Question

What is the melting point of indium in alloy type transistors?

(a) 300°C

(b) 200°C

(c) 155°C

(d) 100°C

I have been asked this question in an online quiz.

My doubt is from Transistor Construction topic in section Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Correct answer is (c) 155°C

Explanation: This is similar to soldering and PNP transistor is generally is made by this process. In this method, first of all N type germanium is obtained. The N type wafer and indium dots are placed in a furnace and heated to about 500°C.