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For what purpose was twisted pair cable first used?

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For what purpose was twisted pair cable first used?

(a) AM

(b) Telephone

(c) Wi-Fi

(d) Digital data transmission

This question was addressed to me during an internship interview.

Question is from Transmission Line Basics topic in portion Transmission Lines of Avionics

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Correct option is (b) Telephone

The explanation is: Twisted-pair cable uses two insulated solid copper wires covered with insulation and loosely twisted together. This type of cable was first used in telephone wiring and is still used for that today. But it is also used for security system wiring of sensors and other equipment.

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