Job evaluation provides the pay level for the job.
No, it only provides an evaluation result which positions the job within a grading structure, which in turn forms the basis for a pay structure.
Re-evaluating a job at a higher grade will result in an increased salary.
This will depend on the policy within the organisation, as well as the position in the pay structure.
Increase in workload results in salary increase
Job evaluation measures the nature and complexity of the job and not the volumes of work performed. Increased workload should not automatically result in a re-evaluation
Job evaluation is an exact science.
There is always an element of judgement involved in the process, based on how the users interpret the questions.