Discipline-Specific Technical Knowledge
Discipline-Specific Technical Knowledge is the post-code section: Accounts, Civil/Electrical/Mechanical Engineering, Laboratory, or Hindi. It rewards depth in your own stream, not general aptitude. The exact weight varies by post and phase, so confirm the current notification; the content below is a revision frame, not a substitute for the official syllabus.
Core rules by stream
- Accounts: double-entry always keeps assets = liabilities + equity. Revenue and expense affect equity; capital and drawings are owner transactions. Depreciation: straight-line = (cost − residual)/life; written-down value applies a fixed rate to the opening book value.
- Engineering: civil - BMD/SFD sign conventions, concrete mix and soil bearing; electrical - Ohm's law, power P=VI, AC impedance; mechanical - thermodynamics laws, stress-strain, gear ratios. Always carry units.
- Laboratory: distinguish accuracy from precision; titration endpoint vs equivalence point; use calibrated glassware and record significant figures.
- Hindi: official-language terminology, translation fidelity, and prescribed grammar.
Worked example
A machine costs ₹5,00,000, residual value ₹20,000, useful life 8 years. Find annual straight-line depreciation. Depreciable amount = 5,00,000 − 20,000 = ₹4,80,000. Annual depreciation = 4,80,000 ÷ 8 = ₹60,000. If the question asked for written-down value at 10%, you would instead apply 10% to the opening book value each year, not to the depreciable amount.
Traps
- Using WDV when SLM is specified, or ignoring residual value.
- Sign errors in shear-force/bending-moment diagrams.
- Mixing accuracy and precision in lab reports.
- Literal translation that violates official Hindi terminology.