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120 x 1.414 = 169.7 yes BUT that's peak to peak. When you rectifiy that you effectively divide it in half but then you have twice as many half cycles per unit time, so it comes out to a little less than the initial ac value.
That's why most dc motors are rated at 90 volts to be run from a 120 volt ac line.
That's why most dc motors are rated at 90 volts to be run from a 120 volt ac line.