In the lab, a signal generator is used to synthesise a 1 kHz square wave using o

Question

In the lab, a signal generator is used to synthesise a 1 kHz square wave using only 4 frequencies. Which frequencies could be used?

a)

250 Hz, 500 Hz, 750 Hz and 1000 Hz

b)

1 kHz, 2 kHz, 3 kHz and 4 kHz

c)

1 kHz, 2 kHz, 4 kHz and 8 kHz

d)

1 kHz, 3 kHz, 5 kHz and 7 kHz

e)

1 kHz, 1.25 Hz, 1.5 kHz and 2 kHz

f)

None of the above

Please explain...

In the lab, a signal generator is used to synthesise a 1 kHz square wave using only 4 frequencies. Which frequencies could be used?

a)

250 Hz, 500 Hz, 750 Hz and 1000 Hz

b)

1 kHz, 2 kHz, 3 kHz and 4 kHz

c)

1 kHz, 2 kHz, 4 kHz and 8 kHz

d)

1 kHz, 3 kHz, 5 kHz and 7 kHz

e)

1 kHz, 1.25 Hz, 1.5 kHz and 2 kHz

f)

None of the above

Explanation / Answer

1khz is the fundamental, 3khz is the 3rd harmonic , 5khz is the 5th harmmonic and 7 kHz is the 7th harmonic

as they are all odd harmonics the result will be a square wave of resonable acccuracy.

So

d)

1 kHz, 3 kHz, 5 kHz and 7 kHz

d)

1 kHz, 3 kHz, 5 kHz and 7 kHz

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