Hamcestry - plant and  grow your amateur radio family tree

plant and grow your
amateur radio family tree

Login Register

practice exams - Extra Class

Which of the following is required in order to operate in accordance with CEPT rules in foreign countries where permitted? (E1C13)
Which amateur stations are eligible to be telecommand stations? (E1D10)
Why is chordal hop propagation desirable? (E3B13)
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? (E9F09)
What is the significance of voltmeter sensitivity expressed in ohms per volt? (E4B12)
What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission? (E2B11)
What type of logic defines "0" as a high voltage? (E7A12)
Under what circumstances might the FCC issue a Special Temporary Authority (STA) to an amateur station? (E1F06)
What happens to feed point impedance at the base of a fixed length HF mobile antenna as the frequency of operation is lowered? (E9D10)
What type of amplifier circuit is shown in Figure E7-1? (E7B12)
What characteristics of the MMIC make it a popular choice for VHF through microwave circuits? (E6E06)
What is vestigial sideband modulation? (E2B06)
When several electrolytic filter capacitors are connected in series to increase the operating voltage of a power supply filter circuit, why should resistors be connected across each capacitor? (E7D16)
How is the Q of an RLC parallel resonant circuit calculated? (E5A09)
What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance? (E5A06)
When scheduling EME contacts, which of these conditions will generally result in the least path loss? (E3A03)
Which of the following signals might a receiver noise blanker be able to remove from desired signals? (E4E03)
How many elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2? (E9B16)
Which of the following can divide the frequency of a pulse train by 2? (E7A03)
Which of the following HF digital modes uses variable-length coding for bandwidth efficiency? (E2E09)
Which of the following can be used as a relative measurement of the Q for a series-tuned circuit? (E4B15)
What is the magnitude of the current at the input of a parallel RLC circuit at resonance? (E5A07)
What is the purpose of Q1 in the circuit shown in Figure E7-3? (E7D06)
Which of the following describes a type of semiconductor diode? (E6B08)
When evaluating RF exposure levels from your station at a neighbor’s home, what must you do? (E0A02)
What is the front-to-back ratio of the radiation pattern shown in Figure E9-2? (E9B15)
Which of the following describes an extended double Zepp antenna? (E9C12)
How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance? (E4B11)
What is used to control the attenuation of RF signals by a PIN diode? (E6B11)
When performing phase shift keying, why is it advantageous to shift phase precisely at the zero crossing of the RF carrier? (E8C03)
How can you determine if line noise interference is being generated within your home? (E4E07)
Why is it advisable to use an RF attenuator on a receiver being used for direction finding? (E9H07)
Which of the following represents a capacitive reactance in rectangular notation? (E5C01)
Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages? (E6E12)
Which amateur stations are eligible to operate as Earth stations? (E1D11)
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 does the space weather term G5 mean? (E3C08)
What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms? (E7G10)
What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms? (E7G11)
How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz? (E9F07)
What is meant by local control? (E1C07)
What is a common cause of overmodulation of AFSK signals? (E8D07)
Which of the following is an advantage of BiCMOS logic? (E6C13)
How is Forward Error Correction implemented? (E8C01)
What type of satellite appears to stay in one position in the sky? (E2A13)
Who may be the control operator of an auxiliary station? (E1F12)
What is the orbital period of an Earth satellite? (E2A03)
Which describes a microphonic? (E7H02)
What type of wave does a Fourier analysis show to be made up of sine waves of a given fundamental frequency plus all of its harmonics? (E8A03)
What is current in the primary winding of a transformer called if no load is attached to the secondary? (E6D15)