Class 4 (4th Engineer) MET 📅 Oct 2022

Exam Question

(a) Explain the factors which govern the variation of resistance of conductors. (6)

(b) A 2-core cable, each core of which is 300 m long and of uniform cross-sectional area of 150 mm2 is fed from one end at 240V. A load of 200A is taken off from the centre of the cable and a load of 100A from the far end. Calculate the voltage at each load. A single-core cable of similar material 880 m in length and of uniform cross-sectional area of 50mm2 has a resistance of 0.219Ω. (10)

Reference Answer

### (a) Factors Governing the Variation of Resistance of Conductors (6 Marks)
The electrical resistance (R) of a conductor, measured in Ohms (Ω), is the opposition to the passage of electric current. It is governed by four primary factors, as defined by the formula:
$$ R = \frac{\rho L}{A} $$
Where:

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