The efficiency of a DC machine is generally higher at full load compared to no load. True or False?
Understand the Problem
The question is asking whether the efficiency of a DC machine is generally higher when it is operating at full load relative to when it is not loaded at all (no load). This involves understanding the principles of efficiency in electrical machines.
Answer
True
The final answer is True
Answer for screen readers
The final answer is True
More Information
The efficiency of a DC machine is generally higher at full load because, under no load, the input power is mainly consumed to overcome losses, and thus, the efficiency is low. At full load, a larger portion of the input power is converted into useful work, increasing efficiency.
Tips
A common mistake is to assume that zero load results in greater efficiency because of less strain. However, efficiency is about useful output power, which is minimal at no load.
Sources
- Motor Efficiency - an overview | ScienceDirect Topics - sciencedirect.com
- How is the efficiency of electric motor affected under no load,part ... - researchgate.net
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