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Question

Name a device which is commonly used to convert an electric signal into a visual signal

A
Cathode ray tube
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B
Transducer
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C
RMS converter
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D
None of the above
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Solution

The correct option is A Cathode ray tube
Cathode-ray tubes that are used to convert electric signals into visible images may be divided into, for example, the following categories: television picture tubes, or kinescopes; cathode-ray oscillograph tubes; numerical indicator tubes; the indicator tubes used in radar sets

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