The primary purpose of flashing is to _____
a. provide a base for the final finish
b. prevent the entry of water
c. provide protection from the elements
d. allow the use of the most cost-effective interior construction
b
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The NRC of a material lies between
A) 0 and 100. B) 1 and 10. C) 1 and 100. D) 0 and 10. E) none of the above.
Consider an AISI 4135 steel, in which all of the alloying elements have the mean or average value of their ranges.
(a) Determine its ideal critical diameter. (b) Determine the maximum diameter of a bar of this material that can be quenched, so as to obtain a 50 percent martensite?50 percent pearlite structure at its center when given a poor oil quench. (c) Make the same computation, but now assume that the bar is given a brine quench.
Answer the following statement(s) true (T) or false (F)
1. For a transformer of 600 volts or less, overcurrent protection is permitted. 2. When load taps are made in the tie circuit between transformers, the current-carrying capacity shall not be more than a stipulated percentage (200%) of the rated secondary current of the largest capacity transformer connected to the secondary tie. 3. Transformers may be operated in parallel and protected as a unit if their electrical characteristics are similar. 4. Transformers are required to have a disconnecting means located in sight from the transformer or in a remote location if the transformer is a class 2 or class 3 transformer. 5. The fire hazard potential of oil-insulated transformers is greater than that of askarel-insulated transformers.
Find the Fourier transform F(?) of f(t) shown below. Simplify F(?) as much as possible.
