The backup wall in a brick veneer wall assembly consists of
A) a CMU wall.
B) a wood or steel stud wall.
C) a reinforced-concrete wall.
D) all of the above.
E) B and C only.
D) all of the above.
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The ____ permits the use of intrinsically safe systems in areas that contain hazardous vapors.
a. NEMA b. NEC c. IEEE d. UL
What flow type occurs when two streams move perpendicular to each other?
A. Cross flow B. Hybrid flow C. Parallel flow D. Laminar flow
Answer the following statement(s) true (T) or false (F)
1. Today, one would be hard-pressed to find some electronic device that doesn’t have semiconductor components. 2. Solid-state devices such as the PN junction diode and the transistor have replaced vacuum tubes in very high- power radio and TV transmitters. 3. The PN junction diode is composed of P-type material such as boron and N-type material such as arsenic that are chemically combined. The boron atoms have an overall positive charge. The arsenic atoms of N-type material have an overall negative charge. 4. If a diode reads infinite in both the forward and reverse bias conditions, it is bad (open) and must be replaced. 5. You can replace a bad diode with any diode in your parts bin.
President Roosevelt's promise to the Soviets to open a second front in Western Europe by the end of 1942
A. was fulfilled by the invasion of North Africa. B. was made to deceive Stalin and encourage him to slow his army's movement into Eastern Europe. C. was strongly supported by Churchill and British military leaders. D. proved utterly impossible to keep. E. represented the key goal to which all early American military efforts were directed.