The h-parameter equivalent circuit of a is valid for: 

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  1. small signal operation at low frequencies
  2. large signal operation at low frequencies
  3. small signal operation at high frequencies
  4. large signal operation at high frequencies

Answer (Detailed Solution Below)

Option 1 : small signal operation at low frequencies
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The h-parameters model doesn’t take into account junction capacitance which are significant at high frequencies.

The h-parameter model is valid for signals with Vbe < 10 mV. Hence h-parameter model is suitable for low frequencies & small signals

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