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10 Cards in this Set
- Front
- Back
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_____ burner heads are most common for use in heating boilers. 1) Rectangular 2) Circular 3) Triangular 4) Semi-circular 5) Oval |
Rectangular |
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An intermittent pilot: 1) Must be manually ignited 2) Lights a pilot flame then extinguishes 3) Lights the main flame then extinguishes 4) Lights the main flame and remains on with it 5) Remains on when the main flame extinguishes |
Lights the main flame and remains on with it |
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A solenoid type fuel valve: 1) Is held closed by electrical current 2) Is held closed by fuel pressure 3) Always opens rapidly 4) Does not have positive shut-off 5) Closes slowly |
Is held closed by fuel pressure |
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Atmospheric burners are used for: 1) Coal firing 2) Lowering the relative humidity in the combustion air 3) Ring type burners 4) Warming the incoming combustion air 5) Gas stoves, hot water heaters, heating furnaces and many heating boilers |
Gas stoves, hot water heaters, heating furnaces and many heating boilers |
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One of the advantages of the refractory (gas) burner is: 1) The flue gases are recirculated back to the furnace to increase the furnace temperature 2) Low cost 3) The air and gas mixture is thoroughly preheated before it enters the furnace 4) The flue gases are thoroughly post-heated before it leaves the furnace 5) The flame is directed to areas where it is needed the most |
The air and gas mixture is thoroughly preheated before it enters the furnace |
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Gas burners for heating boilers can be divided into two general classes: 1) Pre and post purge burners 2) Pre and post turbulence burners 3) Pre and after mix burners 4) Pre and post combustion burners 5) Before and after burners |
Pre and after mix burners |
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The Venturi tube in the atmospheric burner mixing head has a: 1) Sharply increasing cross-sectional area 2) Gradually increasing cross-sectional area 3) Sharply decreasing cross-sectional area 4) Gradually decreasing cross-sectional area 5) Uniformly distributed cross-sectional area |
Gradually increasing cross-sectional area |
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The amount of pre-mix air to an atmospheric burner should be: 1) 20% to 30% 2) 30% to 40% 3) 5% to 8% 4) 40% to 50% 5) 10% to 12% |
30% to 40% |
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The main function of a gas burner is: 1) A source of ignition 2) Regulation of the fuel flow 3) Air flow control 4) Atomization of the fuel 5) Provision of air fuel contact |
Provision of air fuel contact |
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The _____ pilot is most often used on a small boiler. 1) Manual 2) Intermittent 3) Automatic 4) Interrupted 5) Continuous |
Continuous |
