Technician › T7
T7 Practical Circuits
44 questions in the pool. Your exam will include 4, one from each group below.
T7A
Station equipment: receivers, transceivers, transmitter amplifiers, RF preamplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, Push-To-Talk (PTT), VFO, modulation
- T7A01Which term describes the ability of a receiver to detect the presence of a signal?
- T7A02What is a transceiver?
- T7A03Which of the following is used to convert a signal from one frequency to another?
- T7A04Which term describes the ability of a receiver to discriminate between multiple signals?
- T7A05What is the name of a circuit that generates a signal at a specific frequency?
- T7A06What device converts the RF input and output of a transceiver to another band?
- T7A07What is the function of a transceiver's PTT input?
- T7A08Which of the following describes combining speech with an RF carrier signal?
- T7A09What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?
- T7A10What can be added to the output of a transceiver to increase the transmitted output power?
- T7A11What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?
T7B
Symptoms, causes, and cures of common transmitter and receiver problems: overload and overdrive, distortion, interference and consumer electronics, RF feedback
- T7B01What can you do if you are told your FM handheld or mobile transceiver is over-deviating?
- T7B02What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?
- T7B03Which of the following can cause radio frequency interference?
- T7B04Which of the following might be the cause of low RF power output from a solid-state transceiver?
- T7B05Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?
- T7B06Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?
- T7B07Which of the following can reduce interference to a 2-meter band transceiver from a nearby commercial FM station?
- T7B08What should you do if something in a neighbor's home is causing harmful interference to your amateur station?
- T7B09What should be the first step to resolve non-fiber optic cable TV interference caused by your amateur radio transmission?
- T7B10What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?
- T7B11Which of the following can eliminate distorted voice transmissions?
T7C
Antenna and transmission line measurements and troubleshooting: measuring SWR, effects of high SWR, causes of feed line failures; Basic coaxial cable characteristics; Use of dummy loads when testing
- T7C01What is the primary purpose of a dummy load?
- T7C02Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
- T7C03What does a typical RF dummy load consist of?
- T7C04What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?
- T7C05Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?
- T7C06What does an SWR reading of 4:1 indicate?
- T7C07What happens to power lost in a feed line?
- T7C08Which instrument can be used to determine SWR?
- T7C09Which of the following causes failure of coaxial cables?
- T7C10Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
- T7C11What is an advantage of foam-dielectric versus solid-dielectric coaxial cable?
T7D
Using basic test instruments: voltmeter, ammeter, and ohmmeter; Soldering
- T7D01Which instrument would you use to measure electric potential?
- T7D02How is a voltmeter connected to a component to measure applied voltage?
- T7D03When configured to measure current, how is a multimeter connected to a component?
- T7D04Which instrument is used to measure electric current?
- T7D05How does an ohmmeter measure the resistance of a circuit or component?
- T7D06Which of the following can damage a multimeter?
- T7D07Which of the following measurements are made using a multimeter?
- T7D08Which of the following types of solder should not be used for radio and electronic applications?
- T7D09What is the characteristic appearance of a cold tin-lead solder joint?
- T7D10What reading indicates that an ohmmeter is connected across a large, discharged capacitor?
- T7D11Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?