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
E1A06: Which of the following describes the rules for operation on the 60 meter band?
Working DX is not permitted
Operation is restricted to specific emission types and specific channels
Operation is restricted to LSB
All of these choices are correct
E1B04: What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historical Places?
A proposal must be submitted to the National Park Service
A letter of intent must be filed with the National Audubon Society
An Environmental Assessment must be submitted to the FCC
A form FSD-15 must be submitted to the Department of the Interior
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
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
E1E01: What is the minimum number of qualified VEs required to administer an Element 4 amateur operator license examination?
5
2
4
3
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
E2A12: What is one way to predict the location of a satellite at a given time?
By means of the Doppler data for the specified satellite
By subtracting the mean anomaly from the orbital inclination
By adding the mean anomaly to the orbital inclination
By calculations using the Keplerian elements for the specified satellite
E2B09: What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?
A special IF converter
A special front end limiter
A special notch filter to remove synchronization pulses
No other hardware is needed
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
E2D06: Which of the following is a commonly used 2-meter APRS frequency?
144.39 MHz
144.20 MHz
145.02 MHz
146.52 MHz
E2E06: What is the most common data rate used for HF packet communications?
48 baud
110 baud
300 baud
1200 baud
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
E3B11: Which of the following describes gray-line propagation?
Backscatter contacts on the 10 meter band
Over the horizon propagation on the 6 and 2 meter bands
Long distance communications at twilight on frequencies less than 15 MHz
Tropospheric propagation on the 2 meter and 70 centimeter bands
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
E4A08: Which of the following instruments would be best for measuring the SWR of a beam antenna?
A spectrum analyzer
A Q meter
An ohmmeter
An antenna analyzer
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
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
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
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
E5A06: What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?
It is at a minimum
It is at a maximum
It equals 1 divided by the quantity 2 times Pi, multiplied by the square root of inductance L multiplied by capacitance C
It equals 2 multiplied by Pi, multiplied by frequency "F", multiplied by inductance "L"
E5B06: How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
4.50 seconds
9 seconds
450 seconds
900 seconds
E5C22: In rectangular coordinates, what is the impedance of a network consisting of a 10-microhenry inductor in series with a 40-ohm resistor at 500 MHz?
40 + j31,400
40 - j31,400
31,400 + j40
31,400 - j40
E5D14: What is reactive power?
Wattless, nonproductive power
Power consumed in wire resistance in an inductor
Power lost because of capacitor leakage
Power consumed in circuit Q
E6A07: In Figure E6-1, what is the schematic symbol for a PNP transistor?
1
2
4
5
E6B08: Which of the following describes a type of semiconductor diode?
Metal-semiconductor junction
Electrolytic rectifier
CMOS-field effect
Thermionic emission diode
E6C05: Which of the following is an advantage of CMOS logic devices over TTL devices?
Differential output capability
Lower distortion
Immune to damage from static discharge
Lower power consumption
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
E6E11: Which of the following materials is likely to provide the highest frequency of operation when used in MMICs?
Silicon
Silicon nitride
Silicon dioxide
Gallium nitride
E6F07: What is a solid state relay?
A relay using transistors to drive the relay coil
A device that uses semiconductor devices to implement the functions of an electromechanical relay
A mechanical relay that latches in the on or off state each time it is pulsed
A passive delay line
E7A03: Which of the following can divide the frequency of a pulse train by 2?
An XOR gate
A flip-flop
An OR gate
A multiplexer
E7B02: What is a Class D amplifier?
A type of amplifier that uses switching technology to achieve high efficiency
A low power amplifier using a differential amplifier for improved linearity
An amplifier using drift-mode FETs for high efficiency
A frequency doubling amplifier
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
E7E04: What is one way a single-sideband phone signal can be generated?
By using a balanced modulator followed by a filter
By using a reactance modulator followed by a mixer
By using a loop modulator followed by a mixer
By driving a product detector with a DSB signal
E7F10: What alternate method of determining frequency, other than by directly counting input pulses, is used by some counters?
GPS averaging
Period measurement plus mathematical computation
Prescaling
D/A conversion
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
E7H02: What condition must exist for a circuit to oscillate?
It must have at least two stages
It must be neutralized
It must have positive feedback with a gain greater than 1
It must have negative feedback sufficient to cancel the input signal
E8A05: What would be the most accurate way of measuring the RMS voltage of a complex waveform?
By using a grid dip meter
By measuring the voltage with a D'Arsonval meter
By using an absorption wavemeter
By measuring the heating effect in a known resistor
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
E8C01: Which one of the following digital codes consists of elements having unequal length?
ASCII
AX.25
Baudot
Morse code
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
E9A06: What is included in the total resistance of an antenna system?
Radiation resistance plus space impedance
Radiation resistance plus transmission resistance
Transmission-line resistance plus radiation resistance
Radiation resistance plus ohmic resistance
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
E9C01: What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?
A cardioid
Omnidirectional
A figure-8 broadside to the axis of the array
A figure-8 oriented along the axis of the array
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
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
E9F01: What is the velocity factor of a transmission line?
The ratio of the characteristic impedance of the line to the terminating impedance
The index of shielding for coaxial cable
The velocity of the wave in the transmission line multiplied by the velocity of light in a vacuum
The velocity of the wave in the transmission line divided by the velocity of light in a vacuum
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
E9H09: Which of the following describes the construction of a receiving loop antenna?
A large circularly-polarized antenna
A small coil of wire tightly wound around a toroidal ferrite core
One or more turns of wire wound in the shape of a large open coil
A vertical antenna coupled to a feed line through an inductive loop of wire
