Dogcare manager interview questions and answers

30. Explain different losses in a transformer.
There are two types of losses occurring in transformer:
• Constant losses or Iron losses: The losses that occur 
in the core are known as core losses or iron losses. Two 
types of iron losses are:
- eddy current loss
- Hysteresis loss.
These losses depend upon the supply voltage, 
frequency, core material and its construction. As long 
as supply voltage and frequency is constant, these 
losses remain the same whether the transformer is 
loaded or not. These are also known as constant losses.
• Variable losses or copper losses: when the 
transformer is loaded, current flows in primary and 
secondary windings, there is loss of electrical energy 
due to the resistance of the primary winding, and 
secondary winding and they are called variable losses. 
These losses depend upon the loading conditions of the 
transformers. Therefore, these losses are also called as 
variable losses.
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