List and describe two common types of gas valves.
What will be an ideal response?
combination gas valve (CGV): has the ability to control the flow of gas to both the pilot and the main gas line, which feeds gas to the burners; has a manual control and a built-in regulator that helps ensure that the pressure in the gas line to the furnace is within the desired range
two-stage gas valve: allows the system to operate at two different capacities; is found on two-stage gas furnaces; has two solenoid valves; when system calls for first stage heat, first solenoid is energized and system operates at 50% of total capacity; when system calls for full capacity, second solenoid is energized, allowing full gas flow through the valve
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What is the problem with using the internal reformation method of internal fuel supply for mobile applications?
What will be an ideal response?
The long-term persistence of a certain annual weed species is most likely due to:
a. extensive root system c. high seed production b. herbicide resistance d. tolerance to tillage
The part of the tire that is just under the tread of a radial tire is called the ________
A) Body (carcass) ply B) Bead C) Inner liner D) Belt
The Water Conservation Alliance of Southern Arizona estimates that the average household can save between 30,000 and 50,000 gallons of fresh water annually through the use of a ____ water system.
A. unified gray B. green C. whole house gray D. whole house green