A cast steel electro magnet has an air gap length of 3mm and an iron path of length 40cm. Find the number of ampere turns necessary to produce a flux density of 0.7wb/m^2 in the air gap. Neglect leakage. Assume ampere turns required for air gap to be 70% of the total ampere turn.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

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