Mechanical Engineers study how the forces of the world interact with objects, which a focus on movement,  and work with those forces to design and create a product.

This type of engineering is broad, and mechanical engineers are employed in many industries. One industry is vehicle design and manufacturing, from toy cars to space shuttles. They also work with electronics, robotics, automated machinery, and mechanical engineering includes fields like textile engineering and waste management. 

Mechanical Engineering jobs are usually highly specialized. For example, many engineers will work together to build something like a plane, but there will be individual teams who focus on the engines, the controls, and the interior respectively.

Engineers work with physical materials in the real world and with ideas on paper as well as computer-assisted design programs.

The invention of many important historical machines, such as the steam engine, is what we would call mechanical engineering today.

The average salary for a mechanical engineer is around $88,430 per year in the US

Entry-level mechanical engineering jobs typically require a bachelor’s degree.

An architectural engineer designs buildings using science and technology. They do things like find sustainable materials and find green energy sources. Their goal is to increase efficiency, and decrease costs. These engineers also have the opportunity to act as consultants to find employment with companies who specialize in specific types of construction.
Project Example: 

A few examples of possible projects by architectural engineers would be airports, stadiums, towers, hotels, cinema centers etc. 

Education Needed: 

A bachelor's degree is necessary, a typical engineering degree program can last up to 5 years. In some cases a license is required, for this you need a bachelor's degree in an engineering field, about four years of work experience and to pass a final exam. 

Average Salary: 

For a civil engineer (architectural engineers are included in this) and average salary would be about $86,640 per year (a 2018 estimate.) 
Sources: 

https://www.k-state.edu/careercenter/students/exploration/majorin/archengineering.html 

Bioengineers design biomedical equipment and devices. Like artificial organs, replacement body parts, and machines or programs for diagnosis. They apply principles of biology and engineering tools to create usable, tangible, economically-viable products.

What is an example of the types of projects this kind of engineer does?

A big example of a biomedical engineering project would be the invention of the MRI. An MRI or magnetic resonance image was invented 1977 by Raymond Damadian. It’s purpose is to take non-invasive photos inside the human body. Along with the expansion of that technology. Magnetic resonance imaging is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body

How much education is needed for this type of engineer?

Most bioengineers have a Bachelor's degree. Most bioengineers have a degree in bioengineering, biomedical sciences, or engineering. 

What’s an average salary for this type of engineering?
Average Salary

$91,410 per year 

$43.95 per hour

Source 1 Source 2

Industrial engineering is the engineering branch that includes finding out how something can be built or done better. Industrial engineers are concerned with reducing the cost of production, increasing productivity , improving the quality of goods and services, ensuring the safety and health of workers, protecting the environment and complying with government regulations. 

According to the Institute of Industrial Engineers, they "work to eliminate the waste of time, resources, materials , energy and other commodities."Industrial engineers, for instance, will work to streamline an operating room, shorten a roller-coaster line, make assembly lines smoother and more efficient, and speed up goods delivery.

In all stages of manufacturing and processing, industrial engineers are involved. From the ground up, they may build new installations, or they may be responsible for updating, extending or reconfiguring existing installations. They may be expected to design new equipment or write specifications to ensure it meets certain criteria for equipment purchased from outside vendors. Current facilities and equipment will also need to be reused, new processes designed and new tools and fixtures designed.

Industrial engineers must have a basic working knowledge of many engineering fields in order to maintain these standards and also be familiar with work processes, machinery, instruments and materials in order to design facilities, systems and equipment that comply with the requirements of cost , efficiency, safety and environmental protection.

Many positions in industrial engineering need at least an engineering bachelor's degree. Certification as a skilled engineer (PE) is also required by many employers , particularly those who provide engineering consulting services. For promotion to management, a master's degree is often necessary, and continuous education and training are required to keep up with developments in technology, materials, computer hardware and software, and government regulations. Furthermore, many industrial engineers are members of the Institute of Industrial Engineers.

The salary range for a newly graduated industrial engineer with a bachelor's degree as of October 2014 is $49,636 to $70,852. The range is $69,849 to $106,304 for a mid-level engineer with a master's degree and five to 10 years of experience, and the range is $89,587 to $131,045 for a senior engineer with a master's or doctorate and more than 15 years of experience. Many accomplished engineers with advanced degrees are promoted to leadership positions or start their own companies where they are promoted to management positions.

https://www.livescience.com/48250-industrial-engineering.html

https://mime.oregonstate.edu/what-do-industrial-engineers-do

https://www.bls.gov/ooh/architecture-and-engineering/industrial-engineers.htm