Fundamentals of Engineering FE Knowledge 4

Question 1

A 3 Ω and 6 Ω resistor are connected in parallel. What is the equivalent resistance?

Accepted Answer

2 Ω

Answer

1/R_eq = 1/3 + 1/6 = 2/6 + 1/6 = 3/6, so R_eq = 2 Ω.

Question 2

Which of the following dimensionless numbers represents the ratio of inertial forces to viscous forces in fluid flow?

Accepted Answer

Reynolds number

Answer

The Reynolds number Re = ρVL/μ is the ratio of inertial to viscous forces and determines flow regime.

Question 3

What is the determinant of the matrix [[2,1],[3,4]]?

Accepted Answer

5

Answer

det = (2)(4) − (1)(3) = 8 − 3 = 5.

Question 4

During an isentropic process, which pair of properties remains constant?

Accepted Answer

Entropy (constant) with no heat transfer

Answer

An isentropic process is both adiabatic (no heat transfer) and reversible, so entropy remains constant.

Question 5

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)?

Accepted Answer

34.0 N

Answer

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.

Fundamentals of Engineering Practice Test