Combining dual secondaries of a toroidal transformer

Hi, I have a fairly good sized toroidal transformer that has two pairs
of primaries and two pairs of secondaries. The inputs are both 115V
and the outputs are both 33V, at 7A. I'd like to combine the outputs
in parallel, to give me 33V at 14A.

I have some questions.

1. The label on the tranny says PRI1 = blue/white PRI2 = black/grey
SEC1 = orange/yellow SEC2 = red/green

So...do I assume that to keep the secondaries in phase, that "orange"
should be tied to "red" and "yellow" should be tied to "green" --
since that's the way they are ordered, on the label? (i.e., do I
trust the label to indicate phasing?)

If I shouldn't trust the label, is there any sort of test I can do? I
don't have an oscilloscope, unfortunately.

2. What's the math equation to figure out what my ultimate DC voltage
will be after my 33VAC goes through full-wave rectification and
filtering?

It's been a long time since high school electric shop, as you can
tell...thanks for any help you can give me...

-Chris

.

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