What does the technician normally do when installing a gas vent on a rooftop packaged unit?
A) an approved double wall vent is piped away from the unit to the side of the roof
B) an approved single wall vent is piped at least 3 feet above the top of the unit
C) the manufacturer supplied hood is screwed onto the unit
D) a vent hood is only needed if the unit is installed inside
C
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Three resistors are connected in series across a 60 V source. If VR1 = 19 V and VR2 = 14.3 V, then what is the voltage drop across R3?
A) 14.3 V B) 19 V C) 45.7 V D) 26.7 V
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