B-005-07: AC, sinewave, frequency, frequency units
B-005-07-01:
What term means the number of times per second that an alternating current flows back and forth?
Frequency
Speed
Pulse rate
Inductance
B-005-07-02:
Approximately what frequency range can most humans hear?
20 - 20 000 Hz
20 000 - 30 000 Hz
200 - 200 000 Hz
0 - 20 Hz
B-005-07-03:
Why do we call signals in the range 20 Hz to 20 000 Hz audio frequencies?
Because the human ear can sense sounds in this range
Because the human ear cannot sense anything in this range
Because this range is too low for radio energy
Because the human ear can sense radio waves in this range
B-005-07-04:
Electrical energy at a frequency of 7125 kHz is in what frequency range?
Radio
Audio
Hyper
Super-high
B-005-07-05:
What is the name for the distance an AC signal travels during one complete cycle?
Wavelength
Wave speed
Waveform
Wave spread
B-005-07-06:
What happens to a signal's wavelength as its frequency increases?
It gets shorter
It gets longer
It stays the same
It disappears
B-005-07-07:
What happens to a signal's frequency as its wavelength gets longer?
It goes down
It disappears
It stays the same
It goes up
B-005-07-08:
What does 60 hertz (Hz) mean?
60 cycles per second
6000 metres per second
60 metres per second
6000 cycles per second
B-005-07-09:
If the frequency of the waveform is 100 Hz, the time for one cycle is:
0.01 second
10 seconds
0.0001 second
1 second
B-005-07-10:
Current in an AC circuit goes through a complete cycle in 0.1 second. This means the AC has a frequency of:
10 Hz
1 Hz
100 Hz
1000 Hz
B-005-07-11:
A signal is composed of a fundamental frequency of 2 kHz and another of 4 kHz. This 4 kHz signal is referred to as:
a harmonic of the 2 kHz signal
a fundamental of the 2 kHz signal
the DC component of the main signal
a dielectric signal of the main signal
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