Here are some solutions to part of the microeconomics PhD comprehensive exams.
I was able to check solutions for the part made by professor Arthur Robson only, so solutions to the other parts are not available.
micro-comp-may-2011
26-05-2011-micro
micro-comp-july-2011
22-07-2011-micro
micro-comp-july-2012
24-07-2012-micro
micro-comp-may-2014
23-05-2014-micro
micro-comp-july-2014
16-07-2014-micro