Question
Megger is an instrument used to measure ______.
This question was previously asked in
RRB JE 2025 CBT 2 Mechanical and Allied Engg Question Paper English (2-Jul-2026) (Shift-1)
The correct answer is
High resistance.
A Megger (Megohmmeter) is used to measure:
- High resistance values — typically in the megaohm (MΩ) range.
- Most commonly used for insulation resistance testing of cables, motors, transformers, and switchgear.
- It applies a high DC voltage (500V, 1000V, or 2500V) and measures the resulting small current to calculate resistance.
A Megger is NOT used to measure current, EMF sources, or as a null detector.
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Important Questions from Measurement of Resistance
Which of these instruments is used for measuring the insulation resistance?
A ______ is a combined unit of ampere meter, voltmeter and ohmmeter.
A zero to 300 V voltmeter has an error of 2% of the full scale deflection. If the true voltage is 30 V, then the range of readings on this voltmeter would be
The operating voltage of a megger is about
Which instrument is used to measure the high resistance?
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