Answer the following questions for a simple gear pair of two spur gears (hob cut) with pitch diameters of 2.5" and 5". use a pressure angle of 25o and coarse pitch. the largest standard tooth size, in terms of diametral pitch, is answer 6 correct teeth/inch. the minimum number of teeth for the pinion is answer 15 correct teeth. the minimum number of teeth for the gear is answer 30 correct teeth.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater