PRC Mechanical Engineer case studies
PRC Mechanical Engineer · Put your knowledge to work in context.
The Mechanical Engineer Licensure Examination is the Philippine board examination for entry into the mechanical engineering profession, administered by the Professional Regulation Commission (PRC) through the Professional Regulatory Board of Mechanical Engineering. It is intended for graduates of mechanical engineering programs who need a license before taking responsible charge of mechanical design, installation, operation and power plant work, and before signing and sealing mechanical plans. The PRC Mechanical Engineer case studies are 5 cases and about 3,150 words.
1Conveyor Gearbox Output Shaft: Keyseat Fatigue Check
A 15 kW, 360 rpm motor drives a single-reduction gearbox whose output shaft carries a 200 mm pitch-diameter spur gear with a 20° pressure angle. The shaft is 45 mm diameter at the bearing seats, simply supported over a 500 mm span, with the gear at midspan and located by a keyseat cut with a standard end mill.
664 words, about 3 min2Cutting Speed Selection on a Late Order
A job shop must turn 400 pieces of 1045 cold-drawn bar, Ø80 mm × 300 mm long, in a single pass at 2.5 mm depth of cut and 0.3 mm/rev on a CNC lathe. Taylor constants for the coated-carbide insert at this feed are n = 0.25 and C = 250 (V in m/min, T in min).
566 words, about 3 min3Cooling-Water Pump Cavitation After 18 Months
A cooling-water pump draws 120 m³/h from an open sump through 8 m of DN150 (150 mm ID) suction pipe with friction factor 0.02 and fittings equivalent to K = 6.5 velocity heads. The pump centreline sits 0.8 m above the sump water level.
668 words, about 3 min4Pump Set Redundancy: Two, Three or Four Pumps
A process plant needs a cooling-water pumping set that delivers full flow with two pumps running. A RAM study gives each identical pump a one-year mission reliability of 0.95, with failures assumed independent.
648 words, about 3 min5Rewind or Replace a 200 kW Pump Motor
A plant's 200 kW raw-water pump runs 6 000 h/yr at an average load of 75% of rated output. Two options are on the table.
604 words, about 3 min