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The non rectifying base contact is made from_________

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The non rectifying base contact is made from_________

(a) welding a strip

(b) germanium

(c) indium

(d) graphite

This question was posed to me in an international level competition.

I want to ask this question from Transistor Construction in chapter Transistor Characteristics of Electronic Devices & Circuits

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Right choice is (a) welding a strip

The explanation: Leads for emitter and collector are soldered to the dots making non rectifying contacts. Further, non rectifying base contact is usually made from a welding a strip or loop of gold plated wire to the base plate.

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