ELECTRONIC DEVICES — Acronym expansion In semiconductor electronics, what does the acronym 'BJT' stand for?

Introduction / Context:
Transistors are foundational to analog and digital circuits. The BJT is one of the two cornerstone transistor families, the other being the MOSFET. Knowing the expansion helps you decode datasheets and circuit discussions.

Given Data / Assumptions:

• The acronym to expand is BJT.
• We are selecting among similarly sounding distractors.
• No circuit analysis is required; this is terminology.

Concept / Approach:
BJT expands to Bipolar Junction Transistor. “Bipolar” reflects that both electrons and holes participate in conduction. “Junction” indicates PN junctions (two junctions for a transistor). “Transistor” describes a device that controls a large current with a small input current.

Step-by-Step Solution:
Recall that BJTs have two PN junctions → emitter–base and base–collector.Because both charge carriers are involved, the device is called bipolar.Therefore, the correct expansion is Bipolar Junction Transistor.

Verification / Alternative check:
Standard textbooks and datasheets (e.g., for 2N2222, BC547) list device type as “NPN/PNP Bipolar Junction Transistor.”

Why Other Options Are Wrong:
Bit Junction Transfer/Bell Jar/Back Junction/Binary Junction — invented or incorrect phrases; not used in electronics nomenclature.

Common Pitfalls:
Confusing BJTs with MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors). MOSFETs are unipolar devices relying mainly on one type of charge carrier.

Final Answer:
Bipolar Junction Transistor