FREE FE Knowledge Questions and Answers

Question 1

If the material was under 0.09 strain and the following information is known, find the modulus of elasticity of the composite material:

Accepted Answer

350,000 psi

Answer

The closest option is 350,000 psi. Therefore, the modulus of elasticity of the composite material is approximately 350,000psi.

Question 2

The hydraulic conductivity of a soil is tested using a sample, which is a cylindrical container 25 cm in length and 10 cm in diameter on a circular cross section.

What is the soil's hydraulic conductivity when the sample is exposed to a 50 cm head and an 8 cm3/min flow rate is measured through it?

Accepted Answer

0.05 cm/min

Answer

Among the provided options:

The closest option is 0.05

cm/min
0.05cm/min. Therefore, the hydraulic conductivity of the soil is approximately
0.05

cm/min
0.05cm/min.

Question 3

A compressive load is supported by a short post made of an aluminum hollow circular tube with inner and outer diameters of d1 = 3.6 in and d2 = 5.0 in, respectively.

What is the strain on the 40-inch post whose length has been shortened by 0.044 inches as a result of the load?

Accepted Answer

0.0011

Question 4

A trucker makes an attempt to stop his vehicle. For the first 20 meters, the velocity decreases consistently from 12 m/s to 8 m/s. Assuming the truck keeps descending at the same pace, how far did it go in total before coming to a stop?

Accepted Answer

20m

Answer

To find the total distance traveled by the truck before coming to rest, we can use the kinematic equation for uniformly decelerated motion.
The negative sign indicates the direction of motion. The total distance traveled by the truck before coming to rest is 20 meters.

Question 5

A cylindrical container with a length of thirty centimeters and a circular cross section with a diameter of fifteen centimeters is used as the sample for the test to measure the hydraulic conductivity of a soil.

What is the soil's hydraulic conductivity when a 60 cm head is applied to the sample and a 12 cm3/min flow rate is recorded through it?

Accepted Answer

0.05 cm/min

Answer

The hydraulic conductivity (k) is determined using Darcy's Law, which states Q = k * A * (h/L), where Q is the flow rate, A is the cross-sectional area, h is the hydraulic head, and L is the sample length. First, calculate the cross-sectional area A = π * (diameter/2)². Then, rearrange the formula to solve for k: k = Q / (A * (h/L)). Plugging in the given values (Q=12 cm³/min, A=π*(15/2)² cm², h=60 cm, L=30 cm) yields a hydraulic conductivity of 0.05 cm/min.

Fundamentals of Engineering Practice Test

Fundamentals of Engineering Practice Test

FREE FE Knowledge Questions and Answers