Question
Two single-core power cables have total conductor resistance of 0.7 Ω and 0.5 Ω, respectively, and their insulation resistances (between core and sheath) are 600 MΩ and 900 MΩ, respectively. When the two cables are joined in series, the ratio of insulation resistance to conductor resistance is ______ × 106.
Answer :
300
Rconductor=0.7+0.5=1.2Ω
Rinsulation= 600×900/600+900 = 360MΩ
Rconductor/Rinsulation=300×106
Hence, the correct answer is 300.
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