PRC Mechanical Engineering Licensure Examination

In the Philippine Mechanical Engineer Licensure Examination (MELE), a candidate must obtain a general weighted average of at least what percentage, with no individual subject rating falling below a stated floor?

• A75% average, no rating below 60%
• B60% average, no rating below 40%
• C80% average, no rating below 70%
• D70% average, no rating below 50%

The MELE is divided into three board subjects. Which subject carries the 30% weighting?

• APower Plant Engineering
• BMathematics, Engineering Economics and Basic Engineering Sciences
• CMachine Design, Materials and Shop Practice
• DRefrigeration and Air Conditioning

A solid circular shaft transmits a torque T. If the shaft diameter is doubled while T is held constant, the maximum torsional shear stress on the surface becomes what fraction of the original stress?

• A1/8 of the original
• B1/2 of the original
• C1/4 of the original
• D1/16 of the original

In an ideal Rankine cycle, which process occurs in the boiler?

• AIsentropic expansion
• BIsentropic compression
• CConstant-pressure heat addition
• DConstant-pressure heat rejection

The coefficient of performance (COP) of a refrigerator operating on a reversed Carnot cycle between a cold reservoir at TL and a hot reservoir at TH is given by which expression?

• ATH / (TH - TL)
• B(TH - TL) / TL
• CTH / TL
• DTL / (TH - TL)

Under the Philippine Mechanical Engineering Code, a high-pressure boiler is one that furnishes steam at a gauge pressure in excess of which value?

• A15 psi (103.4 kPa)
• B100 psi (689 kPa)
• C30 psi (207 kPa)
• D5 psi (34.5 kPa)

For a belt drive, the ratio of tight-side tension T1 to slack-side tension T2 (neglecting centrifugal effects) is governed by which relationship, where f is the coefficient of friction and theta is the angle of wrap?

• AT1/T2 = f*theta
• BT1 - T2 = f*theta
• CT1/T2 = theta/f
• DT1/T2 = e^(f*theta)

A car accelerates uniformly from rest to 20 m/s in 8 seconds. What distance does it travel during this interval?

• A160 m
• B40 m
• C200 m
• D80 m

In a four-stroke spark-ignition engine, how many crankshaft revolutions are required to complete one full thermodynamic cycle in a single cylinder?

• A1 revolution
• B4 revolutions
• C0.5 revolution
• D2 revolutions

For a square key of width W and length L transmitting torque between a shaft and hub, which two failure modes are checked in standard key design?

• ATorsional shear and bending stress
• BShearing stress and compressive bearing stress
• CTensile stress and contact fatigue
• DHoop stress and radial pressure

A sum of P50,000 is invested at 8% interest compounded annually. Using compound interest, what is the approximate future worth after 5 years?

• AP70,000
• BP68,000
• CP80,000
• DP73,466

Two gears in mesh have 20 and 60 teeth respectively. If the 20-tooth pinion rotates at 1,800 rpm, the 60-tooth gear rotates at:

• A5,400 rpm
• B1,800 rpm
• C900 rpm
• D600 rpm

A centrifugal pump delivers 0.05 m^3/s of water against a total head of 30 m. Assuming water density 1,000 kg/m^3 and g = 9.81 m/s^2, what is the ideal (water) power required?

• A14.7 kW
• B1.47 kW
• C147 kW
• D29.4 kW

Which property of a material is most directly measured by a Rockwell or Brinell test?

• AToughness
• BDuctility
• CFatigue strength
• DHardness

Air flows steadily through a duct of decreasing cross-sectional area at subsonic speed. According to the continuity and energy principles for incompressible flow, the velocity:

• ADecreases and pressure increases
• BRemains constant
• CIncreases and pressure increases
• DIncreases and pressure decreases

The endurance limit in fatigue design refers to:

• AThe maximum static stress before yielding
• BThe stress at fracture in a single tensile pull
• CThe stress that causes immediate buckling
• DThe stress below which a material can endure infinite load cycles

In an air-standard Otto cycle, the thermal efficiency depends primarily on which parameter?

• AMean effective pressure
• BMass of fuel injected
• CExhaust gas temperature
• DCompression ratio

A simply supported beam of length L carries a concentrated load P at midspan. The maximum bending moment is:

• APL/8
• BPL/2
• CPL
• DPL/4

How does PRC's current Mechanical Engineering page identify the Philippine Society of Mechanical Engineers, Inc. (PSME)?

• AThe government licensing board itself
• BA private review center
• CAn international standards body
• DThe PRC-accredited professional organization (APO) for mechanical engineers

What is the change in internal energy of a closed system that absorbs 500 kJ of heat while doing 200 kJ of work on its surroundings?

• A700 kJ
• B-300 kJ
• C100 kJ
• D300 kJ

In refrigeration, one ton of refrigeration (1 TR) is defined as a rate of heat removal of approximately:

• A3.517 kW
• B1 kW
• C12 kW
• D35.17 kW

A column with both ends pinned has an effective length factor K equal to:

• A0.5
• B2.0
• C0.7
• D1.0