- What term means the number of times per second that an alternating
current flows back and forth?
A. Speed.
B. Pulse rate.
C. Frequency.
D. Inductance.
- Approximately what frequency range can most humans hear?
A. 200,000 30,000 Hz
B. 200 200,000 Hz.
C. 20 20,000 Hz.
D. 0 20 Hz.
- Why do we call signals in the range of 20 Hz to 20,000 Hz audio frequencies?
A. Because the human ear cannot sense anything in this range.
B. Because this range is too low for radio energy.
C. Because the human ear can sense radio waves in this range.
D. Because the human can sense sounds in this range.
- Electrical energy at a frequency of 7125 kHz is in what frequency range?
A. Radio.
B. Audio.
C. Hyper.
D. Super-high.
- What is the name for the distance an AC signal travels during one complete
cycle?
A. Wavelength.
B. Wave speed.
C. Waveform.
D. Wave spread.
- What happens to a signal's wavelength as its frequency increases?
A. It gets longer.
B. It stays the same.
C. It disappears.
D. It gets shorter.
- What happens to a signals frequency as its wavelength gets longer?
A. It disappears
B. It stays the same.
C. It goes down.
D. It goes up.
- What does 60 hertz mean?
A. 6000 meters per second.
B. 60 cycles per second.
C. 60 meters per second.
D. 6000 cycles per second.
- If the frequency of the waveform is 100 Hz, the time for one cycle is:
A. 10 seconds.
B. 0.0001 seconds.
C. 0.01 seconds.
D. 1 second.
- Current in an AC circuit goes through a complete cycle in 0.1 second. This means
the AC has a frequency of:
A. 10 Hz.
B. 1 Hz.
C. 100 Hz.
D. 1000 Hz.
- A signal is composed of a fundamental frequency of 2 kHz and another of 4kHz.
This 4 kHz signal is referred to as:
A. a fundamental of the 2 kHz signal.
B. the DC component of the main signal.
C. a dielectric signal of the main signal.
D. a harmonic of the 2 kHz signal.