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In the third edition of the PPI practice exam problem 21 states that the PNA for a bridge deck is 6.35" below top of concrete, in the solution, the author uses the full height of the slab for the compression area. Why is that done? Should 6.35" of the slab be used? Or better yet, shouldn't...

Yes, I'm sure of it. Take a look at Figure CC-1.14-1, page C-43 in the ACI 530. It shows that h>=2*Height. So k=2.1 isn't wrong it's just arbitrarily not right. 

I have a question about the solution to problem 601. About 1/2 way down the page, when calculating the effective height of the wall, a k factor of 2.1 is used. I looked in the masonry code as well as my Amrhein book and both say to use 2 for a fixed/free condition. Any insight as to why NCEES is...