Electrical Inspection, Testing and Certification Practice Exam

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What is the result at the board if insulation resistance values of 10Mohm, 5Mohm, 4Mohm, and 6Mohm are recorded?

  1. 1.4 Mohm

  2. 24 Mohm

  3. 2.5 Mohm

  4. 15 Mohm

The correct answer is: 1.4 Mohm

To determine the insulation resistance at the board with the recorded values, it's essential to understand how to combine insulation resistance measurements. Insulation resistance is typically evaluated in parallel when multiple measurements are taken from different parts of the system. The resistance values given—10 Mohm, 5 Mohm, 4 Mohm, and 6 Mohm—can be combined using the formula for resistances in parallel, which states that the equivalent resistance (R_total) can be calculated as: 1/R_total = 1/R1 + 1/R2 + 1/R3 + 1/R4 In this case, the calculation would be: 1/R_total = 1/10 + 1/5 + 1/4 + 1/6 Calculating each term, we find: - 1/10 = 0.1 - 1/5 = 0.2 - 1/4 = 0.25 - 1/6 ≈ 0.1667 Now, adding these values together gives: 1/R_total ≈ 0.1 + 0.2 + 0.25 + 0.1667 ≈ 0.7167 To find

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