How would the primary control need to differ to accommodate power venting?
What will be an ideal response?
Power venting systems require that the furnace primary control allows for a delayed burner firing at startup. This allows the vent blower to come on and produce a draft before the burner firing sequence begins. The blower must also continue to run for a period of time after the burner shuts down to insure venting of all the combustion gases.
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Modern agriculture could also be called:
a. industrialized agriculture b. conventional agriculture c. high-input agriculture d. All of the above are correct.
Common and halo blight affect which crop species?
a. corn c. sugar beets b. small grains d. beans
Are valves in a one-pipe system used for throttling steam to the unit? Why or why not?
What will be an ideal response?
600-V, dc shunt motor has armature and field resistance of 1.5 ? and 600 ?, respectively. When the motor runs unloaded, the line current is 3 A, and the speed is 1000 rpm. Calculate the developed torque at a full load armature current of 50 A.
What will be an ideal response?