Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
E0A10: What material found in some electronic components such as high-voltage capacitors and transformers is considered toxic?
Polychlorinated biphenyls
Polyethylene
Polytetrafluroethylene
Polymorphic silicon
E1A07: What is the only amateur band where transmission on specific channels rather than a range of frequencies is permitted?
12 meter band
17 meter band
30 meter band
60 meter band
E1B01: Which of the following constitutes a spurious emission?
An amateur station transmission made at random without the proper call sign identification
A signal transmitted to prevent its detection by any station other than the intended recipient
Any transmitted bogus signal that interferes with another licensed radio station
An emission outside its necessary bandwidth that can be reduced or eliminated without affecting the information transmitted
E1C02: What is meant by automatic control of a station?
The use of devices and procedures for control so that the control operator does not have to be present at a control point
A station operating with its output power controlled automatically
Remotely controlling a station's antenna pattern through a directional control link
The use of a control link between a control point and a locally controlled station
E1D08: Which VHF amateur service bands have frequencies available for space stations?
6 meters and 2 meters
6 meters, 2 meters, and 1.25 meters
2 meters and 1.25 meters
2 meters
E1E09: What may be the penalty for a VE who fraudulently administers or certifies an examination?
Revocation of the VE's amateur station license grant and the suspension of the VE's amateur operator license grant
A fine of up to $1000 per occurrence
A sentence of up to one year in prison
All of these choices are correct
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
E2A06: On what band would a satellite receive signals if it were operating in mode U/V?
435-438 MHz
144-146 MHz
50.0-50.2 MHz
29.5 to 29.7 MHz
E2B07: What is the name of the signal component that carries color information in NTSC video?
Luminance
Chroma
Hue
Spectral Intensity
E2C01: Which of the following is true about contest operating?
Operators are permitted to make contacts even if they do not submit a log
Interference to other amateurs is unavoidable and therefore acceptable
It is mandatory to transmit the call sign of the station being worked as part of every transmission to that station
Every contest requires a signal report in the exchange
E2D08: Which of the following types of packet frames is used to transmit APRS beacon data?
Unnumbered Information
Disconnect
Acknowledgement
Connect
E2E12: Which type of digital communication does not support keyboard-to-keyboard operation?
Winlink
RTTY
PSK31
MFSK
E3A08: When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
The E layer
The F1 layer
The F2 layer
The D layer
E3B09: At what time of day is gray-line propagation most likely to occur?
At sunrise and sunset
When the Sun is directly above the location of the transmitting station
When the Sun is directly overhead at the middle of the communications path between the two stations
When the Sun is directly above the location of the receiving station
E3C06: By how much does the VHF/UHF radio-path horizon distance exceed the geometric horizon?
By approximately 15% of the distance
By approximately twice the distance
By approximately one-half the distance
By approximately four times the distance
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
E4B05: If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?
146.52 Hz
10 Hz
146.52 kHz
1465.20 Hz
E4C05: What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?
The minimum detectable signal as a function of receive frequency
The theoretical noise at the input of a perfect receiver at room temperature
The noise figure of a 1 Hz bandwidth receiver
The galactic noise contribution to minimum detectable signal
E4D04: Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?
A band-pass filter in the feed line between the transmitter and receiver
A properly terminated circulator at the output of the transmitter
A Class C final amplifier
A Class D final amplifier
E4E14: What is one type of electrical interference that might be caused by the operation of a nearby personal computer?
A loud AC hum in the audio output of your station receiver
A clicking noise at intervals of a few seconds
The appearance of unstable modulated or unmodulated signals at specific frequencies
A whining type noise that continually pulses off and on
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%
E5C13: What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of an impedance?
Maidenhead grid
Faraday grid
Elliptical coordinates
Rectangular coordinates
E5D16: What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current?
1.73
0.5
0.866
0.577
E6A15: Which of the following semiconductor materials contains an excess of holes in the outer shell of electrons?
N-type
P-type
Superconductor-type
Bipolar-type
E6B01: What is the most useful characteristic of a Zener diode?
A constant current drop under conditions of varying voltage
A constant voltage drop under conditions of varying current
A negative resistance region
An internal capacitance that varies with the applied voltage
E6C06: Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
Larger bypass capacitors are used in CMOS circuit design
The input switching threshold is about two times the power supply voltage
The input switching threshold is about one-half the power supply voltage
Input signals are stronger
E6D08: What is one important reason for using powdered-iron toroids rather than ferrite toroids in an inductor?
Powdered-iron toroids generally have greater initial permeability
Powdered-iron toroids generally maintain their characteristics at higher currents
Powdered-iron toroids generally require fewer turns to produce a given inductance value
Powdered-iron toroids have higher power handling capacity
E6E07: Which of the following techniques is typically used to construct a MMIC-based microwave amplifier?
Ground-plane construction
Microstrip construction
Point-to-point construction
Wave-soldering construction
E6F08: Why are optoisolators often used in conjunction with solid state circuits when switching 120 VAC?
Optoisolators provide a low impedance link between a control circuit and a power circuit
Optoisolators provide impedance matching between the control circuit and power circuit
Optoisolators provide a very high degree of electrical isolation between a control circuit and the circuit being switched
Optoisolators eliminate the effects of reflected light in the control circuit
E7A02: How many output level changes are obtained for every two trigger pulses applied to the input of a T flip-flop circuit?
None
One
Two
Four
E7B20: What is a parametric amplifier?
A type of bipolar operational amplifier with excellent linearity derived from use of very high voltage on the collector
A low-noise VHF or UHF amplifier relying on varying reactance for amplification
A high power amplifier for HF application utilizing the Miller effect to increase gain
An audio push-pull amplifier using silicon carbide transistors for extremely low noise
E7C13: What is one advantage of a Pi matching network over an L matching network consisting of a single inductor and a single capacitor?
The Q of Pi networks can be varied depending on the component values chosen
L networks cannot perform impedance transformation
Pi networks have fewer components
Pi networks are designed for balanced input and output
E7D11: What is the purpose of R1 in the circuit shown in Figure E7-3?
It provides a constant load to the voltage source
It couples hum to D1
It supplies current to D1
It bypasses hum around D1
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
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
E7H04: How is positive feedback supplied in a Colpitts oscillator?
Through a tapped coil
Through link coupling
Through a capacitive divider
Through a neutralizing capacitor
E8A15: What would the waveform of a stream of digital data bits look like on a conventional oscilloscope?
A series of sine waves with evenly spaced gaps
A series of pulses with varying patterns
A running display of alpha-numeric characters
None of the above; this type of signal cannot be seen on a conventional oscilloscope
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
E8C04: What technique is used to minimize the bandwidth requirements of a PSK31 signal?
Zero-sum character encoding
Reed-Solomon character encoding
Use of sinusoidal data pulses
Use of trapezoidal data pulses
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
E9A14: How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?
6.17 dB
9.85 dB
12.5 dB
14.15 dB
E9B06: If the boom of a Yagi antenna is lengthened and the elements are properly retuned, what usually occurs?
The gain increases
The SWR decreases
The front-to-back ratio increases
The gain bandwidth decreases rapidly
E9C08: What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?
45 degrees
75 degrees
7.5 degrees
25 degrees
E9D15: Which of the following would provide the best RF ground for your station?
A 50-ohm resistor connected to ground
An electrically-short connection to a metal water pipe
An electrically-short connection to 3 or 4 interconnected ground rods driven into the Earth
An electrically-short connection to 3 or 4 interconnected ground rods via a series RF choke
E9E06: 3-element Yagi?
Pi network
Pi-L network
L network
Parallel-resonant tank
E9F11: What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?
The same as the characteristic impedance of the line
An inductive reactance
A capacitive reactance
The same as the input impedance of the final generator stage
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
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
