Current Ham Radio Test Pools
Select the most correct answer for each question, then submit your practice test to check your score. This practice test randomly pulls one question from each topic in the Amateur Extra pool.
What is the most common method of reducing key clicks?
What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?
What is the function of hysteresis in a comparator?
How many lines are commonly used in each frame of an amateur slow-scan color television picture?
What is the typical bandwidth of a properly modulated MFSK16 signal?
Which S parameter is equivalent to forward gain?
What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?
What impedance does a 1/8 wavelength transmission line present to a generator when the line is open at the far end?
Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products in an SSB transmitter?
Which VHF amateur service bands have frequencies available for space stations?
What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?
Which of the following can divide the frequency of a pulse train by 2?
What is the term for the ratio between the frequency deviation of an RF carrier wave and the modulating frequency of its corresponding FM-phone signal?
What is meant by the radiation resistance of an antenna?
How are the wavelength scales on a Smith chart calibrated?
Which of the following is required for microwave propagation via rain scatter?
What does VOACAP software model?
What is the main reason to use a charge controller with a solar power system?
What is the packaging technique in which leadless components are soldered directly to circuit boards?
Which of these materials is affected the most by photoconductivity?
What is the magnitude of the current at the input of a parallel RLC circuit at resonance?
How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?
Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?
What is the definition of symbol rate in a digital transmission?
How can an oscillator's microphonic responses be reduced?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
Who may be the control operator of an auxiliary station?
What happens as the Q of an antenna increases?
For what portion of a signal cycle does a Class AB amplifier operate?
What is the relationship between the current through an inductor and the voltage across an inductor?
Which semiconductor material contains excess holes in the outer shell of electrons?
What does the abbreviation NEC stand for when applied to antenna modeling programs?
What core material property determines the inductance of a toroidal inductor?
Which of the following is a way to reduce the likelihood of receiver desensitization?
What do the letters I and Q in I/Q Modulation represent?
What type of satellite appears to stay in one position in the sky?
What is a common use for point contact diodes?
With your transceiver displaying the carrier frequency of phone signals, you hear a station calling CQ on 14.349 MHz USB. Is it legal to return the call using upper sideband on the same frequency?
Which of the following measurements is characteristic of a mismatched transmission line?
Which amateur stations may be operated under RACES rules?
What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?
What type of modulation is used for JT65 contacts?
What is the primary function of an external earth connection or ground rod?
What is transequatorial propagation?
What is meant by the term op-amp input offset voltage?
Which of the following statements concerning remotely controlled amateur stations is true?
For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?
What is the function of a sense antenna?
What is a crystal lattice filter?
How does a diode detector function?