Correct option is D
A "Megger" is considered an insulation tester; hence, the answer is (d) Megger.
Explanation: A Megger is a specialized instrument designed to measure high insulation resistance, essentially acting as an insulation tester.
points about Meggers:
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Function: It applies a high DC voltage to the circuit under test and measures the small current that flows through the insulation, indicating its quality.
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Measurement unit: Insulation resistance is typically measured in megaohms.
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Operation: Most Meggers have a hand-cranked generator to produce the test voltage.
