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qid 12000 · engineering
Question: The total copper loss of a transformer as determined by a short-circuit test at 20°C is 630 watts, and the copper loss computed from the true ohmic resistance at the same temperature is 504 watts. What is the load loss at the working temperature of 75°C?
- 630 watts
- 672 watts
- 810 watts
- 945 watts
- 750 watts
- 560 watts
- 717 watts
- 126 watts
- 588 watts
- 504 watts
Our answer: G. 717 watts Source quote machine-checked (exact quote)
How it was answered
Multi-step solver (maze), replayed by code
Current source
Electrical Academia, "Effect of Temperature on Resistance / Temperature Coefficient of Resistance"
“Table 1 lists values for x for some metals commonly used for conductors. The values for Nichrome II and constantan show that x is not the actual temperature at which the resistance becomes zero ohms. However, we can use x to calculate resistances within the range of temperatures where the resistance varies linearly with temperature.”
Source quote machine-checked (exact quote)
Earlier version (superseded)
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