If you dont know that you should probably not take the test yet. Baffles are used in exchangers they are rings that hold the tubes together. The baffles have holes in them that the tubes pass through to hold them together the baffles also hold your bundle centered in the shell.
No
yes
can i view a copy of entire nccer boilermaker test?
yes.
Yes
Yes there are
It varies. It depends on where you take the test.
Slope of a road
Online Curse!
Yes
Bolt up
No. NCCER does not offer sample tests for any craft.