FPSC Assistant Executive Engineer (Electrical) MES (BPS-17)

Posted on by Engr. Hamid Ali

If you’re preparing for the FPSC Assistant Executive Engineer (Electrical) MES (BPS-17) interview under the Ministry of Defence, this post is your ultimate guide. Here you’ll find authentic interview questions and answers shared by previously appeared candidates, covering both technical and general knowledge topics. From core electrical engineering concepts—like transmission systems, cable construction, and grounding—to theoretical problem-solving and current affairs, these insights will help you understand what the FPSC panel expects. Whether you’re a fresh graduate or an experienced engineer aiming for a government position, these real experiences will sharpen your preparation and boost your confidence for the MES AEE interview.

1. Introduce yourself

  • Keep it short and structured: Education → Experience/skills → Current role → Why you’re suitable for MES.

2. Why transmission is through high voltage?

  • Transmission at high voltage reduces current for the same power.
  • Lower current means reduced I²R losses.
  • Smaller conductor size → economical.

3. Construction of Power Cable

  • Main parts:
    • Conductor (copper/aluminum)
    • Insulation (XLPE, PVC)
    • Inner sheath
    • Armoring (steel tape/wire for mechanical strength)
    • Outer sheath (protection from environment)

4. Arcing Ground

  • Phenomenon in ungrounded or inadequately grounded systems.
  • During a single line-to-ground fault, repeated arc-extinction and restriking creates dangerous transient overvoltages.
  • Solved by solid grounding or Peterson coil grounding.

5. Lightning Arrestors

  • Protective device installed at substations and line ends.
  • Diverts surge voltage/current (from lightning or switching) safely to earth.
  • Prevents insulation breakdown of equipment.

6. Theoretically how can line losses be reduced in such a way that there are no more line losses?

  • Use superconductors (zero resistance at cryogenic temperatures).
  • Practically: losses can only be minimized (by high voltage transmission, larger conductor size, FACTS devices, better conductor materials).

7. How to improve efficiency of transmission line?

methods to improve (higher voltage levels, good conductor material, better sag/tension, reducing losses, proper maintenance).

read Comprehensive post on this topic by clicking here

8. Types of cable used in construction buildings?

PVC insulated, XLPE, armored, flexible cables, fire-resistant cables.

9. What is touch potential & step potential

safety concepts in earthing (voltage experienced by person due to fault current flow in soil)

read detailed post on this by clicking here

10. Surge Arrestors & where it uses

function & applications in power system (protect equipment from lightning/switching surges

11. Difference between Ckt breaker & isolator?

can break load/fault current, operates automatically; Isolator: only manual, no load/fault breaking

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