a boiler delivers 5400kg of steam per hour at a pressure of 750KN/m^2 and with a dryness fraction of 0.98.The feedwater of the boiler is at a temoerature of 41.5 °c . The coal used for firing the boiler haas a calorific value of 31000KJ/kg and is used at the rate of 670Kg/hr. Determine the thermal efficiency of the boiler and the equivalent evaporation F and A 100 °c .​

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

The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?