Small-signal h-parameters (common-emitter, typical orders of magnitude): Match each parameter symbol to its representative magnitude or unit category. List I List II A. h_ie (input resistance) 1. 49 (current gain h_fe) B. h_re (reverse voltage) 2. 25 × 10^-6 siemens (output conductance h_oe) C. h_fe (forward current gain)3. 2.4 × 10^-4 (dimensionless) D. h_oe (output conductance) 4. 1000 ohms (kΩ range)

Introduction / Context:
h-parameters summarize a BJT’s small-signal behavior. Remembering their typical magnitudes helps you sanity-check datasheets and exam problems quickly.

Given Data / Assumptions:

• Common-emitter configuration assumed.
• Representative (order-of-magnitude) values are used.
• Exact values vary with bias and device type; the goal is correct pairing.

Concept / Approach:

Recall: h_ie is an input resistance (kΩ range), h_re is a very small reverse transfer (10^-4), h_fe is the familiar current gain (tens to hundreds), and h_oe is an output conductance (tens of μS).

Step-by-Step Solution:

Verification / Alternative check:

Typical transistor small-signal models list h_ie in the kilo-ohm range, h_fe near 50–200, h_re in the 10^-4–10^-3 range, and h_oe in tens of μS, confirming the mapping.

Why Other Options Are Wrong:

• Swapping h_ie with a conductance value mixes resistance with siemens.
• Assigning large numeric gain to h_re contradicts its back-transfer meaning.

Common Pitfalls:

Confusing h_fe (current gain) with β in DC; while related, the small-signal and DC operating points may differ.

Final Answer:

A-4, B-3, C-1, D-2