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21 Cards in this Set
- Front
- Back
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The main function of a gas burner is
a) atomization of the fuel b) a source of ignition c) provision of O -fuel contact 2 d) regulation of the fuel flow e) air flow control |
C
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An atmospheric burner has air entering around the burner which is termed a) primary air b) secondary air c) atomizing air d) combustion air e) tertiary air |
B
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The amount of pre-mix air to an atmospheric burner should be a) 10 to 12% b) 5 to 8% c) 20 to 30% d) 30 to 40% e) 40 to 50% |
D
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A refractory burner disadvantage is a) high initial cost b) too much fuel preheat c) low radiant heat d) low combustion efficiency e) overheating of boiler metal |
A
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A very popular packaged boiler gas burner is the a) ring burner b) non-articulated burner c) post mix atmospheric burner d) mechanical atomizing burner e) cluster nozzle burner |
A
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An atmospheric burner head which is very popular on heating boilers is the a) refractory type b) star type c) ring type d) rectangular type e) ribbon ring type |
D
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When a gas fired burner is burning fuel properly a) it will have a blue flame with short yellow tips b) the furnace will pulsate c) there will be no turbulence d) it will have a long bright yellow flame e) the induced draft fan can be shut off |
A
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Gas burners for heating boilers can be divided into two general classes and they are the a) pre and post turbulence burners b) before and after burners c) pre and post purge burners d) pre and after mix burners e) pre and post combustion burners |
D
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The Venturi tube in the atmospheric burner mixing head has a a) gradually decreasing cross-sectional area b) gradually increasing cross-sectional area c) sharply decreasing cross-sectional area d) sharply increasing cross-sectional area e) uniformly distributed cross-sectional area |
B
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__________ burner heads are most common for use in heating boilers. a) Oval b) Circular c) Semi-circular d) Triangular e) Rectangular |
E
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One of the advantages of the refractory (gas) burner is the a) low cost b) gas and air mixture is thoroughly preheated before it enters the furnace c) flue gases are recirculated back to the furnace to increase the furnace temperature d) flue gases are thoroughly post-heated before they leave the furnace e) flame is directed to areas where it is needed the most |
B
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The purpose of the deflector vanes in the centre of a ring (gas) burner is to a) atomize the gas particles b) increase the gas velocity c) decrease the air velocity d) promote turbulence of the gas and air mixture e) increase the temperature of the furnace |
D
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One of the advantages of using natural gas as a fuel in a boiler is a) that no storage space is required b) the low cost c) the abundance in supply d) the portability e) that no transmission lines are required |
A
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An intermittent pilot a) lights the main flame then extinguishes b) must be manually ignited c) lights the main flame and remains on with it d) remains on when the main flame extinguishes e) lights a pilot flame then extinguishes |
C
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The pilot burner for gas fired heating equipment can be: 1. manual 2. continuous 3. intermittent 4. interrupted 5. automatic a) 1, 2, and 3 b) 2, 3, and 5 c) 2, 3, and 4 d) 3, 4, and 5 e) 1, 2, and 5 |
C
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The __________ pilot is most often used on small boilers. a) interrupted b) intermittent c) automatic d) manual e) continuous |
E
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Large capacity burners a) require high flow on ignition b) are very safe relative to puff-back c) require only a small pilot flame d) should have minimum flow on ignition e) are too hazardous and not recommended |
D
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A hydramotor valve a) opens and closes quickly b) helps to prevent puff-backs c) uses air as its working medium d) should not be the last fuel valve to open e) closes slowly |
B
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A solenoid type fuel valve a) is held closed by fuel pressure b) always opens rapidly c) is held closed by electrical current d) closes slowly e) does not have positive shut-off |
A
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If the power is cut off to an automatic gas valve, the valve will be a) closed slowly b) closed immediately c) closed slightly d) closed half-way e) opened widely |
B
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The advantage of a motorized (hydramotor) gas valve is that the valve opens __________ thus preventing "furnace puff". a) slowly b) quickly c) immediately d) slightly e) half-way |
A
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