During 1990â2003, Pakistan sustained its historical lead as the second-most urbanized nation in South Asia with city dwellers making up 36% of its population. Furthermore, 50% of Pakistanis now reside in towns of 5,000 people or more.
Submarine Propulsion Systems. During World War II, most American submarines were powered by diesel-electric systems. This was a departure from earlier submarine power systems, which were direct drive types, little changed from the earliest boats. In this direct-drive power system, the diesel engine is directly connected to the propeller shaft.
The type of propulsion system used on a ship depends on the vessel's requirement. The article describes the main types of propulsion systems that have been used on ships. Also find out the advantages and disadvantages of the electrical ship propulsion, which is extensively used on ships these days. slide 1 of 5.