Fig. 4.21 8. Find the minimum size of a hole that can be punched in a 20 mm thick mild steel plate having an ultimale shear strength of 300 N/mm². The maximum permissible compressive stress in the punch material is 1200 N/mm².

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