SSC JE Electrical Engineering 23 Jan 2018 Morning Paper

Given data
R = 30Ω at 20°c
temp coeff α = 0.00305/ degree
At 30°C → R’ = ?
R(30°C) = R (20°C) [1 + αΔT]
= 30 [1 + 0.00305 × (30 – 20)]
= 30 [1 + 0.00305 × 10]
= 30 [1 + 0.0305]
= 30 [1.0305] = 30.915 ≈ 31Ω