Consider an n-type semiconductor at t 300 k in thermal equilibrium (no current). assume that the donor concentration varies as nd(x) nd0exl over the range 0 x l where nd0 1016 cm3 and l 10 m. (a) determine the electric fi eld as a function of x for 0 x l. (b) calculate the potential difference between x 0 and x l (with the potential at x 0 being positive with respect to that at x

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false