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To avoid the danger of a furnace explosion during start-up, the
firing sequence allows for: - ANSWER-a pre-purge period
Which of the following would cause scale in a boiler? - ANSWER-calcium and magnesium
What is the pressure called in an idle boiler? - ANSWER-static pressure
What is the main purpose of an automatic FW (feedwater) regulator? - ANSWER-maintain boiler water level
What happens if a steam trap blows through? - ANSWER-steam vents from condensate tank
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A log book is needed in all plants that have over how much horsepower? - ANSWER-100 horsepower
In a plant that has only 100 horsepower, a licensed operator is required. - ANSWER-False
What is the heat content of one therm of natural gas? - ANSWER-100,000 Btu's
Carryover can lead to: - ANSWER-water hammer
What is the most common cause of problems in a hydronic system? - ANSWER-air
The metering combustion control system is sensitive to changes
in: - ANSWER-steam flow and pressure
If a boiler has been dry fired, what device did not work properly? - ANSWER-low water cut-off
What is the line voltage being used in the ignition system on a burner? - ANSWER-typically 120 VAC 2 / 3
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What is the difference between a safety relief and a safety valve?
- ANSWER-relief valves open gradually and safety valves open
fully at setpoint pressure
What valve acts similar to a check valve in a hot water system? - ANSWER-flow control
Boiler water having a high alkalinity could develop: -
ANSWER-caustic embrittlement
Draft is a difference in pressure that causes: - ANSWER-air or
gases to flow
Where would scale form on a boiler? - ANSWER-below the water line
What voltage causes the spark to jump the gap and ignite the fuel in an ignition system on an oil boiler? - ANSWER-10,000 VDC
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