For a si/si1-xgex /si hetero-junction bipolar transistor, x=0.1 in the base region and x=0 in the emitter and collector regions. bandgap of the base region is 12% smaller than that of si. if the base current is due to emitter injection efficiency only, calculate improvement in the common emitter current gain at 10 oc over 120 o c.

Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.

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

Wiy doeres rere okhn a pump whon working betwon the same pressure range?