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Question:
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Which of the fuel pumps are used with underground fuel tank applications:
Two stage fuel pump
Fuel Pump fail to prime when Suction inlet vacuum is greater than _______ of vacuum
15 inches
Too much _____ causes the flame to lift off the burner ports:
primary air
Which of the fuel oil gives more heat per gallon used.
No. 2
The efficiency or coefficient of performance (COP) of ground-source heat pumps is significantly ______ than that of air-source heat pumps:
higher
When there is a decrease in the primary air, which of the following is correct:
Increase in efficiency
Gross stack temperature will be in the range of ______:
500°F to 550°F
Delayed ignition is mainly traced to a problem with which of the following:
Electrodes
A draft hood will also control backdrafts that tend to extinguish the gas burner flame and the amount of excess air.
True
In ____ boilers, hot combustion gases pass through tubes submerged in water:
fire tube
Which of the following heating systems normally offer the most cost effective way to heat large buildings:
Gas fired
Which of the following are both used to service a fuel unit:
vacuum gauge and pressure gauge
Which of the following oil burner has relatively high operating cost
Gun type oil burner
Natural gas has a heating value of approximately _______ Btu per cubic foot:
1000
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