FE Knowledge Flashcards
7 cards from real Fundamentals of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 FE Knowledge flashcards as text
A 3 Ω and 6 Ω resistor are connected in parallel. What is the equivalent resistance?
Answer: 2 Ω
1/R_eq = 1/3 + 1/6 = 2/6 + 1/6 = 3/6, so R_eq = 2 Ω.
Which of the following dimensionless numbers represents the ratio of inertial forces to viscous forces in fluid flow?
Answer: Reynolds number
The Reynolds number Re = ρVL/μ is the ratio of inertial to viscous forces and determines flow regime.
What is the determinant of the matrix [[2,1],[3,4]]?
Answer: 5
det = (2)(4) − (1)(3) = 8 − 3 = 5.
During an isentropic process, which pair of properties remains constant?
Answer: Entropy (constant) with no heat transfer
An isentropic process is both adiabatic (no heat transfer) and reversible, so entropy remains constant.
A 10 kg block rests on a 30° incline with μ_s = 0.4. What is the maximum static friction force available (g = 9.81 m/s²)?
Answer: 34.0 N
Normal force N = mg cos30° = 10×9.81×0.866 = 84.9 N; f_s_max = μ_s × N = 0.4×84.9 ≈ 34.0 N.
The continuity equation in fluid mechanics is an expression of:
Answer: Conservation of mass
The continuity equation ∂ρ/∂t + ∇·(ρV) = 0 enforces conservation of mass in fluid flow.
If a project has a benefit-to-cost ratio (BCR) of 1.35, which statement is correct?
Answer: The project is economically justified because benefits exceed costs
A BCR > 1.0 indicates the present worth of benefits exceeds costs, making the project economically justified.