Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
E0A07: How may dangerous levels of carbon monoxide from an emergency generator be detected?
By the odor
Only with a carbon monoxide detector
Any ordinary smoke detector can be used
By the yellowish appearance of the gas
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
E1B08: What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receiver(s) involved are of good engineering design?
The amateur station must cease operation
The amateur station must cease operation on all frequencies below 30 MHz
The amateur station must cease operation on all frequencies above 30 MHz
The amateur station must avoid transmitting during certain hours on frequencies that cause the interference
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
E1D09: Which amateur service UHF bands have frequencies available for a space station?
70 cm
70 cm, 23 cm, 13 cm
70 cm and 33 cm
33 cm and 13 cm
E1E03: What is a Volunteer Examiner Coordinator?
A person who has volunteered to administer amateur operator license examinations
A person who has volunteered to prepare amateur operator license examinations
An organization that has entered into an agreement with the FCC to coordinate amateur operator license examinations
The person who has entered into an agreement with the FCC to be the VE session manager
E1F05: Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?
440 - 450 MHz
53 - 54 MHz
222 - 223 MHz
420 - 430 MHz
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
E2B08: Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?
Frequency-modulated sub-carrier
A separate VHF or UHF audio link
Frequency modulation of the video carrier
All of these choices are correct
E2C11: How should you generally identify your station when attempting to contact a DX station working a pileup or in a contest?
Send your full call sign once or twice
Send only the last two letters of your call sign until you make contact
Send your full call sign and grid square
Send the call sign of the DX station three times, the words this is, then your call sign three times
E2D10: How can an APRS station be used to help support a public service communications activity?
An APRS station with an emergency medical technician can automatically transmit medical data to the nearest hospital
APRS stations with General Personnel Scanners can automatically relay the participant numbers and time as they pass the check points
An APRS station with a GPS unit can automatically transmit information to show a mobile station's position during the event
All of these choices are correct
E2E10: Which of these digital communications modes has the narrowest bandwidth?
MFSK16
170-Hz shift, 45 baud RTTY
PSK31
300-baud packet
E3A04: What type of receiving system is desirable for EME communications?
Equipment with very wide bandwidth
Equipment with very low dynamic range
Equipment with very low gain
Equipment with very low noise figures
E3B02: What is the approximate maximum range for signals using transequatorial propagation?
1000 miles
2500 miles
5000 miles
7500 miles
E3C12: How does the maximum distance of ground-wave propagation change when the signal frequency is increased?
It stays the same
It increases
It decreases
It peaks at roughly 14 MHz
E4A01: How does a spectrum analyzer differ from an oscilloscope?
A spectrum analyzer measures ionospheric reflection; an oscilloscope displays electrical signals
A spectrum analyzer displays the peak amplitude of signals; an oscilloscope displays the average amplitude of signals
A spectrum analyzer displays signals in the frequency domain; an oscilloscope displays signals in the time domain
A spectrum analyzer displays radio frequencies; an oscilloscope displays audio frequencies
E4B09: What is indicated if the current reading on an RF ammeter placed in series with the antenna feed line of a transmitter increases as the transmitter is tuned to resonance?
There is possibly a short to ground in the feed line
The transmitter is not properly neutralized
There is an impedance mismatch between the antenna and feed line
There is more power going into the antenna
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
E4D06: What is the term for unwanted signals generated by the mixing of two or more signals?
Amplifier desensitization
Neutralization
Adjacent channel interference
Intermodulation interference
E4E11: Which of the following is the most likely cause if you are hearing combinations of local AM broadcast signals within one or more of the MF or HF ham bands?
The broadcast station is transmitting an over-modulated signal
Nearby corroded metal joints are mixing and re-radiating the broadcast signals
You are receiving sky wave signals from a distant station
Your station receiver IF amplifier stage is defective
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
E5C18: In polar coordinates, what is the impedance of a series circuit consisting of a resistance of 4 ohms, an inductive reactance of 4 ohms, and a capacitive reactance of 1 ohm?
6.4 ohms at an angle of 53 degrees
5 ohms at an angle of 37 degrees
5 ohms at an angle of 45 degrees
10 ohms at an angle of -51 degrees
E5D08: What type of energy is stored in an electromagnetic or electrostatic field?
Electromechanical energy
Potential energy
Thermodynamic energy
Kinetic energy
E6A10: In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?
2
4
5
6
E6B12: What is one common use for PIN diodes?
As a constant current source
As a constant voltage source
As an RF switch
As a high voltage rectifier
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
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
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
E6F06: Which of these materials is affected the most by photoconductivity?
A crystalline semiconductor
An ordinary metal
A heavy metal
A liquid semiconductor
E7A13: What is an SR or RS flip-flop?
A speed-reduced logic device with high power capability
A set/reset flip-flop whose output is low when R is high and S is low, high when S is high and R is low, and unchanged when both inputs are low
A speed-reduced logic device with very low voltage operation capability
A set/reset flip-flop that toggles whenever the T input is pulsed, unless both inputs are high
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
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
E7D14: What is one purpose of a "bleeder" resistor in a conventional (unregulated) power supply?
To cut down on waste heat generated by the power supply
To balance the low-voltage filament windings
To improve output voltage regulation
To boost the amount of output current
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
E7F06: What is one purpose of a marker generator?
To add audio markers to an oscilloscope
To provide a frequency reference for a phase locked loop
To provide a means of calibrating a receiver's frequency settings
To add time signals to a transmitted signal
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
E7H07: What is a magnetron oscillator?
An oscillator in which the output is fed back to the input by the magnetic field of a transformer
A crystal oscillator in which variable frequency is obtained by placing the crystal in a strong magnetic field
A UHF or microwave oscillator consisting of a diode vacuum tube with a specially shaped anode, surrounded by an external magnet
A reference standard oscillator in which the oscillations are synchronized by magnetic coupling to a rubidium gas tube
E8A09: What type of waveform is produced by human speech?
Sinusoidal
Logarithmic
Irregular
Trapezoidal
E8B08: What parameter does the modulating signal vary in a pulse-position modulation system?
The number of pulses per second
The amplitude of the pulses
The duration of the pulses
The time at which each pulse occurs
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
E8D16: What is the RMS value of a 340-volt peak-to-peak pure sine wave?
120V AC
170V AC
240V AC
300V AC
E9A07: What is a folded dipole antenna?
A dipole one-quarter wavelength long
A type of ground-plane antenna
A dipole constructed from one wavelength of wire forming a very thin loop
A dipole configured to provide forward gain
E9B09: What type of computer program technique is commonly used for modeling antennas?
Graphical analysis
Method of Moments
Mutual impedance analysis
Calculus differentiation with respect to physical properties
E9C02: What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?
A cardioid
A figure-8 end-fire along the axis of the array
A figure-8 broadside to the axis of the array
Omnidirectional
E9D05: Where should a high-Q loading coil be placed to minimize losses in a shortened vertical antenna?
Near the center of the vertical radiator
As low as possible on the vertical radiator
As close to the transmitter as possible
At a voltage node
E9E03: What is the name of the matching system that uses a section of transmission line connected in parallel with the feed line at the feed point?
The gamma match
The delta match
The omega match
The stub match
E9F04: What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?
2.70
0.66
0.30
0.10
E9G08: What is the process of normalization with regard to a Smith chart?
Reassigning resistance values with regard to the reactance axis
Reassigning reactance values with regard to the resistance axis
Reassigning impedance values with regard to the prime center
Reassigning prime center with regard to the reactance axis
E9H11: What characteristic of a cardioid-pattern antenna is useful for direction finding?
A very sharp peak
A very sharp single null
Broad band response
High-radiation angle
