# FREE FE Knowledge Questions and Answers

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

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

#### It is what draws similar molecules to one another.

Cohesion refers to the attraction between like molecules. It is the force that holds molecules of the same substance together. In this context, the correct answer is cohesion because it accurately describes the attraction between like molecules. Adhesion, on the other hand, refers to the attraction between unlike molecules, reduction is the process of decreasing something, and conduction refers to the transfer of heat or electricity through a substance.

#### Which kind of bonding is dominated by electrostatic attraction?

Ionic bonding is a type of bonding in which electrostatic attraction is predominant. In ionic bonding, electrons are transferred from one atom to another, creating positively charged ions (cations) and negatively charged ions (anions). The electrostatic attraction between these oppositely charged ions holds them together, forming a strong bond. This type of bonding typically occurs between a metal and a nonmetal.

#### What is the term for elements in the periodic table numbered 58 through 71?

Elements numbered 58 to 71 in the periodic table are called lanthanons. Lanthanons are a group of elements that belong to the Lanthanide series. They are characterized by their similar properties and location in the periodic table. These elements are known for their high reactivity and are commonly used in various industrial and technological applications.

#### 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?

#### 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?

Among the provided options:

The closest option is 0.05

â€‰

cm/min

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

0.05

â€‰

cm/min

0.05cm/min.

#### 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?

Among the provided options. The closest option is

0.05

â€‰

cm/min

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

0.05

â€‰

cm/min

0.05cm/min.
"

#### What is the likelihood of rolling two dice and getting a sum of five?

When rolling two six-sided dice, each die can show a number from 1 to 6. The possible combinations of the two dice can be represented as a matrix, where each cell represents the outcome of one die (assuming fair six-sided dice):

To get a sum of 5, there are only four possible outcomes: (1, 4), (2, 3), (3, 2), and (4, 1). Out of the total 36 possible outcomes when rolling two dice (6 faces on the first die times 6 faces on the second die), the probability of rolling a sum of 5 is:

Probability

=

Number of favorable outcomes

Total number of outcomes

Probability=

Total number of outcomes

Number of favorable outcomes

â€‹

Probability

=

4

36

Probability=

36

4

â€‹

Simplify the fraction:

Probability

=

1

9

Probability=

9

1

â€‹

Therefore, the probability of rolling a sum of 5 with two dice is

1

9

9

1

#### 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?

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.

#### A compressive load is supported by a short post made of an aluminum hollow circular tube with inner and outer diameters of d1 = 5.6 in and d2 = 7.0 in, respectively.

What is the strain on the post? It is sixty inches long, and the load has caused it to shorten by 0.024 inches.

#### Which kind of cast iron is thought to be the most common, traditional, and all-purpose?

Gray iron is considered as the general purpose, oldest type, and widely used cast iron. It is known for its excellent castability, good machinability, and high wear resistance. Gray iron gets its name from the gray color of its fracture surface, which is caused by the presence of graphite flakes in its microstructure. This type of cast iron is commonly used in applications such as engine blocks, pipes, and automotive components.