Figure Q1(a) shows two steel plates connected by three steel bolts having a failure shear stress of 280 MPa with a factor of safety of 1.6. If the diameter of bolts used is 15
mm and the force of 80 kN is applied to the steel plates, justify whether the diameter of
bolts provided is enough to safely carry the load. Find the normal stress in the steel
plate if the cross-sectional area of the plate is 1600 mm². (CO1-P01)(C2)
(15 marks)
80 KN
→ 80 KN
Figure Q1(a)

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