A silicon wafer originally containing 1 P atom for every 10 million Si atoms is treated to produce a surface concentration of 400 P atoms per 10 million silicon atoms. Calculate the absolute value of the concentration gradient in atomic percent/cm and atoms/m^3/m. Silicon is diamond cubic with lattice parameter 5.4307 Angstroms.

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Have a greater impact on maintenance productivity than any other support group. (clo5) a)-the top management b)-inventory and purchasing c)-sub-contracting d)-cmms