Technical Subject (Paper II) — Preparation Strategy¶

Scope: Nepal Telecom Level 7, Telecom Engineer — Paper II only (100 marks, fully subjective). Based on: past -c papers (2079, 2081, 2082) + Eng. Sewa 2082/83, mapped to the 03_technical/ notes.

For the overall exam plan (Paper I + priorities), see prepstrategy.md. For the raw question bank, see technical-questions-c.md.

0. How Paper II works¶

• 100% subjective. No MCQs. No calculator-style numerical problems.
• Time: 3 hrs. Sections answered in separate booklets.
• Questions are almost always multi-part (e.g. [4+3+3=10]) — so partial knowledge still scores.
• Only 1 true numerical appeared across all analyzed papers (2081 root locus). Everything else is theory, derivation, comparison, or diagram.

Consequence: prepare to write and draw, not to calculate.

1. Topic priority (built from actual past-paper frequency)¶

Each technical note folder is ranked by how often it appeared in past papers. Study Tier 1 first, then Tier 2, then Tier 3.

🔴 Tier 1 — Appears almost every year (study first)¶

🟠 Tier 2 — Appears regularly (study second)¶

🟡 Tier 3 — Appears occasionally (study last / lighter)¶

2. The 6 must-know question patterns¶

Every technical paper is built from these. Prepare answers in these shapes:

1. "Working principle … with neat diagram" → always draw + label. Rectifier · ADC · DC generator · PLL · optical fiber TIR · thyristor rectifier.
2. "Differentiate / compare X and Y" → 2-column table = fast, guaranteed marks. OSI vs TCP/IP · SMPS vs linear · scalar vs vector potential · DS-SS vs FH-SS · optical tx vs rx · open vs closed loop.
3. "Define / explain the concept of …" → crisp 3–5 line definition + one example. Sampling theorem · NGN · cloud computing · satellite comm · cache memory.
4. "Derive …" → memorize as a reproducible block (see §3).
5. "Classify / list types of …" → bullet list + one line each. Fiber types · antenna types · system bus types · surface-detection techniques.
6. "Draw block diagram and explain each component" → diagram + component-by-component. PCM tx/rx · NGN architecture · counter.

3. Derivations & formulas to memorize (the "numerical-lite" core)¶

You don't solve numericals — you reproduce these on demand:

• DC generator EMF equation — \(E = \dfrac{PΦZN}{60A}\) (know each term)
• Closed-loop transfer function — \(\dfrac{C}{R} = \dfrac{G}{1+GH}\) + pole/zero effect on stability
• Magnetic boundary conditions (normal B, tangential H)
• Skin depth — \(\delta = \dfrac{1}{\sqrt{\pi f \mu \sigma}}\) (2082 asked a plug-in)
• Star↔Delta conversion formulas (2082 asked)
• Radar range equation (Eng. Sewa)
• Sampling theorem — \(f_s \ge 2 f_m\)
• Root-locus procedure — the one numerical type; know the steps: poles/zeros, real-axis segments, asymptotes, breakaway point, angle of departure.

Keep these on a single "derivation sheet" for last-week revision.

4. Study method for the technical paper¶

Fixed answer template (use for every topic)¶

Definition → Labeled diagram → Working principle → Key formula/derivation → Application / comparison

Workflow per topic¶

1. Read the note file once for understanding.
2. Rewrite it into the template above (condensed).
3. Close the note, reproduce the answer + diagram from memory.
4. Tag confidence in the note frontmatter (confidence, reviews, last_reviewed, due) and schedule the next review.

Diagram drill list (practice drawing from memory)¶

1. Rectifiers: full-wave bridge + SCR controlled rectifier (note)
2. Successive-approximation ADC (note)
3. PCM transmitter and receiver (note)
4. Optical-fiber TIR, acceptance cone and fiber types (note)
5. Satellite uplink–transponder–downlink (note)
6. OSI stack, PDUs and TCP/IP mapping (note)
7. NGN layered architecture (note)
8. BPSK/QPSK generation and constellations (note)
9. JK flip-flop from SR flip-flop (note)
10. 2-bit asynchronous counter (note)
11. DC generator construction (note)
12. Telecom-site lightning, earthing and SPD system (note)
13. Root-locus construction (note)
14. Standing-wave formation, nodes and antinodes (note)
15. Port A complement-to-Port B flowchart (note)

Pass standard: redraw each in 90 seconds or less, include every mandatory label, show arrow direction/polarity, and explain the working in 3–5 ordered points without reopening the note.

Compare-sheet¶

One page of all "X vs Y" pairs — this alone covers a large share of marks.

5. Coverage checklist (tick as you finish Tier by Tier)¶

• [ ] Tier 1: rectifiers/power electronics, PCM/conversion, optical fiber, satellite, OSI/NGN, earthing & lightning
• [ ] Tier 2: flip-flops/counters, digital modulation, control systems, antennas, MOSFET/transistors, PLL
• [ ] Tier 3: transforms, EMT/magnetostatics, spread spectrum, AC/machines/star-delta, ICT (bus/cache/cloud)
• [ ] Derivation sheet memorized (§3)
• [ ] All diagrams drawable from memory (§4)
• [ ] Compare-sheet complete
• [ ] ≥ 2 full papers written under timed conditions

6. Exam-day tactics (technical paper)¶

• Read all 12 questions first, attempt your strongest Tier-1 topics early.
• Always draw the diagram — questions explicitly ask for it; it's easy marks.
• In multi-part questions, answer the compare/define sub-parts first (safest marks), then the harder derivation part.
• Structure each long answer: heading → diagram → points → formula → application.
• If the one numerical (e.g. root locus) appears and you're unsure, secure theory marks first, return to it at the end.
• Don't leave any 10-mark question blank — even partial multi-part answers score.

Bottom line¶

The technical paper rewards broad topical coverage + clean diagrams + crisp comparisons, not calculation. Cover Tier 1 completely, then Tier 2, memorize the small derivation set, and drill diagrams and timed answers.