| 1 | What is the basic unit of frequency? |
A. The hertz B. The watt C. The ampere D. The ohm |
|
|
|
| 2 | Which region of the ionosphere is mainly responsible for absorbing MF/HF radio signals during the daytime? |
A. The F2 region B. The F1 region C. The E region D. The D region |
|
|
|
| 3 | When a signal travels in a straight line from one antenna to another, what is this called?
|
A. Line-of-sight propagation B. Straight line propagation C. Knife-edge diffraction D. Tunnel ducting |
|
|
|
| 4 | How many microfarads is 1,000,000 picofarads?
|
A. 0.001 microfarads B. 1 microfarad C. 1000 microfarads D. 1,000,000,000 microfarads |
|
|
|
| 5 | In Figure T7-1, which symbol represents a fixed-value iron-core inductor? |
A. Symbol 6 B. Symbol 9 C. Symbol 11 D. Symbol 12 |
|
 |
|
|
|
| 6 | What might you connect between your transceiver and an antenna switch connected to several antennas? |
A. A high-pass filter B. An SWR meter C. A key-click filter D. A mixer |
|
|
|
| 7 | What device could boost the low-power output from your hand-held radio up to 100 watts? |
A. A voltage divider B. A power amplifier C. A impedance network D. A voltage regulator |
|
|
|
| 8 | What does vertical wave polarization mean? |
A. The electric lines of force of a radio wave are parallel to the Earth's surface B. The magnetic lines of force of a radio wave are perpendicular to the Earth's surface C. The electric lines of force of a radio wave are perpendicular to the Earth's surface D. The electric and magnetic lines of force of a radio wave are parallel to the Earth's surface |
|
|
|
| 9 | With regard to a transmitter and antenna system, what does "reflected power" mean? |
A. The power radiated down to the ground from an antenna B. The power returned towards the source on a transmission line C. The power produced during the negative half of an RF cycle D. The power returned to an antenna by buildings and trees |
|
|
|
| 10 | Which potential does the green wire in a three-wire electrical plug represent? |
A. Neutral B. Hot C. Hot and neutral D. Ground |
|
|
|
11 |
Which of the following modes of voice communication is most commonly used on the High Frequency Amateur bands? |
A. Frequency modulation (FM) B. Amplitude modulation (AM) C. Single sideband (SSB) D. Phase modulation (PM) |
|
|
|
12 |
What is the "critical angle" as used in radio-wave propagation? |
A. The lowest takeoff angle that will return a radio wave to the earth under specific ionospheric conditions B. The compass direction of a distant station C. The compass direction opposite that of a distant station D. The highest takeoff angle that will return a radio wave to the earth under specific ionospheric conditions |
|
|
|
13 |
What is the name of the process by which sunlight is directly changed into electricity? |
A. Photovoltaic conversion B. Photosensitive conduction C. Photosynthesis D. Photocoupling |
|
|
|
14 |
How does a capacitor react to AC? |
A. As the frequency of the applied AC increases, the reactance decreases B. As the frequency of the applied AC increases, the reactance increases C. As the amplitude of the applied AC increases, the reactance increases D. As the amplitude of the applied AC increases, the reactance decreases |
|
|
|
15 |
What is the voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC? |
A. 2370 volts B. 540 volts C. 26.7 volts D. 5.9 volts |
|
|
|
16 |
In a single-sideband phone transmitter, what circuit processes signals from the carrier oscillator and the speech amplifier and sends signals to the filter? |
A. Mixer B. Detector C. IF amplifier D. Balanced modulator |
|
|
|
17 |
What is one advantage of carrier suppression in a double-sideband phone transmission? |
A. Only half the bandwidth is required for the same information content B. Greater modulation percentage is obtainable with lower distortion C. More power can be put into the sidebands D. Simpler equipment can be used to receive a double-sideband suppressed- |
|
|
|
18 |
What receiver stage combines a 14.25-MHz input signal with a 13.795-MHz oscillator signal to produce a 455-kHz intermediate frequency (IF) signal? |
A. Mixer B. BFO C. VFO D. Multiplier |
|
|
|
19 |
Which of the following is NOT a Yagi antenna design variable that should be considered to optimize the forward gain, front-to-rear ratio and SWR bandwidth? |
A. The physical length of the boom B. The number of elements on the boom C. The spacing of each element along the boom D. The polarization of the antenna elements |
|
|
|
20 |
Approximately how long is each leg of a symmetrical delta-loop antenna driven element for 28.7 MHz? |
A. 8.75 feet B. 11.7 feet C. 23.4 feet D. 35 feet |
|
|
|
21 |
What is the characteristic impedance of flat-ribbon TV-type twin-lead? |
A. 50 ohms B. 75 ohms C. 100 ohms D. 300 ohms |
|
|
|
22 |
Where in the ionosphere does auroral activity occur? |
A. At F-region height B. In the equatorial band C. At D-region height D. At E-region height |
|
|
|
23 |
Which test instrument is used to display intermodulation distortion products in an SSB transmission? |
A. A wattmeter B. A spectrum analyzer C. A logic analyzer D. A time-domain reflectometer |
|
|
|
24 |
What is a loop antenna? |
A. A large circularly-polarized antenna B. A small coil of wire tightly wound around a toroidal ferrite core C. Several turns of wire wound in the shape of a large open coil D. Any antenna coupled to a feed line through an inductive loop of wire |
|
|
|
25 |
What is resonance in an electrical circuit? |
A. The highest frequency that will pass current B. The lowest frequency that will pass current C. The frequency at which capacitive reactance equals inductive reactance D. The frequency at which power factor is at a minimum |
|
|
|
26 |
What is a magnetic field? |
A. Current through the space around a permanent magnet B. The space through which a magnetic force acts C. The space between the plates of a charged capacitor, through which a magnetic force acts D. The force that drives current through a resistor |
|
|
|
27 |
What is an optocoupler? |
A. A resistor and a capacitor B. A frequency modulated helium-neon laser C. An amplitude modulated helium-neon laser D. An LED and a phototransistor |
|
|
|
28 |
What two elements widely used in semiconductor devices exhibit both metallic and nonmetallic characteristics? |
A. Silicon and gold B. Silicon and germanium C. Galena and germanium D. Galena and bismuth |
|
|
|
29 |
What is one common use for PIN diodes? |
A. As a constant current source B. As a constant voltage source C. As an RF switch D. As a high voltage rectifier |
|
|
|
30 |
In Figure E6-5, what is the schematic symbol for an OR gate? |
A. 2 B. 3 C. 4 D. 6 |
|
 |
|
|
|
| 31 | What type of circuit is shown in Figure E7-3? |
A. Switching voltage regulator B. Grounded emitter amplifier C. Linear voltage regulator D. Emitter follower |
|
 |
|
|
|
| 32 | How can an FM-phone signal be produced? |
A. By modulating the supply voltage to a Class-B amplifier B. By modulating the supply voltage to a Class-C amplifier C. By using a reactance modulator on an oscillator D. By using a balanced modulator on an oscillator |
|
|
|
