What advantage is there to maintaining a negative pressure on the heat exchanger?
A) Combustion air can only be drawn into the oil burner if a negative pressure is maintained
B) Safety, to insure combustion products do not leak out into the air stream
C) The vent will not work unless the heat exchanger is at a negative pressure
D) The negative pressure helps draw in return air from the house, increasing efficiency
B
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Measuring intake manifold ____________________ is a way of determining the condition of an engine.
Fill in the blank(s) with the appropriate word(s).
Too much traffic on lawns causes _____________ of the soil
A) aeration B) compaction C) drainage D) an infestation
The type of solder that should be used for electrical work is ________
A) Rosin core B) 60/40 with no flux C) 50/50 with acid paste flux D) Acid core
The best way to overcome language, culture, and literacy barriers is to provide safety training programs offering: