On a psig gauge, "0" is actually ____.
A. 0 psia
B. 14.7 psia
C. 12 pisa
D. -14.7 psia
Answer: B
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La herramienta que se muestra en la figura se utiliza para:
a. cortar y biselar tuberías. b. roscar tuberías. c. girar la tubería en la máquina roscadora. d. escariar tuberías.
Which of the following would be the best instrument for accurately marking black elastomeric foam while fabricating a complicated insulation covering?
a. No. 2 pencil b. Knife c. Scribe point d. White grease pencil
A function of an angle is equal to the cofunction of the supplement of the angle.
Answer the following statement true (T) or false (F)
Answer the following statement(s) true (T) or false (F)
1. Conventional gas- and oil-fired boilers are currently used in the vast majority of residential and light commercial hydronic systems in North America. 2. The cast-iron sectional boiler is currently one of the most common boilers used in residential and light commercial buildings in North America. 3. If a cast-iron boiler is significantly oversized and experiences long off-times between firing cycles, much of the heat stored in the boiler’s thermal mass can be carried up the flue by air currents passing through the combustion chamber. 4. Many boilers currently used in North America were designed with the intent that flue gases would condense within the boiler. 5. Condensing boilers are designed with large heat exchanger surfaces capable of extracting more heat from the exhaust gases compared to the heat exchangers in conventional boilers.