الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This thesis reviews and analyze the frequent and auth-oritative, ngineering economic , factors which must be onsidered when f proper main propulsion machinery is to be carried out •The esearch work starts by ’ed the state of theart in terms of arrangements and power outout, fuel and lub-ricants, ma.intenance and repair,. as well El- reliability for each conventional type of propulsion machinry. The importance of establishing meaningfull performance measures for comparing the relative erits of alternate power plants has been consi¬dered • Performance data for the major parameters which would facilitate such meaningfull comparison has also been provided.There are many factors that have influenced the choice of suitable machinery as prime mover. The engineering facto~sought to omprise both the power and service requirements, as well as, the productivety of transport has been death with separately in cha.pter, (3) •Fu~herrnore,• the economical factors; whid1 has been trea-ted sufficiently in hapter(4); has a great deal of influence on the selection procedure. These factors comprise the acqui-sition costs besids the operating costs, consisting of the fuel, lubricating oil, maintenance and repair costs etc It should be pointed out that in this research work a three main categories in classifying the Arab tankers haS•••been.