Which category of appliances are nonpositive vent static pressure with a vent gas temperature that avoids excessive condensate production in the vent?
a. Category I
b. Category II
c. Category III
d. Category IV
ANSWER: a
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If the overall mixture is 20% by mole R-245fa, will the mixture exist in one phase or multiple phases in equilibrium at 220 K and 0.1 bar according to the model? If the mixture does exist in multiple phases, what is the composition of the equilibrium phases?
Consider a model that predicts the behavior of the R-245fa (1) + isopentane (2) system at two pressures shown in the figure.
A. 1 liquid phase
B. 1 vapor phase
C. 1 liquid phase (x1 = 0.03) and 1 vapor phase (y1 = 0.37)
D. 2 liquid phases (x1? = 0.22; x1? = 0.92) and 1 vapor phase (y1 = 0.64)
E. 2 liquid phases (x1? = 0.13; x1? = 0.95)
An angle grinder is used to grind _____
a. soft, porous materials b. imperfections in wood c. hard, heavy materials d. nonmetals only
A higher percentage of the U.S. sheep flock is used for wool production than meat production.
Answer the following statement true (T) or false (F)
Which of the following best describes the role of voltage in an electrical circuit?
A. Current. B. Pressure. C. Polarity. D. Potential.