NCEES Mechanical Engineering

Question 1

On the NCEES PE Mechanical exam, the first law of thermodynamics for a closed system states that:

Accepted Answer

Change in internal energy equals heat added minus work done by the system

Answer

Entropy always increases

Answer

Heat added equals work done minus change in internal energy

Answer

Work done equals heat added times efficiency

Question 2

In NCEES PE Mechanical problems, the Carnot efficiency of a heat engine operating between TH = 600 K and TL = 300 K is:

Accepted Answer

50%

Answer

25%

Answer

33%

Answer

75%

Question 3

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?

Accepted Answer

Reynolds number

Answer

Prandtl number

Answer

Nusselt number

Answer

Mach number

Question 4

For the NCEES PE Mechanical exam, Bernoulli's equation is valid when flow is:

Accepted Answer

Incompressible, inviscid, and steady along a streamline

Answer

Compressible, viscous, and unsteady

Answer

Turbulent and isothermal

Answer

Through a rotating impeller

Question 5

In NCEES Mechanical Engineering fundamentals, the stress-strain curve's elastic region is characterized by:

Accepted Answer

A linear relationship described by Hooke's Law (σ = Eε)

Answer

Permanent deformation proportional to load

Answer

Necking and fracture

Answer

Strain hardening behavior

Question 6

On the NCEES PE Mechanical exam, the heat transfer rate through a flat wall by conduction (Fourier's Law) is:

Accepted Answer

Q = kA(T₁ − T₂)/L

Answer

Q = hA(T₁ − T₂)

Answer

Q = εσAT⁴

Answer

Q = mCpΔT