Which of the following are needed both for protection and metering?

1.

Which of the following are needed both for protection and metering?

[A].	Wattmeters
[B].	Instrument transformers
[C].	Energy meters
[D].	Power factor meters

Answer: Option B

Explanation:

Instrument transformers are used to measure high currents and voltages. They also feed the relays for protection.

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