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What is the thickness of wafer in the alloy type transistors?

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What is the thickness of wafer in the alloy type transistors?

(a) 1-2m inch

(b) 3-5m inch

(c) 5-6m inch

(d) 4-7m inch

The question was asked by my school principal while I was bunking the class.

Question is taken from Transistor Construction in portion Transistor Characteristics of Electronic Devices & Circuits

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Correct answer is (b) 3-5m inch

Explanation: The wafer of crystal has a 3-5m inch thickness and 80m inch square. This is placed in a graphite jig with a dot of prepared indium. One dot of an indium is 3 times larger than the other.

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