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
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
E1B03: Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?
1 mile
3 miles
10 miles
30 miles
E1C10: What types of amateur stations may automatically retransmit the radio signals of other amateur stations?
Only beacon, repeater or space stations
Only auxiliary, repeater or space stations
Only earth stations, repeater stations or model craft
Only auxiliary, beacon or space stations
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
E1E14: For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?
Preparing, processing, administering and coordinating an examination for an amateur radio license
Teaching an amateur operator license examination preparation course
No expenses are authorized for reimbursement
Providing amateur operator license examination preparation training materials
E1F13: What types of communications may be transmitted to amateur stations in foreign countries?
Business-related messages for non-profit organizations
Messages intended for connection to users of the maritime satellite service
Communications incidental to the purpose of the amateur service and remarks of a personal nature
All of these choices are correct
E2A08: Why should effective radiated power to a satellite which uses a linear transponder be limited?
To prevent creating errors in the satellite telemetry
To avoid reducing the downlink power to all other users
To prevent the satellite from emitting out of band signals
To avoid interfering with terrestrial QSOs
E2B04: What is blanking in a video signal?
Synchronization of the horizontal and vertical sync pulses
Turning off the scanning beam while it is traveling from right to left or from bottom to top
Turning off the scanning beam at the conclusion of a transmission
Transmitting a black and white test pattern
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
E2D01: Which of the following digital modes is especially designed for use for meteor scatter signals?
WSPR
FSK441
Hellschreiber
APRS
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
E3A05: Which of the following describes a method of establishing EME contacts?
Time synchronous transmissions with each station alternating
Storing and forwarding digital messages
Judging optimum transmission times by monitoring beacons from the Moon
High speed CW identification to avoid fading
E3B08: What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?
Transequatorial
Sporadic-E
Long-path
Gray-line
E3C05: Which of the following describes selective fading?
Variability of signal strength with beam heading
Partial cancellation of some frequencies within the received pass band
Sideband inversion within the ionosphere
Degradation of signal strength due to backscatter
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
E4B14: What happens if a dip meter is too tightly coupled to a tuned circuit being checked?
Harmonics are generated
A less accurate reading results
Cross modulation occurs
Intermodulation distortion occurs
E4C08: How might lowering the noise figure affect receiver performance?
It would reduce the signal to noise ratio
It would improve weak signal sensitivity
It would reduce bandwidth
It would increase bandwidth
E4D09: What is the purpose of the preselector in a communications receiver?
To store often-used frequencies
To provide a range of AGC time constants
To increase rejection of unwanted signals
To allow selection of the optimum RF amplifier device
E4E05: How can noise from an electric motor be suppressed?
By installing a high pass filter in series with the motor's power leads
By installing a brute-force AC-line filter in series with the motor leads
By installing a bypass capacitor in series with the motor leads
By using a ground-fault current interrupter in the circuit used to power the motor
E5A13: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 187?
38.1 kHz
76.2 kHz
1.332 kHz
2.665 kHz
E5B02: What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial voltage?
One discharge period
An exponential discharge rate of one
A discharge factor of one
One time constant
E5C04: In polar coordinates, what is the impedance of a network consisting of a 400-ohm-reactance capacitor in series with a 300-ohm resistor?
240 ohms at an angle of 36.9 degrees
240 ohms at an angle of -36.9 degrees
500 ohms at an angle of 53.1 degrees
500 ohms at an angle of -53.1 degrees
E5D03: What device is used to store electrical energy in an electrostatic field?
A battery
A transformer
A capacitor
An inductor
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
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
E6C04: Which of the following is the primary advantage of tri-state logic?
Low power consumption
Ability to connect many device outputs to a common bus
High speed operation
More efficient arithmetic operations
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
E6E04: What is the most common input and output impedance of circuits that use MMICs?
50 ohms
300 ohms
450 ohms
10 ohms
E6F01: What is photoconductivity?
The conversion of photon energy to electromotive energy
The increased conductivity of an illuminated semiconductor
The conversion of electromotive energy to photon energy
The decreased conductivity of an illuminated semiconductor
E7A09: D. It produces a logic "1" at its output if any single input is a logic "1"?
It produces a logic "0" at its output only if all inputs are logic "0"
It produces a logic "1" at its output only if all inputs are logic "1"
E7B11: In Figure E7-1, what is the purpose of R3?
Fixed bias
Emitter bypass
Output load resistor
Self bias
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
E7D16: When several electrolytic filter capacitors are connected in series to increase the operating voltage of a power supply filter circuit, why should resistors be connected across each capacitor?
To equalize, as much as possible, the voltage drop across each capacitor
To provide a safety bleeder to discharge the capacitors when the supply is off
To provide a minimum load current to reduce voltage excursions at light loads
All of these choices are correct
E7E13: Which of the following describes a common means of generating an SSB signal when using digital signal processing?
Mixing products are converted to voltages and subtracted by adder circuits
A frequency synthesizer removes the unwanted sidebands
Emulation of quartz crystal filter characteristics
The quadrature method
E7F01: What is the purpose of a prescaler circuit?
It converts the output of a JK flip flop to that of an RS flip-flop
It multiplies a higher frequency signal so a low-frequency counter can display the operating frequency
It prevents oscillation in a low-frequency counter circuit
It divides a higher frequency signal so a low-frequency counter can display the input frequency
E7G12: What is an integrated circuit operational amplifier?
A high-gain, direct-coupled differential amplifier with very high input and very low output impedance
A digital audio amplifier whose characteristics are determined by components external to the amplifier
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
An RF amplifier used in the UHF and microwave regions
E7H11: What are the major spectral impurity components of direct digital synthesizers?
Broadband noise
Digital conversion noise
Spurious signals at discrete frequencies
Nyquist limit noise
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
E8B04: What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2-kHz modulating frequency?
6000
3
2000
1/3
E8C03: What is one advantage of using the ASCII code for data communications?
It includes built-in error-correction features
It contains fewer information bits per character than any other code
It is possible to transmit both upper and lower case text
It uses one character as a shift code to send numeric and special characters
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
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
E9B13: What does the abbreviation NEC stand for when applied to antenna modeling programs?
Next Element Comparison
Numerical Electromagnetics Code
National Electrical Code
Numeric Electrical Computation
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
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
E9E09: Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?
Double-bazooka match
Hairpin match
Gamma match
All of these choices are correct
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
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
E9H08: What is the function of a sense antenna?
It modifies the pattern of a DF antenna array to provide a null in one direction
It increases the sensitivity of a DF antenna array
It allows DF antennas to receive signals at different vertical angles
It provides diversity reception that cancels multipath signals
