Canadian Basic pool, section 5-07

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Subelement 5

Basic Electronics and Theory

Section 5-07

AC, sinewave, frequency, frequency units

5-07-01

What term means the number of times per second that an alternating current flows back and forth?

A.
Speed
B.
Pulse rate
Correct Answer
C.
Frequency
D.
Inductance

5-07-01

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5-07-02

Approximately what frequency range can most humans hear?

A.
20 000 - 30 000 Hz
B.
200 - 200 000 Hz
Correct Answer
C.
20 - 20 000 Hz
D.
0 - 20 Hz

5-07-02

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5-07-03

Why do we call signals in the range 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
Correct Answer
D.
Because the human ear can sense sounds in this range

5-07-03

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5-07-04

Electrical energy at a frequency of 7125 kHz is in what frequency range?

Correct Answer
A.
Radio
B.
Audio
C.
Hyper
D.
Super-high

5-07-04

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5-07-05

What is the name for the distance an AC signal travels during one complete cycle?

Correct Answer
A.
Wavelength
B.
Wave speed
C.
Waveform
D.
Wave spread

5-07-05

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5-07-06

What happens to a signal's wavelength as its frequency increases?

A.
It gets longer
B.
It stays the same
C.
It disappears
Correct Answer
D.
It gets shorter

5-07-06

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5-07-07

What happens to a signal's frequency as its wavelength gets longer?

A.
It disappears
B.
It stays the same
Correct Answer
C.
It goes down
D.
It goes up

5-07-07

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5-07-08

What does 60 hertz (Hz) mean?

A.
6000 metres per second
Correct Answer
B.
60 cycles per second
C.
60 metres per second
D.
6000 cycles per second

5-07-08

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5-07-09

If the frequency of the waveform is 100 Hz, the time for one cycle is:

A.
10 seconds
B.
0.0001 second
Correct Answer
C.
0.01 second
D.
1 second

5-07-09

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5-07-10

Current in an AC circuit goes through a complete cycle in 0.1 second. This means the AC has a frequency of:

Correct Answer
A.
10 Hz
B.
1 Hz
C.
100 Hz
D.
1000 Hz

5-07-10

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5-07-11

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.
a fundamental of the 2 kHz signal
B.
the DC component of the main signal
C.
a dielectric signal of the main signal
Correct Answer
D.
a harmonic of the 2 kHz signal

5-07-11

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