Mechanical Engineering 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 flashcards as text
On the NCEES PE Mechanical exam, the first law of thermodynamics for a closed system states that:
Answer: Change in internal energy equals heat added minus work done by the system
The first law states ΔU = Q – W: the change in internal energy equals heat added to the system minus work done by the system.
In NCEES PE Mechanical problems, the Carnot efficiency of a heat engine operating between TH = 600 K and TL = 300 K is:
Answer: 50%
Carnot efficiency = 1 − TL/TH = 1 − 300/600 = 0.50 = 50%.
Which dimensionless number is used to characterize the ratio of inertial forces to viscous forces in fluid flow, as assessed on the NCEES PE Mechanical exam?
Answer: Reynolds number
The Reynolds number Re = ρVD/μ represents the ratio of inertial to viscous forces and determines laminar vs. turbulent flow.
For the NCEES PE Mechanical exam, Bernoulli's equation is valid when flow is:
Answer: Incompressible, inviscid, and steady along a streamline
Bernoulli's equation applies to steady, incompressible, inviscid flow along a streamline.
In NCEES Mechanical Engineering fundamentals, the stress-strain curve's elastic region is characterized by:
Answer: A linear relationship described by Hooke's Law (σ = Eε)
In the elastic region, stress is proportional to strain via Hooke's Law: σ = Eε, and deformation is fully recoverable.
On the NCEES PE Mechanical exam, the heat transfer rate through a flat wall by conduction (Fourier's Law) is:
Answer: Q = kA(T₁ − T₂)/L
Fourier's Law of conduction: Q = kA(ΔT)/L, where k is thermal conductivity, A is area, and L is thickness.
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