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The smallest amongst the given transformers is
1. 2 kVA, 500 Hz
2. 2 kVA, 200 Hz
3. 2 kVA, 50 Hz
4. 2 kVA, 700 Hz

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Correct Answer - Option 4 : 2 kVA, 700 Hz

For a fixed kVA rating, more the design frequency of transformer then lesser will be the cross-sectional area of the core. Hence lesser will be the size and weight of the transformer.

From the given options, at 2 kVA 700 Hz transformer is smallest. 

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