Writing PhD proposals is bit tricky, you will write a proposal so that to convince your guide and University selection committee to secure PhD position.
So its quite important to have well structure PhD proposal with clear objectives , I would say objectives are the most important part of the proposal. Objectives will explain what exactly you want to achieve at the end of the research and if objectives are vague, not clear or not quite worthy of research then there will be more chances of your phD proposal report being rejected. It is essential that objectives must have the measurable outcomes.  In the pHD proposal there are as such no number of fixed objectives you should have , but the objectives should be sufficient enough to meet the measurable outcomes of the research.

The PhD Proposal writing guide:

 

All good thesis proposals contain two important parts : a clearly-defined thesis, and a specific plan for demonstrating that thesis.

It is always a good idea to read the university research background and study the background of your supervisor before choosing him/her as this will give you an idea
of whether this is suitable guide for your proposal and what things you should include in your proposal to convince them.

It is good to an abstract or introduction in the pHD proposal that gives reader an initial idea what will the research is about.

Having research questions will help you go into the right direction as keeping these questions in mind will save your lots of time researching on the stuff which is not related to your research.

It is important in PhD proposals that the topics should be new , the area you are starting to research should be new and worthy of research. You need to write about what exactly you are contributing new to your existing field or existing literature available,your research should be new and worthy of conducting research on it.

A good doctorate proposal should have a good plan and a good plan contains a proposed schedule–a list of milestones and anticipated dates of their completion. It is essential that a plan should contain the possibility of failure. Real research is inherently unpredictable, and failure is always a possibility. If failure is not possible, it must not be research. The proposal needs to create the impression that failure is unlikely. A good plan also provides the criteria for recognizing the completion of a milestone, e.g., submitted for publication, accepted for publication, survey completed, chapter written.

In the samples provided ,please see how the author has followed the structure and keep the flow of information quite uniformly.

Finally remember the research proposals longer than fifteen pages are unlikely to be read in full.