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1. Question 1 points Fuel Pump fail to prime when Suction inlet vacuum is greater than _______ of vacuum 20 inches 30 inches 15 inches 25 inches ✔✔15 inches Which of the following is used to ignite the fuel oil in the heating system: Step down transformer Step up transformer ✔✔Step up transformer Air enters the heating system in following order: from combustion chamber, to turbulator, to draft tube
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20 inches 30 inches 15 inches 25 inches ✔✔15 inches
Which of the following is used to ignite the fuel oil in the heating system: Step down transformer Step up transformer ✔✔Step up transformer
Air enters the heating system in following order: from combustion chamber, to turbulator, to draft tube
from draft tube, to turbulator, to combustion chamber
combustion chamberfrom turbulator, to turbulator, to combustion chamber^ ✔✔from draft tube, to turbulator, to Malfunctions in the heating system cause primary safety control to _______ electrical resistanceacross the cell until the burner is automatically shut off.
reduce increase ✔✔increase
A ______ carbon dioxide content is usually caused by insufficient draft or an overfired burner low high ✔✔high
A _______ stack thermometer is generally used to measure the flue gas temperature in oilheating system:
Rotary burners operate with high-pressure gravity False True ✔✔False
Which of the following oil burner has relatively high operating cost vaporizing oil burner pot-type oil burner Gun type oil burner ✔✔Gun type oil burner
If the oil tank is located above the burner, and the oil is supplied by gravity flow, the vacuumgauge must show a reading of _______:
zero positive value negative value ✔✔zero
In two stage oil pump the _______ stage draws completely air-free oil: both first and secondsecond first ✔✔second
The spray angle of oil from burner nozzle will generally range from ______: 60° to 90°.30° to 90° 45° to 90° 70° to 90° ✔✔30° to 90°
Fuel pump is located on the left side of the oil burner True False ✔✔True
