Electronics - Alternating Current vs Direct Current

Exercise :: Alternating Current vs Direct Current - General Questions

31. 

What is the name of a device that converts sound waves to electrical waves?

A. an amplifier
B. an antenna
C. a filter
D. a microphone

Answer: Option D

Explanation:

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32. 

If the frequency of a radio wave is increased, then its wavelength will:

A. increase
B. decrease
C. remain the same
D. cannot tell

Answer: Option B

Explanation:

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33. 

What is the rms voltage value of an ac signal whose peak oscilloscope display uses 3 major divisions above the zero setting? (V/cm = 5)

A. 5.3 V
B. 10.6 V
C. 15.0 V
D. 21.2 V

Answer: Option B

Explanation:

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34. 

What is the peak-to-peak current value when an ammeter measures a 20 mA value?

A. 14 mA
B. 28 mA
C. 40 mA
D. 57 mA

Answer: Option D

Explanation:

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35. 

How long would it take to transmit an electromagnetic wave to a receiving antenna 1,000 miles away?

A. 5.38 ms
B. 10.8 ms
C. 53.8 ms
D. 108 ms

Answer: Option A

Explanation:

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