What components are needed for a furnace to operate as a two stage furnace?
What will be an ideal response?
A two stage gas valve, two draft proving switches, a two speed induced draft fan, and a two stage thermostat.
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When different kinds of atoms combine chemically, they form materials called ____.
a. lattices b. molecule c. element d. compound
Shading greatly affects a PV array’s performance and as a general rule a PV array should be free of shade from ___________.
a. 6:00 am to 9:00 pm b. 10:00 am to 2:00 pm c. 9:00 am to 3:00 pm d. 5:00 am to 5:00 pm
The purpose of an evaporator in the refrigeration cycle is to _____
a. make sure no liquid gets into the compressor b. transfer heat from the air to the refrigerant c. transfer heat to the outdoors d. provide a pressure drop
Identify the order of the steps for the general lockout/tagout procedure:
____ Isolate and de-energize all sources of energy to the equipment. ____ Confirm isolation with maintenance and add maintenance tags. ____ Stop the equipment. ____ Tag the start/stop station. ____ Isolate the equipment (in other words, block, tag, and lock all process lines). ____ Centralize the isolation keys in an area with restricted access (for example, a lockout/tagout lockbox).