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
E1A04: With your transceiver displaying the carrier frequency of phone signals, you hear a DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower sideband on the same frequency?

Yes, because the DX station initiated the contact
Yes, because the displayed frequency is within the 75 meter phone band segment
No, my sidebands will extend beyond the edge of the phone band segment
No, USA stations are not permitted to use phone emissions below 3.610 MHz
E1B05: What is the maximum bandwidth for a data emission on 60 meters?

60 Hz
170 Hz
1.5 kHz
2.8 kHz
E1C09: Which of these frequencies are available for an automatically controlled repeater operating below 30 MHz?

18.110 - 18.168 MHz
24.940 - 24.990 MHz
10.100 - 10.150 MHz
29.500 - 29.700 MHz
E1D01: What is the definition of the term telemetry?

One-way transmission of measurements at a distance from the measuring instrument
Two-way radiotelephone transmissions in excess of 1000 feet
Two-way single channel transmissions of data
One-way transmission that initiates, modifies, or terminates the functions of a device at a distance
E1E08: To which of the following examinees may a VE not administer an examination?

Employees of the VE
Friends of the VE
Relatives of the VE as listed in the FCC rules
All of these choices are correct
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
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
E2B13: How many lines are commonly used in each frame on an amateur slow-scan color television picture?

30 to 60
60 or 100
128 or 256
180 or 360
E2C03: From which of the following bands is amateur radio contesting generally excluded?

30 meters
6 meters
2 meters
33 cm
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
E2E03: How is Forward Error Correction implemented?

By the receiving station repeating each block of three data characters
By transmitting a special algorithm to the receiving station along with the data characters
By transmitting extra data that may be used to detect and correct transmission errors
By varying the frequency shift of the transmitted signal according to a predefined algorithm
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
E3B03: What is the best time of day for transequatorial propagation?

Morning
Noon
Afternoon or early evening
Late at night
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
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
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
E4C10: Which of the following is a desirable amount of selectivity for an amateur RTTY HF receiver?

100 Hz
300 Hz
6000 Hz
2400 Hz
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
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
E5A08: What is the phase relationship between the current through and the voltage across a series 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
E5B12: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms?

76 degrees with the voltage lagging the current
14 degrees with the voltage leading the current
14 degrees with the voltage lagging the current
76 degrees with the voltage leading the current
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
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
E6A13: What do the initials CMOS stand for?

Common Mode Oscillating System
Complementary Mica-Oxide Silicon
Complementary Metal-Oxide Semiconductor
Common Mode Organic Silicon
E6B13: What type of bias is required for an LED to emit light?

Reverse bias
Forward bias
Zero bias
Inductive bias
E6C02: What logic state do the inputs of a TTL device assume if they are left open?

A logic-high state
A logic-low state
The device becomes randomized and will not provide consistent high or low-logic states
Open inputs on a TTL device are ignored
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
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
E6F09: What is the efficiency of a photovoltaic cell?

The output RF power divided by the input dc power
The effective payback period
The open-circuit voltage divided by the short-circuit current under full illumination
The relative fraction of light that is converted to current
E7A04: How many flip-flops are required to divide a signal frequency by 4?

1
2
4
8
E7B12: What type of circuit is shown in Figure E7-1?

Switching voltage regulator
Linear voltage regulator
Common emitter amplifier
Emitter follower amplifier
E7C07: What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

A band-pass filter
A notch filter
A Pi-network filter
An all-pass filter
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
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
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
E7G08: How does the gain of an ideal operational amplifier vary with frequency?

It increases linearly with increasing frequency
It decreases linearly with increasing frequency
It decreases logarithmically with increasing frequency
It does not vary with frequency
E7H14: What is a phase-locked loop circuit?

An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
An electronic circuit also known as a monostable multivibrator
An electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
An electronic circuit consisting of a precision push-pull amplifier with a differential input
E8A08: What is the period of a wave?

The time required to complete one cycle
The number of degrees in one cycle
The number of zero crossings in one cycle
The amplitude of the wave
E8B03: What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency, when the modulating frequency is 1000 Hz?

3
0.3
3000
1000
E8C02: What are some of the differences between the Baudot digital code and ASCII?

Baudot uses four data bits per character, ASCII uses seven or eight; Baudot uses one character as a shift code, ASCII has no shift code
Baudot uses five data bits per character, ASCII uses seven or eight; Baudot uses two characters as shift codes, ASCII has no shift code
Baudot uses six data bits per character, ASCII uses seven or eight; Baudot has no shift code, ASCII uses two characters as shift codes
Baudot uses seven data bits per character, ASCII uses eight; Baudot has no shift code, ASCII uses two characters as shift codes
E8D14: Which of the following is a typical value for the peak-to-peak voltage at a standard U.S. household electrical outlet?

240 volts
120 volts
340 volts
170 volts
E9A03: Which of the following antennas has no gain in any direction?

Quarter-wave vertical
Yagi
Half-wave dipole
Isotropic antenna
E9B04: What may occur when a directional antenna is operated at different frequencies within the band for which it was designed?

Feed point impedance may become negative
The E-field and H-field patterns may reverse
Element spacing limits could be exceeded
The gain may change depending on frequency
E9C07: What type of antenna pattern over real ground is shown in Figure E9-2?

Elevation
Azimuth
Radiation resistance
Polarization
E9D14: Which of the following types of conductor would be best for minimizing losses in a station's RF ground system?

A resistive wire, such as a spark plug wire
A wide flat copper strap
A cable with 6 or 7 18-gauge conductors in parallel
A single 12 or 10-gauge stainless steel wire
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
E9F04: What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

2.70
0.66
0.30
0.10
E9G03: Which of the following is often determined using a Smith chart?

Beam headings and radiation patterns
Satellite azimuth and elevation bearings
Impedance and SWR values in transmission lines
Trigonometric functions
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