Hard Mechanical Engineering Challenge Quiz
A set of nine rigorous multiple-choice items probing advanced concepts in stress, heat, fluid flow, and design.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which failure theory predicts yielding of a ductile material under multiaxial loading by comparing the octahedral shear stress to the material's yield shear stress?
- 2
In a reversible Carnot cycle operating between 500 K and 300 K, what is the theoretical maximum efficiency?
- 3
A long cylindrical rod of diameter 0.02 m and thermal conductivity 150 W/m·K is maintained at 400 K at one end while the other end is insulated. If the rod length is 2 m and the heat flux is steady, what is the temperature at the insulated end?
- 4
For incompressible, steady flow in a horizontal pipe that narrows from 0.1 m diameter to 0.05 m diameter, how does the fluid velocity change assuming mass conservation?
- 5
Which gear tooth profile provides the smoothest transmission with constant angular velocity ratio?
- 6
What is the primary mechanism of creep in metals at temperatures above 0.5 Tm (absolute)?
- 7
A 1500 kg car traveling at 20 m/s brakes to a stop in 5 seconds. What is the average braking force?
- 8
In a second-order system with damping ratio ζ = 0.707, what is the percent overshoot approximately?
- 9
Which additive manufacturing process uses a laser to sinter powdered metal layer by layer?
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