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practice exams - Extra Class

What is an advantage of using digital signals instead of analog signals to convey the same information? (E8A12)
What does SAR measure? (E0A08)
What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain? (E9A16)
How does the gain of an ideal parabolic dish antenna change when the operating frequency is doubled? (E9D01)
What is the triangulation method of direction finding? (E9H06)
Which semiconductor material contains excess holes in the outer shell of electrons? (E6A15)
What is a phase-locked loop circuit? (E7H14)
What function can a Fast Fourier Transform perform? (E7F07)
What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission? (E8C07)
What are three oscillator circuits used in Amateur Radio equipment? (E7H01)
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? (E9E09)
Which of the following indicates that a silicon NPN junction transistor is biased on? (E6A07)
What is an advantage of CMOS logic devices over TTL devices? (E6C05)
What is the function of a reactance modulator? (E7E02)
What is the velocity factor of a transmission line? (E9F01)
What impedance does a 1/4 wavelength transmission line present to a generator when the line is shorted at the far end? (E9F13)
What type of transmission is most often used for a ham radio mesh network? (E2C04)
What is the definition of the term telemetry? (E1D01)
Which of these digital modes has the narrowest bandwidth? (E2E10)
What is a disadvantage of using a multiband trapped antenna? (E9D05)
What is one advantage of using ASCII code for data communications? (E8D11)
Why are switching amplifiers more efficient than linear amplifiers? (E7B14)
What do the subscripts of S parameters represent? (E4B07)
Which of the following descriptors indicates the greatest solar flare intensity? (E3C07)
Which of the following best describes the Volunteer Examiner accreditation process? (E1E04)
By how much does the VHF/UHF radio horizon distance exceed the geometric horizon? (E3C06)
What does the space weather term G5 mean? (E3C08)
Which 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? (E4E11)
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 maximum permissible duration of a remotely controlled station’s transmissions if its control link malfunctions? (E1C08)
What is susceptance? (E5B06)
What is a Class D amplifier? (E7B02)
How are analog SSTV images typically transmitted on the HF bands? (E2B12)
What types of communications may be transmitted to amateur stations in foreign countries? (E1C12)
Where should a high Q loading coil be placed to minimize losses in a shortened vertical antenna? (E9D03)
What is the packaging technique in which leadless components are soldered directly to circuit boards? (E6E10)
Which amateur service HF bands have frequencies authorized for space stations? (E1D07)
What core material property determines the inductance of a toroidal inductor? (E6D06)
Which amateur stations may be operated under RACES rules? (E1B09)
How many lines are commonly used in each frame of an amateur slow-scan color television picture? (E2B13)
What do the two numbers that are used to define a point on a graph using rectangular coordinates represent? (E5C11)
Which of the following is caused by missing codes in an SDR receiver’s analog-to-digital converter? (E4C16)
What does the impedance 50–j25 represent? (E5C06)
What are the majority charge carriers in N-type semiconductor material? (E6A16)
Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR? (E4A07)
What is a vector? (E5C07)
What digital process is applied to I and Q signals in order to recover the baseband modulation information? (E7F12)
What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals? (E4E13)
Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television? (E2B08)
What is considered a good minimum IMD level for an idling PSK signal? (E8D09)