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)

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An angle grinder is used to grind _____

a. soft, porous materials b. imperfections in wood c. hard, heavy materials d. nonmetals only

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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)

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Which of the following best describes the role of voltage in an electrical circuit?

A. Current. B. Pressure. C. Polarity. D. Potential.

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