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.

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