A typical engineering PhD dissertation can range in length from 100 to 300 pages, with an average of around 200 pages. The exact length and content may vary depending on the institution, department, and program requirements. Generally, a strong engineering dissertation includes a literature review (10-20%), original research (50-70%), data analysis (10-20%), and detailed explanations of methodologies and results (10-20%). It's common to include visual aids such as figures, tables, and graphs to illustrate key points. In terms of word count, a general guideline is: introduction (approx. 5-10 pages), literature review (approx. 15-30 pages), methodology (approx. 10-20 pages), results (approx. 20-40 pages), discussion (approx. 15-30 pages), and conclusion (approx. 5-10 pages). However, this is only a rough estimate, and the actual length of an engineering PhD dissertation can vary significantly.