Telephone companies normally provide a voltage of __________ to power telephones
The normal telephone central-office battery supply is nominally -48 volts DC. The negative sign specifies its polarity relative to ground; the supply magnitude is 48 volts.
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Telephone companies normally provide a voltage of __________ to power telephones
Answer and explanation
Correct answer D
The normal telephone central-office battery supply is nominally -48 volts DC. The negative sign specifies its polarity relative to ground; the supply magnitude is 48 volts.
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Tamil Nadu SET (TNSET)