Fundamentals of Engineering Flashcards
7 cards from real EI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Fundamentals of Engineering flashcards as text
What is the moment of inertia of a solid circular cross-section of diameter d about its centroidal axis?
Answer: πd⁴/64
The area moment of inertia of a solid circle is I = πd⁴/64.
In engineering economics, a project has a first cost of $50,000 and annual net benefits of $12,000 for 6 years at 8% interest. The benefit-cost ratio is closest to:
Answer: 1.14
PW of benefits = 12,000 × (P/A, 8%, 6) = 12,000 × 4.623 = $55,476; BCR = 55,476/50,000 ≈ 1.11, closest to 1.14.
A block weighing 500 N rests on a surface with a coefficient of static friction of 0.4. What minimum horizontal force is required to start moving it?
Answer: 200 N
F = μₛN = 0.4 × 500 = 200 N.
Which differential equation correctly models simple harmonic motion?
Answer: d²x/dt² + ω²x = 0
Simple harmonic motion is described by d²x/dt² + ω²x = 0, whose solution is sinusoidal.
The FIRST law of thermodynamics for a closed system in differential form is:
Answer: dU = δQ − δW
The first law for a closed system is dU = δQ − δW, where W is work done BY the system.
In fluid mechanics, the Reynolds number is defined as:
Answer: ρVL/μ
Reynolds number Re = ρVL/μ, representing the ratio of inertial to viscous forces.
The derivative of ln(x) with respect to x is:
Answer: 1/x
d/dx[ln(x)] = 1/x for x > 0.