Explain what is Ad rank?
Ad rank is totally depends upon the quality score. As more as the quality score, the higher will be the ad rank. For this, you need to make sure that your landing page should be more relevant to your ad.
Ad ranking in Internet marketing is the position of a pay-per-click ad on a search engine results page All other things equal, the more relevant your keywords, ad text and landing pages, the higher your Quality Score, and the higher your ad ranking. Ranking yahoo, ad ranking system,google ad ranking,how are ads ranked adwords,how are ads ranked,keyword ranking ads,internet ad spending rankings.
AdRank in AdWords has historically been calculated based on your Max CPC and Quality Score. The preceding figure illustrates how competing ads on Google are ranked in descending order of Ad Rank. The advertiser that has the highest product of maximum CPC bid and Quality Score wins the coveted top ad spot.
source: http://searchengineland.com/new-adwords-ad-ranking-formula-what-does-it-mean-174946
A value that's used to determine your ad position (where ads are shown on a page) and whether your ads will show at all. Ad Rank is calculated using your bid amount, the components of Quality Score, and the expected impact of extensions and other ad formats.
Ad Rank determines your ad position - whereyour ad shows on the page in relation to other ads - and whether your ads are elegible to show at all.