EEE BD

19. At relatively light load, transformer efficiency is low because-
A. transformer losses are high
B. secondary output is low
C. fixed loss is high in proportion to the output
D. Cu loss is small

Note:
When a transformer designed to increase voltage from primary to secondary called step-up transformer and when it designed to reduce voltage from primary to secondary called step-down transformer.

Transformer turns ratio k=(n₂/n₁)=(v₂/v₁)=20.
v₁=12 (voltage at primary)
therfore voltage at secondary (v₂)=(k*v₁)=(20*12)=240v.

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EEE MCQ
Most Important Transformer MCQ