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The field resistance of a dc machine is 50 ohm at 20oC. The resistance increases to 55 ohm at 50oC. Find the temperature coefficient of the resistance material.
Ans:
Solution:
R = Ro[1 + α(t-to) where R and Ro are resistances at 50oC and 20oC
50 x 30 x α = 5
α = 5/1500= 3.3 x 10-3/oC
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