Why do some gas furnaces not require an electrical power supply?
What will be an ideal response?
The voltage to operate the system comes from a thermopile. The thermopile's voltage is enough to operate the gas valve.
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Which of the following insulations is combustible?
A) Vermiculite B) Extruded polystyrene (XPS) board C) Fiberglass D) Foamed concrete E) Perlite board
Factors determining the amount of wind erosion include all of the following EXCEPT ____
a. soil erodibility b. soil roughness c. soil water capacity d. climatic conditions e. length of field f. vegetative cover
One way of reducing the impact of housing on the environment is to ____ the housing density in a development.
A. increase B. decrease C. maintain D. sustain
Technician A says that coolant from the upper radiator hose should be cooler than coolant from the lower radiator hose. Technician B says that many front wheel drive vehicles use a cooling fan mounted to the engines water pump shaft. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician