Engineering Subject (branch-specific)
The Engineering Subject paper is the branch-specific paper chosen by the candidate: Civil, Mechanical, Electrical and Electronics, Electronics and Communication, Computer Science, Chemical, Mining, Metallurgy and similar diploma streams. It tests core diploma subjects, and most questions are short numericals or direct concept checks.
Core rules
- Electrical/Electronics: network theorems (KCL, KVL, superposition, Thevenin), AC RMS and phase, transformers, machines, diodes and transistors.
- Mechanical/Civil: stress and strain, bending moment, thermodynamics, fluid flow, surveying, concrete mix and reinforcement basics.
- Computer Science: data structures, DBMS normalisation, operating-system scheduling, TCP/IP and programming output.
- Always convert to SI before calculation; keep sign conventions for current, heat and stress consistent.
- For two parallel resistors use R = R1R2/(R1+R2); for more than two, use conductances.
Worked example
A 12 V source feeds 4 ohm and 6 ohm resistors in parallel. Equivalent resistance R = (4 × 6)/(4 + 6) = 2.4 ohm. Total current I = V/R = 12/2.4 = 5 A. The 4 ohm branch carries 12/4 = 3 A and the 6 ohm branch carries 12/6 = 2 A; these sum to 5 A, confirming KCL.
Traps
- Using the series formula for parallel resistors.
- Forgetting that Thevenin resistance is found with sources killed: voltage sources shorted, current sources opened.
- Mixing mm and m in stress or elongation formulas.
- In AC circuits, using peak voltage where RMS is required.
- In CSE questions, confusing average and worst-case complexity.