Ham Extra License Practice Quiz
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E0A02: When evaluating RF exposure levels from your station at a neighbor's home, what must you do?
Make sure signals from your station are less than the controlled MPE limits
Make sure signals from your station are less than the uncontrolled MPE limits
You need only evaluate exposure levels on your own property
Advise your neighbors of the results of your tests
E1A01: When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the highest frequency at which a properly adjusted USB emission will be totally within the band?
The exact upper band edge
300 Hz below the upper band edge
1 kHz below the upper band edge
3 kHz below the upper band edge
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
E1D02: What is the amateur satellite service?
A radio navigation service using satellites for the purpose of self training, intercommunication and technical studies carried out by amateurs
A spacecraft launching service for amateur-built satellites
A radio communications service using amateur radio stations on satellites
A radio communications service using stations on Earth satellites for public service broadcast
E1E07: What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?
Warn the candidate that continued failure to comply will result in termination of the examination
Immediately terminate the candidate's examination
Allow the candidate to complete the examination, but invalidate the results
Immediately terminate everyones examination and close the session
E1F14: Under what circumstances might the FCC issue a "Special Temporary Authority" (STA) to an amateur station?
To provide for experimental amateur communications
To allow regular operation on Land Mobile channels
To provide additional spectrum for personal use
To provide temporary operation while awaiting normal licensing
E2A04: What is meant by the term mode as applied to an amateur radio satellite?
The type of signals that can be relayed through the satellite
The satellite's uplink and downlink frequency bands
The satellite's orientation with respect to the Earth
Whether the satellite is in a polar or equatorial orbit
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
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
E2D12: How does JT65 improve EME communications?
It can decode signals many dB below the noise floor using FEC
It controls the receiver to track Doppler shift
It supplies signals to guide the antenna to track the Moon
All of these choices are correct
E2E11: What is the difference between direct FSK and audio FSK?
Direct FSK applies the data signal to the transmitter VFO
Audio FSK has a superior frequency response
Direct FSK uses a DC-coupled data connection
Audio FSK can be performed anywhere in the transmit chain
E3A03: When scheduling EME contacts, which of these conditions will generally result in the least path loss?
When the Moon is at perigee
When the Moon is full
When the Moon is at apogee
When the MUF is above 30 MHz
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
E3C01: Which of the following effects does Aurora activity have on radio communications?
SSB signals are raspy
Signals propagating through the Aurora are fluttery
CW signals appear to be modulated by white noise
All of these choices are correct
E4A04: Which of the following test instruments is used to display spurious signals from a radio transmitter?
A spectrum analyzer
A wattmeter
A logic analyzer
A time-domain reflectometer
E4B02: What is an advantage of using a bridge circuit to measure impedance?
It provides an excellent match under all conditions
It is relatively immune to drift in the signal generator source
The measurement is based on obtaining a signal null, which can be done very precisely
It can display results directly in Smith chart format
E4C13: How does a narrow-band roofing filter affect receiver performance?
It improves sensitivity by reducing front end noise
It improves intelligibility by using low Q circuitry to reduce ringing
It improves dynamic range by attenuating strong signals near the receive frequency
All of these choices are correct
E4D08: What causes intermodulation in an electronic circuit?
Too little gain
Lack of neutralization
Nonlinear circuits or devices
Positive feedback
E4E09: What undesirable effect can occur when using an IF noise blanker?
Received audio in the speech range might have an echo effect
The audio frequency bandwidth of the received signal might be compressed
Nearby signals may appear to be excessively wide even if they meet emission standards
FM signals can no longer be demodulated
E5A17: What is the resonant frequency of a parallel RLC circuit if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?
10.1 MHz
63.2 MHz
10.1 kHz
63.2 kHz
E5B04: What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all in parallel?
55 seconds
110 seconds
440 seconds
220 seconds
E5C15: In polar coordinates, what is the impedance of a circuit of 100 -j100 ohms impedance?
141 ohms at an angle of -45 degrees
100 ohms at an angle of 45 degrees
100 ohms at an angle of -45 degrees
141 ohms at an angle of 45 degrees
E5D18: How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500 VA?
704 W
355 W
252 W
1.42 mW
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
E6B03: What special type of diode is capable of both amplification and oscillation?
Point contact
Zener
Tunnel
Junction
E6C07: In Figure E6-5, what is the schematic symbol for an AND gate?
1
2
3
4
E6D12: How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?
35 turns
13 turns
79 turns
141 turns
E6E08: How is power-supply voltage normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?
Through a resistor and/or RF choke connected to the amplifier output lead
MMICs require no operating bias
Through a capacitor and RF choke connected to the amplifier input lead
Directly to the bias-voltage (VCC IN) lead
E6F10: What is the most common type of photovoltaic cell used for electrical power generation?
Selenium
Silicon
Cadmium Sulfide
Copper oxide
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
E7B21: Which of the following devices is generally best suited for UHF or microwave power amplifier applications?
Field effect transistor
Nuvistor
Silicon controlled rectifier
Triac
E7C09: What type of digital signal processing filter might be used to generate an SSB signal?
An adaptive filter
A notch filter
A Hilbert-transform filter
An elliptical filter
E7D02: What is one characteristic of a switching electronic voltage regulator?
The resistance of a control element is varied in direct proportion to the line voltage or load current
It is generally less efficient than a linear regulator
The control device's duty cycle is controlled to produce a constant average output voltage
It gives a ramp voltage at its output
E7E07: What is meant by the term baseband in radio communications?
The lowest frequency band that the transmitter or receiver covers
The frequency components present in the modulating signal
The unmodulated bandwidth of the transmitted signal
The basic oscillator frequency in an FM transmitter that is multiplied to increase the deviation and carrier frequency
E7F07: What determines the accuracy of a frequency counter?
The accuracy of the time base
The speed of the logic devices used
Accuracy of the AC input frequency to the power supply
Proper balancing of the mixer diodes
E7G03: Which of the following is an advantage of using an op-amp instead of LC elements in an audio filter?
Op-amps are more rugged
Op-amps are fixed at one frequency
Op-amps are available in more varieties than are LC elements
Op-amps exhibit gain rather than insertion loss
E7H10: What information is contained in the lookup table of a direct digital frequency synthesizer?
The phase relationship between a reference oscillator and the output waveform
The amplitude values that represent a sine-wave output
The phase relationship between a voltage-controlled oscillator and the output waveform
The synthesizer frequency limits and frequency values stored in the radio memories
E8A14: Which of these methods is commonly used to convert analog signals to digital signals?
Sequential sampling
Harmonic regeneration
Level shifting
Phase reversal
E8B01: What is the term for the ratio between the frequency deviation of an RF carrier wave, and the modulating frequency of its corresponding FM-phone signal?
FM compressibility
Quieting index
Percentage of modulation
Modulation index
E8C11: What spread-spectrum communications technique uses a high speed binary bit stream to shift the phase of an RF carrier?
Frequency hopping
Direct sequence
Binary phase-shift keying
Phase compandored spread-spectrum
E8D04: What is the PEP output of a transmitter that develops a peak voltage of 30 volts into a 50-ohm load?
4.5 watts
9 watts
16 watts
18 watts
E9A09: What is meant by antenna bandwidth?
Antenna length divided by the number of elements
The frequency range over which an antenna satisfies a performance requirement
The angle between the half-power radiation points
The angle formed between two imaginary lines drawn through the element ends
E9B07: How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from an isotropic antenna, assuming each is driven by the same amount of power?
The total amount of radiation from the directional antenna is increased by the gain of the antenna
The total amount of radiation from the directional antenna is stronger by its front to back ratio
They are the same
The radiation from the isotropic antenna is 2.15 dB stronger than that from the directional antenna
E9C04: Which of the following describes a basic unterminated rhombic antenna?
Unidirectional; four-sides, each side one quarter-wavelength long; terminated in a resistance equal to its characteristic impedance
Bidirectional; four-sides, each side one or more wavelengths long; open at the end opposite the transmission line connection
Four-sides; an LC network at each corner except for the transmission connection;
Four-sides, each of a different physical length
E9D13: What happens to feed point impedance at the base of a fixed-length HF mobile antenna as the frequency of operation is lowered?
The radiation resistance decreases and the capacitive reactance decreases
The radiation resistance decreases and the capacitive reactance increases
The radiation resistance increases and the capacitive reactance decreases
The radiation resistance increases and the capacitive reactance increases
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
E9F09: What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?
10 meters
6.9 meters
24 meters
50 meters
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
E9H12: What is an advantage of using a shielded loop antenna for direction finding?
It automatically cancels ignition noise pickup in mobile installations
It is electro-statically balanced against ground, giving better nulls
It eliminates tracking errors caused by strong out-of-band signals
It allows stations to communicate without giving away their position
