?What are the two major safety problems when hydrogen is used as a fuel gas?
What will be an ideal response?
?Two major safety problems exist when hydrogen is used as a fuel gas. First, hydrogen has no smell, which makes it difficult to detect leaks. Second, the molecule is extremely small so that it leaks easily. When using hydrogen, an active leak-checking schedule must be followed to find small problems before they develop into disasters. It is possible for a leak to be on fire and not be noticed, because the hydrogen flame is almost invisible.
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Discuss the differences between a rigid-frame building and a woodframe building
What will be an ideal response?
If parking a tractor on a grade, the tractor should be parked _____
a. at a 25-degree angle to the grade or slope b. at a 45-degree angle to the grade or slope c. at a right angle to the grade or slope d. parallel to the grade or slope
The grid is ___________
a. All of the electrical power distribution systems in the United States and North America. b. The electrical connection between the solar photovoltaic system generator and the solar photovoltaic systemtower c. The electrical connection that exists only between solar photovoltaic panels in a solar farm.
In a cascade system, if one refrigeration circuit (stage) develops a large refrigerant leak, ____.
A. the evaporator superheat of all the other circuits (stages) will increase B. the condenser subcooling of all the other circuits (stages) will increase C. none of the circuits will operate correctly D. both b and c