Question 4
- State
- two types of transformer construction;
- two methods of cooling a transformer.
- The copper and iron losses of a 50 kVA transformer are 800 W and 650 W respectively. If the transformer operates at 0.8 power factor lagging, calculate its efficiency at full load.
Observation
The expected response was:
-
- Types of transformer construction
- Shell type
- Core type
- Methods of cooling transformers
- Air
- Oil
- Water
- Types of transformer construction
Many of the candidates did the first part well but could not determine the output from KVA and pf as such could not compute the efficiency.