SSE JE Electrical Engineering 28 Oct 2020 Shift 1 Papers

Question : 187 of 200

Marks: +1, -0

A uniform two-wire DC distributor that is 200 m long is loaded with 2 amperes/meter. Resistance of single wire is 0.3 Ω/km. Calculate the maximum voltage drop if the distributor is fed from one end.

12 V
6 V
24 V
36 V

Validate

Solution:

Length of distributor = 200 m = 0.2 km
Current supplied by distributor = 2 amperes/meter
Total current supplied by distributor (I) = 200 × 2 = 400 A
The resistance of single wire = 0.3 Ω/km
Total resistance = 0.3 × 0.2 = 0.06 Ω
Maximum voltage drop

={\IR}/2=1/2×400×0.06

=12\V

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