Burners for boilers Flashcards
The reducing of oil into very small particles is termed:
A) Turbulence B) Atomization C) Fluidization D) Fractionation E) Distillation
B) Atomization
The purpose of the deflector vanes in the center of a ring (gas) burner is to:
A) Increase the gas velocity
B) Promote turbulence of gas and air mixture
C) Atomize the gas particles
D) Increase the temperature of the furnace
E) Decrease the air velocity
B) Promote turbulence of gas and air mixture
Oil burners can be divided into three classes:
- Air and steam atomizing burners
- Mechanical or pressure atomizing burners
- Centrifugal or rotary cup burners
- Atmospheric pressure burners
- Gravitational pressure burners
A) 1, 2, 4 B) 1, 2, 3 C) 2, 3, 5 D) 3, 4, 5 E) 2, 3, 4
B) 1, 2, 3
A three-nozzle burner has secondary and tertiary nozzles ignited by the:
A) Continuous pilot B) Igniter spark C) Intermittent pilot flame D) Primary burner E) Interrupted pilot
D) Primary burner
A very popular packaged boiler gas burner is the:
A) Mechanical atomizing burner B) Post mix atmospheric burner C) Cluster nozzle burner D) Non-articulated burner E) Ring burner
E) Ring burner
The _____ pilot is most often used on a small boiler.
A) Manual B) Automatic C) Interrupted D) Continuous E) Intermittent
D) Continuous
A refractory burner disadvantage is its:
A) Excessive preheat B) Low radiant heat C) Low combustion efficiency D) Tendency to overheat E) High initial cost
E) High initial cost
Gas burners for heating boilers differ mainly in the way air and fuel mix. They can be divided into two general classes:
A) Pre and after mix burners B) Pre and post turbulence burners C) Pre and post combustion burners D) Pre and post purge burners E) Before and after burners
A) Pre and after mix burners
A solenoid type fuel valve:
A) Is held closed by electrical current B) Closes slowly C) Does not have positive shut-off D) Always opens rapidly E) Is held closed by fuel pressure
E) Is held closed by fuel pressure
The main function of a gas burner is:
A) Regulation of the fuel flow B) Atomization of the fuel C) A source of ignition D) To provide intimate O2 fuel contact E) Air flow control
D) To provide intimate O2 fuel contact
The advantage of an automatic gas valve is that the valve opens _____, thus preventing “furnace puff”.
A) Quickly B) Slowly C) Halfway D) Slightly E) Immediately
B) Slowly
An air atomizing compressor is usually a/an:
A) Regenerative type B) Axial type C) Centrifugal type D) Variable displacement type E) Rotary type
E) Rotary type
An intermittent pilot:
A) Remains on when the main burner extinguishes
B) Lights the main burner and remains on with it
C) Lights a pilot burner then extinguishes
D) Lights the main burner then extinguishes
E) Must be manually ignited
B) Lights the main burner and remains on with it
To which of the following oil burners is the oil supplied under high pressure?
A) Rotary cup burner B) Air atomizing burner C) Multi-spud burner D) Mechanical atomizing burner E) Premix atomizing burner
D) Mechanical atomizing burner
The venturi tube in the atmospheric burner mixing head has a:
A) Sharply increasing cross-sectional area
B) Gradually decreasing cross-sectional area
C) Gradually increasing cross-sectional area
D) Sharply decreasing cross-sectional area
E) Uniformly distributed cross-sectional area
C) Gradually increasing cross-sectional area
