HKIE Professional Assessment - Electronics Discipline case studies
HKIE Professional Assessment - Electronics Discipline · Put your knowledge to work in context.
The HKIE Professional Assessment - Electronics Discipline is the route by which an engineer in Hong Kong demonstrates the competence expected of a professional member of the Electronics Division of The Hong Kong Institution of Engineers. It is aimed at graduate engineers working in electronics-related practice - circuit and system design, embedded and communications work, project and contract management, and the statutory environment in which electronics engineering in Hong Kong is carried out - who are preparing to be assessed on their ability to apply that knowledge responsibly at a professional level. The HKIE Professional Assessment - Electronics Discipline case studies are 5 cases and about 3,041 words.
1Field Failure of 24 V DIN-Rail Power Supplies in Hot Enclosures
A fleet of 500 DIN-rail 24 V, 5 A switch-mode power supplies is installed in car-park ventilation control panels across Hong Kong. After nine months, 38 units (7.6%) have failed: the output sags to about 12 V under load, the unit hiccups, then the internal fuse opens.
681 words, about 3 min248 V PoE Buck Converter Overheats and Fails EMC
A 48 V Power-over-Ethernet input, 5 V/3 A output buck converter is built on a 100 mm × 80 mm four-layer PCB inside a sealed IP54 enclosure. The converter switches at 400 kHz, uses a 10 µH shielded inductor and a 25 mΩ MOSFET.
658 words, about 3 min3RS-485 Multidrop Network with CRC Errors and Common-Mode Surges
An RS-485 network links 32 variable-frequency drives and energy meters in a Hong Kong factory. The cable is 200 m of shielded twisted pair, daisy-chained except for one 15 m spur to a drive.
621 words, about 3 min4Extension of Time, Certification Pressure and a Supplier Trip
A consultant is the engineer's representative on a HKD 8.2 million lighting-control replacement in a government building. The contract programme is 26 weeks.
591 words, about 3 min5New 32 A Circuit in an Ageing Commercial Switchboard
A restaurant renovation in a 30-year-old Hong Kong commercial building adds a 32 A single-phase circuit for a 7 kW combi oven. The existing 400 A three-phase, four-wire switchboard has a spare 63 A MCCB way.
490 words, about 2 min