Burners for boilers Flashcards

1
Q

The reducing of oil into very small particles is termed:

A) Turbulence
B) Atomization
C) Fluidization
D) Fractionation
E) Distillation
A

B) Atomization

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2
Q

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

A

B) Promote turbulence of gas and air mixture

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3
Q

Oil burners can be divided into three classes:

  1. Air and steam atomizing burners
  2. Mechanical or pressure atomizing burners
  3. Centrifugal or rotary cup burners
  4. Atmospheric pressure burners
  5. Gravitational pressure burners
A) 1, 2, 4
B) 1, 2, 3
C) 2, 3, 5
D) 3, 4, 5
E) 2, 3, 4
A

B) 1, 2, 3

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4
Q

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
A

D) Primary burner

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5
Q

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
A

E) Ring burner

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6
Q

The _____ pilot is most often used on a small boiler.

A) Manual
B) Automatic
C) Interrupted
D) Continuous
E) Intermittent
A

D) Continuous

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7
Q

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
A

E) High initial cost

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8
Q

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

A) Pre and after mix burners

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9
Q

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
A

E) Is held closed by fuel pressure

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10
Q

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
A

D) To provide intimate O2 fuel contact

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11
Q

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
A

B) Slowly

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12
Q

An air atomizing compressor is usually a/an:

A) Regenerative type
B) Axial type
C) Centrifugal type
D) Variable displacement type
E) Rotary type
A

E) Rotary type

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13
Q

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

A

B) Lights the main burner and remains on with it

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14
Q

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
A

D) Mechanical atomizing burner

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15
Q

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

A

C) Gradually increasing cross-sectional area

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16
Q

Improper adjustment of the electrodes, poor insulation, or weak ignition may cause delayed ignition in a fuel oil combustion system resulting in a:

A) Corrosion damage
B) Puff back
C) Gas valve failure
D) Water hammer
E) Pressure explosion
A

B) Puff back

17
Q

The motorized gas valve uses a cam or pump to operate the valve. Both types of valve use:

A) Quick to open, slow to close
B) A diaphragm assembly
C) An electric motor
D) Spring and supply pressure to open
E) An armature tapping bleed
A

C) An electric motor