Mechanical Engineering PE Exam Flashcards
6 cards from real NCEES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mechanical Engineering PE Exam flashcards as text
On the NCEES PE Mechanical exam, what does 'fatigue limit' (endurance limit) represent for a steel component?
Answer: The stress amplitude below which a material can theoretically withstand infinite load cycles without failure
The endurance limit (Se) is the stress amplitude below which a ferrous material can endure an essentially unlimited number of loading cycles without fatigue failure.
In the NCEES PE Mechanical exam, what is the purpose of the 'Miner's rule' in fatigue analysis?
Answer: To linearly accumulate damage fractions from variable amplitude stress cycles
Miner's rule (cumulative damage theory) sums the ratios ni/Ni for each stress level, predicting fatigue failure when the sum reaches 1.0.
For the NCEES PE Mechanical exam, which type of bearing is best suited for handling both radial and axial (thrust) loads simultaneously?
Answer: Deep-groove ball bearing
Deep-groove ball bearings can carry both radial and moderate thrust loads simultaneously due to their geometry, making them the most versatile and widely used bearing type.
On the NCEES PE Mechanical exam, what does the AGMA bending stress equation for gear teeth primarily check?
Answer: Root bending fatigue strength of the gear tooth
The AGMA bending equation calculates the tensile bending stress at the root of the gear tooth and compares it to the material's allowable bending stress to prevent tooth breakage.
In the NCEES PE Mechanical exam, what is 'thermal resistance' in heat transfer analysis?
Answer: An analogy to electrical resistance representing the opposition to heat flow
Thermal resistance (R = L/kA for conduction, 1/hA for convection) allows complex heat transfer problems to be solved using electrical circuit analogies.
For the NCEES PE Mechanical exam, which fluid property governs the Bernoulli equation's applicability?
Answer: The fluid must be inviscid (frictionless) and incompressible along a streamline
Bernoulli's equation applies to steady, inviscid, incompressible flow along a streamline, where energy losses due to viscosity and density changes are negligible.
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