?
Discontinue forwarding the communication as soon as you become aware of it
Notify the originating station that the communication does not comply with FCC rules
Notify the nearest FCC Field Engineer's office
Discontinue forwarding all messages
E1B10: What frequencies are authorized to an amateur station participating in RACES?
All amateur service frequencies authorized to the control operator
Specific segments in the amateur service MF, HF, VHF and UHF bands
Specific local government channels
Military Affiliate Radio System (MARS) channels
E1C08: What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?
30 seconds
3 minutes
5 minutes
10 minutes
E1D03: What is a telecommand station in the amateur satellite service?
An amateur station located on the Earth's surface for communications with other Earth stations by means of Earth satellites
An amateur station that transmits communications to initiate, modify or terminate functions of a space station
An amateur station located more than 50 km above the Earth's surface
An amateur station that transmits telemetry consisting of measurements of upper atmosphere data from space
E1E10: What must the administering VEs do after the administration of a successful examination for an amateur operator license?
They must collect and send the documents to the NCVEC for grading
They must collect and submit the documents to the coordinating VEC for grading
They must submit the application document to the coordinating VEC according to the coordinating VEC instructions
They must collect and send the documents to the FCC according to instructions
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
When neither the amateur nor his or her employer has a pecuniary interest in the communications
E2A09: What do the terms L band and S band specify with regard to satellite communications?
The 23 centimeter and 13 centimeter bands
The 2 meter and 70 centimeter bands
FM and Digital Store-and-Forward systems
Which sideband to use
E2B16: Which of the following is the video standard used by North American Fast Scan ATV stations?
PAL
DRM
Scottie
NTSC
E2C08: Why are received spread-spectrum signals resistant to interference?
Signals not using the spectrum-spreading algorithm are suppressed in the receiver
The high power used by a spread-spectrum transmitter keeps its signal from being easily overpowered
The receiver is always equipped with a digital blanker circuit
If interference is detected by the receiver it will signal the transmitter to change frequencies
E2D11: Which of the following data are used by the APRS network to communicate your location?
Polar coordinates
Time and frequency
Radio direction finding LOPs
Latitude and longitude
E2E05: How does ARQ accomplish error correction?
Special binary codes provide automatic correction
Special polynomial codes provide automatic correction
If errors are detected, redundant data is substituted
If errors are detected, a retransmission is requested
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
E3B03: What is the best time of day for transequatorial propagation?
Morning
Noon
Afternoon or early evening
Late at night
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
E4A02: Which of the following parameters would a spectrum analyzer display on the horizontal axis?
SWR
Q
Time
Frequency
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
E4C07: What does the MDS of a receiver represent?
The meter display sensitivity
The minimum discernible signal
The multiplex distortion stability
The maximum detectable spectrum
E4D01: What is meant by the blocking dynamic range of a receiver?
The difference in dB between the noise floor and thelevel of an incoming signal which will cause 1 dB of gain compression
The minimum difference in dB between the levels of two FM signals which will cause one signal to block the other
The difference in dB between the noise floor and the third order intercept point
The minimum difference in dB between two signals which produce third order intermodulation products greater than the noise floor
E4E04: How can conducted and radiated noise caused by an automobile alternator be suppressed?
By installing filter capacitors in series with the DC power lead and by installing a blocking capacitor in the field lead
By installing a noise suppression resistor and a blocking capacitor in both leads
By installing a high-pass filter in series with the radio's power lead and a low-pass filter in parallel with the field lead
By connecting the radio's power leads directly to the battery and by installing coaxial capacitors in line with the alternator leads
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
E5B03: The capacitor in an RC circuit is discharged to what percentage of the starting voltage after two time constants?
86.5%
63.2%
36.8%
13.5%
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
E5D10: How can the true power be determined in an AC circuit where the voltage and current are out of phase?
By multiplying the apparent power times the power factor
By dividing the reactive power by the power factor
By dividing the apparent power by the power factor
By multiplying the reactive power times the power factor
E6A12: Why do many MOSFET devices have internally connected Zener diodes on the gates?
To provide a voltage reference for the correct amount of reverse-bias gate voltage
To protect the substrate from excessive voltages
To keep the gate voltage within specifications and prevent the device from overheating
To reduce the chance of the gate insulation being punctured by static discharges or excessive voltages
E6B13: What type of bias is required for an LED to emit light?
Reverse bias
Forward bias
Zero bias
Inductive bias
E6C13: Which of the following is an advantage of BiCMOS logic?
Its simplicity results in much less expensive devices than standard CMOS
It is totally immune to electrostatic damage
It has the high input impedance of CMOS and the low output impedance of bipolar transistors
All of these choices are correct
E6D11: How many turns will be required to produce a 1-mH inductor using a ferrite toroidal core that has an inductance index (A L) value of 523 millihenrys/1000 turns?
2 turns
4 turns
43 turns
229 turns
E6E10: What is the equivalent circuit of a quartz crystal?
Motional capacitance, motional inductance and loss resistance in series, with a shunt capacitance representing electrode and stray capacitance
Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in parallel
Motional capacitance, motional inductance, loss resistance, and a capacitor represent electrode and stray capacitance all in series
Motional inductance and loss resistance in series, paralleled with motional capacitance and a capacitor representing electrode and stray capacitance
E6F10: What is the most common type of photovoltaic cell used for electrical power generation?
Selenium
Silicon
Cadmium Sulfide
Copper oxide
E7A07: What logical operation does a NAND gate perform?
It produces a logic "0" at its output only when all inputs are logic "0"
It produces a logic "1" at its output only when all inputs are logic "1"
It produces a logic "0" at its output if some but not all of its inputs are logic "1"
It produces a logic "0" at its output only when all inputs are logic "1"
E7B18: Which of the following is a characteristic of a grounded-grid amplifier?
High power gain
High filament voltage
Low input impedance
Low bandwidth
E7C08: What kind of digital signal processing audio filter might be used to remove unwanted noise from a received SSB signal?
An adaptive filter
A crystal-lattice filter
A Hilbert-transform filter
A phase-inverting filter
E7D04: Which of the following types of linear voltage regulator usually make the most efficient use of the primary power source?
A series current source
A series regulator
A shunt regulator
A shunt current source
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
E7F03: What is the function of a decade counter digital IC?
It produces one output pulse for every ten input pulses
It decodes a decimal number for display on a seven-segment LED display
It produces ten output pulses for every input pulse
It adds two decimal numbers together
E7G14: What is the typical input impedance of an integrated circuit op-amp?
100 ohms
1000 ohms
Very low
Very high
E7H09: What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter and a low-pass anti-alias filter?
A direct digital synthesizer
A hybrid synthesizer
A phase locked loop synthesizer
A diode-switching matrix synthesizer
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
E8B03: What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency, when the modulating frequency is 1000 Hz?
3
0.3
3000
1000
E8C05: What is the necessary bandwidth of a 13-WPM international Morse code transmission?
Approximately 13 Hz
Approximately 26 Hz
Approximately 52 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
48 volts
E9A11: Which of the following choices is a way to improve the efficiency of a ground-mounted quarter-wave vertical antenna?
Install a good radial system
Isolate the coax shield from ground
Shorten the radiating element
Reduce the diameter of the radiating element
E9B08: How can the approximate beamwidth in a given plane of a directional antenna be determined?
Note the two points where the signal strength of the antenna is 3 dB less than maximum and compute the angular difference
Measure the ratio of the signal strengths of the radiated power lobes from the front and rear of the antenna
Draw two imaginary lines through the ends of the elements and measure the angle between the lines
Measure the ratio of the signal strengths of the radiated power lobes from the front and side of the antenna
E9C11: How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus rocky ground?
The low-angle radiation decreases
The high-angle radiation increases
Both the high- and low-angle radiation decrease
The low-angle radiation increases
E9D09: What is an advantage of using top loading in a shortened HF vertical antenna?
Lower Q
Greater structural strength
Higher losses
Improved radiation efficiency
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
E9F15: What impedance does a 1/2-wavelength transmission line present to a generator when the line is open at the far end?
Very high impedance
Very low impedance
The same as the characteristic impedance of the line
The same as the output impedance of the generator
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
E9H10: How can the output voltage of a multi-turn receiving loop antenna be increased?
By reducing the permeability of the loop shield
By increasing the number of wire turns in the loop and reducing the area of the loop structure
By winding adjacent turns in opposing directions
By increasing either the number of wire turns in the loop or the area of the loop structure or both
