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

E1A12: With your transceiver displaying the carrier frequency of CW signals, you hear a DX station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same frequency?

Yes, the DX station initiated the contact
Yes, the displayed frequency is within the 80 meter CW band segment
No, sidebands from the CW signal will be out of the band.
No, USA stations are not permitted to use CW emissions below 3.525 MHz

E1B05: What is the maximum bandwidth for a data emission on 60 meters?

60 Hz
170 Hz
1.5 kHz
2.8 kHz

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

E1D10: Which amateur stations are eligible to be telecommand stations?

Any amateur station designated by NASA
Any amateur station so designated by the space station licensee, subject to the privileges of the class of operator license held by the control operator
Any amateur station so designated by the ITU
All of these choices are correct

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

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

E2A11: What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

A linearly polarized antenna
A circularly polarized antenna
An isotropic antenna
A log-periodic dipole array

E2B02: How many horizontal lines make up a fast-scan (NTSC) television frame?

30
60
525
1080

E2C09: How does the spread-spectrum technique of frequency hopping work?

If interference is detected by the receiver it will signal the transmitter to change frequencies
If interference is detected by the receiver it will signal the transmitter to wait until the frequency is clear
A pseudo-random binary bit stream is used to shift the phase of an RF carrier very rapidly in a particular sequence
The frequency of the transmitted signal is changed very rapidly according to a particular sequence also used by the receiving station

E2D04: What is the purpose of digital store-and-forward functions on an Amateur Radio satellite?

To upload operational software for the transponder
To delay download of telemetry between satellites
To store digital messages in the satellite for later download by other stations
To relay messages between satellites

E2E02: What do the letters FEC mean as they relate to digital operation?

Forward Error Correction
First Error Correction
Fatal Error Correction
Final Error Correction

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

E3B07: Which of the following could account for hearing an echo on the received signal of a distant station?

High D layer absorption
Meteor scatter
Transmit frequency is higher than the MUF
Receipt of a signal by more than one path

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

E4A09: Which of the following describes a good method for measuring the intermodulation distortion of your own PSK signal?

Transmit into a dummy load, receive the signal on a second receiver, and feed the audio into the sound card of a computer running an appropriate PSK program
Multiply the ALC level on the transmitter during a normal transmission by the average power output
Use an RF voltmeter coupled to the transmitter output using appropriate isolation to prevent damage to the meter
All of these choices are correct

E4B13: How is the compensation of an oscilloscope probe typically adjusted?

A square wave is displayed and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
A high frequency sine wave is displayed and the probe is adjusted for maximum amplitude
A frequency standard is displayed and the probe is adjusted until the deflection time is accurate
A DC voltage standard is displayed and the probe is adjusted until the displayed voltage is accurate

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

E4D12: What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

Desensitization
Quieting
Cross-modulation interference
Squelch gain rollback

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

E5A09: What is the phase relationship between the current through and the voltage across a parallel resonant circuit at resonance?

The voltage leads the current by 90 degrees
The current leads the voltage by 90 degrees
The voltage and current are in phase
The voltage and current are 180 degrees out of phase

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

E5C20: Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?

Point 1
Point 3
Point 7
Point 8

E5D17: How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200V AC at 5 amperes?

200 watts
1000 watts
1600 watts
600 watts

E6A16: What are the majority charge carriers in N-type semiconductor material?

Holes
Free electrons
Free protons
Free neutrons

E6B07: What is the failure mechanism when a junction diode fails due to excessive current?

Excessive inverse voltage
Excessive junction temperature
Insufficient forward voltage
Charge carrier depletion

E6C11: In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?

2
4
5
6

E6D14: Which is NOT true of a charge-coupled device (CCD)?

It uses a combination of analog and digital circuitry
It can be used to make an audio delay line
It is commonly used as an analog-to-digital converter
It samples and stores analog signals

E6E05: Which of the following noise figure values is typical of a low-noise UHF preamplifier?

2 dB
-10 dB
44 dBm
-20 dBm

E6F05: Which of the following describes an optical shaft encoder?

A device which detects rotation of a control by interrupting a light source with a patterned wheel
A device which measures the strength a beam of light using analog to digital conversion
A digital encryption device often used to encrypt spacecraft control signals
A device for generating RTTY signals by means of a rotating light source.

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

E7B07: Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?

Reduced intermodulation products
Increased overall intelligibility
Signal inversion
Signal distortion and excessive bandwidth

E7C12: Which of the following describes a Pi-L network used for matching a vacuum-tube final amplifier to a 50-ohm unbalanced output?

A Phase Inverter Load network
A Pi network with an additional series inductor on the output
A network with only three discrete parts
A matching network in which all components are isolated from ground

E7D05: Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?

A constant current source
A series regulator
A shunt current source
A shunt regulator

E7E05: What circuit is added to an FM transmitter to boost the higher audio frequencies?

A de-emphasis network
A heterodyne suppressor
An audio prescaler
A pre-emphasis network

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

E7G15: What is the typical output impedance of an integrated circuit op-amp?

Very low
Very high
100 ohms
1000 ohms

E7H09: What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter and a low-pass anti-alias filter?

A direct digital synthesizer
A hybrid synthesizer
A phase locked loop synthesizer
A diode-switching matrix synthesizer

E8A14: Which of these methods is commonly used to convert analog signals to digital signals?

Sequential sampling
Harmonic regeneration
Level shifting
Phase reversal

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

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

E8D06: What is the advantage of using a peak-reading wattmeter to monitor the output of a SSB phone transmitter?

It is easier to determine the correct tuning of the output circuit
It gives a more accurate display of the PEP output when modulation is present
It makes it easier to detect high SWR on the feed line
It can determine if any flat-topping is present during modulation peaks

E9A15: What is meant by the radiation resistance of an antenna?

The combined losses of the antenna elements and feed line
The specific impedance of the antenna
The value of a resistance that would dissipate the same amount of power as that radiated from an antenna
The resistance in the atmosphere that an antenna must overcome to be able to radiate a signal

E9B01: In the antenna radiation pattern shown in Figure E9-1, what is the 3-dB beamwidth?

75 degrees
50 degrees
25 degrees
30 degrees

E9C10: How many elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2?

4
3
1
7

E9D10: What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?

300 ohms
72 ohms
50 ohms
450 ohms

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

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

E9G02: What type of coordinate system is used in a Smith chart?

Voltage circles and current arcs
Resistance circles and reactance arcs
Voltage lines and current chords
Resistance lines and reactance chords

E9H05: What is the main drawback of a wire-loop antenna for direction finding?

It has a bidirectional pattern
It is non-rotatable
It receives equally well in all directions
It is practical for use only on VHF bands