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practice exams - Extra Class

Which of the following could account for hearing an echo on the received signal of a distant station? (E3B07)
During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity? (E2C06)
Tropospheric propagation of microwave signals often occurs along what weather related structure? (E3A05)
What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength? (E9B11)
What are the principal frequencies that appear at the output of a mixer circuit? (E7E08)
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? (E8B03)
What should a VE do if a candidate fails to comply with the examiner’s instructions during an amateur operator license examination? (E1E07)
What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically one-half wavelength long at 14.10 MHz? (E9F06)
How does the modulation index of a phase-modulated emission vary with RF carrier frequency (the modulated frequency)? (E8B02)
What is one advantage of using ASCII code for data communications? (E8D11)
Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply? (E6C06)
Why are there separate electric (E) and magnetic (H) field MPE limits? (E0A06)
What is the term for the ratio of the actual speed at which a signal travels through a transmission line to the speed of light in a vacuum? (E9F08)
What is the purpose of the series capacitor in a gamma-type antenna matching network? (E9E04)
Why are third-order intermodulation products created within a receiver of particular interest compared to other products? (E4D11)
Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification? (E1F11)
In Figure E6-5, what is the schematic symbol for a NAND gate? (E6C08)
What is the photovoltaic effect? (E6F04)
What type of digital signal processing filter is used to generate an SSB signal? (E7F03)
What device is typically used as a stable reference voltage in a linear voltage regulator? (E7D03)
What type of computer program technique is commonly used for modeling antennas? (E9B09)
What is the most common type of photovoltaic cell used for electrical power generation? (E6F10)
What is a remotely controlled station? (E1C01)
How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system? (E2B03)
What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain? (E9A15)
Which of the following semiconductor materials contains excess free electrons? (E6A02)
What is the most common configuration of an optoisolator or optocoupler? (E6F03)
Which parasitic characteristic increases with conductor length? (E5D05)
What is meant by circularly polarized electromagnetic waves? (E3A17)
Which of the following is a characteristic of a good DC voltmeter? (E4B08)
What is the time constant of a circuit having two 220 microfarad capacitors and two 1 megohm resistors, all in parallel? (E5B04)
What is meant by the term baseband in radio communications? (E7E07)
How does a diode detector function? (E7E10)
How can linearly polarized Yagi antennas be used to produce circular polarization? (E9D02)
Which type of modulation is common for data emissions below 30 MHz? (E2E01)
Which of the following instrument would be best for measuring the SWR of a beam antenna? (E4A08)
What is the most common method of reducing key clicks? (E8D05)
What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118? (E5A12)
Which of the following best describes the term self-spotting in regards to HF contest operating? (E2C02)
What is a Class D amplifier? (E7B02)
Why is the physical length of a coaxial cable transmission line shorter than its electrical length? (E9F03)
Which of the following factors might cause the physical location of an amateur station apparatus or antenna structure to be restricted? (E1B02)
What does the MDS of a receiver represent? (E4C07)
What may be the penalty for a VE who fraudulently administers or certifies an examination? (E1E09)
What is the result of increasing the Q of an impedance-matching circuit? (E5A17)
In Figure E7-1, what is the purpose of R1 and R2? (E7B10)
Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal? (E7B07)
What is the function of a DX QSL Manager? (E2C05)
What does a third-order intercept level of 40 dBm mean with respect to receiver performance? (E4D10)
Which of the following best describes the Volunteer Examiner accreditation process? (E1E04)