Electronics Engineering Interview Question:

Tell me why the shape of OP-AMP is triangular not other shape?

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The Triangular shape symbolizes that it works for continous signals and hence forth it is an analog device.
ex: Opamp

If it is square then it is digital device.
ex: Multiplexer

If the shape is both triangular and square then it is mixed signal device.
ex: ADC, DAC
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