How does nitrogen purging prevent the formation of oxides?
What will be an ideal response?
Oxides are formed by a chemical reaction between oxygen and a metal. If there is no oxygen, the oxides cannot form. The nitrogen replaces the air, eliminating the oxygen and preventing the formation of oxides.
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You are stoking a fire in a furnace, and leave the stoker inside the furnace for several minutes. The end of the stoker inside the furnace reaches a temperature of 300°C, while the other end of the stoker in the air is cooled sufficiently to maintain a temperature of 60°C. The length of the stoker between these two ends is 2.0 m. If the cross-sectional area of the stoker is 0.0010 m2, determine the rate of heat transfer that occurs if (a) the stoker is made of aluminum (? = 237 W/m-K), (b) iron (? = 80.2 W/m-K), and (c) granite (? = 2.79 W/m-K).
Given: T1 = 300°C; T2 = 60°C; ?x = 2.0 m; A = 0.0010 m2
Most port fuel injection systems use ____________________ injector at each cylinder.
Fill in the blank(s) with the appropriate word(s).
A plot of voltage vs. time for an alternating current yields a(n) ____________________.
Fill in the blank(s) with the appropriate word(s).
The number of careers available to those interested in agriculture number more than _____
a. 60 c. 500 b. 300 d. 150