An npn silicon transistor is biased in the inverse-active mode with VBE 3 V and VBC 0.6 V. The doping concentrations are NE 1018 cm3 , NB 1017 cm3 , and NC 1016 cm3 . Other parameters are xB 1 m, E0 B0 C0 2 107 s, DE 10 cm2 /s, DB 20 cm2 /s, DC 15 cm2 /s, and A 103 cm2 . (a) Calculate and plot the minority carrier distribution in the device. (b) Calculate the collector and emitter currents. (Neglect geometry factors and assume the recombination factor is unity.)

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

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?