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Gas Exam Prep > G1-G3 > Flashcards

G1-G3 Flashcards

1
Q

7 performance characteristics of a burner

A 
Complete combustion 
Rapid carryover of flames 
Quiet operation 
Immediate ignition
Stable flame 
Uniform heating
Wide turndown
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2
Q

6 main components of an atmospheric burner

A 
Burner ports 
Burner head
Venturi 
Orifice 
Mixing tube
Primary air shutter
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3
Q

Why is a luminous flame yellow

A

Carbon in the flame biting off

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4
Q

Where are luminous flame burners used

A

Range top pilots
Fireplace lighters
Sandpan burners

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5
Q

Explain the operation of a atmospheric burner

A

Premix of some combustion air before ignition produces a blue or Bunsen flame smaller and more stable

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6
Q

Bernoulli’s theorem

A

High velocity low pressure

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7
Q

Limits of flam nat gas

A

4-14%

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8
Q

2 methods of measuring flame speeds

A

Bunsen burner m1 in oa tube

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9
Q

Flame speed of natural gas for each measurement method

A

Bunsen 12 inches / sec

Tube 25 in / sec

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10
Q

Which is faster burning hydrogen or acetylene

A

Hydrogen

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11
Q

When referring to the graph in fig 6 what is the burning velocity of acetylene

A

8.75

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12
Q

Name the three zones of a Bunsen flame

A

Outer mantle outer cone inner cone

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13
Q

I’m which zone of the Bunsen flame is the gas completely burned

A

Outer mantle

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14
Q

The maximum flame speed of natural gas occurs at what mixture of gas and air

A

10% gas and air

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15
Q

What is port loading

A

Amount of gas/air mixture passing thru a port

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16
Q

For most applications what is port loading for natural gas

A

25000 30000

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17
Q

2 most common results of unstable flames

A

Flashback and liftoff

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18
Q

How does flashback occur

A

When flow velocity from the ports are greater than the burning speed

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19
Q

What conditions may cause a waving flame

A

Drafts cracked heat exchangers

20
Q

What conditions cause flame rollout

A

Overfiring
Vent blockage
Decreased sec air supply

21
Q

On a non aerated pilot burner what would cause a lazy yellow flame

A

Orifice is too large

22
Q

On a non aerated pilot burner, what would cause a lazy yellow flame

A

Orifice is too large

23
Q

On a non aerated pilot burner what causes a lifting blowing flame

A

High gas pressure

24
Q

On an aerated pilot burner what conditions cause a small blue flame

A

Low gas pressure
Clogged filter
Clogged orifice

25
Q

On a aerated pilot burner what conditions cause a hard sharp flame

A

Orifice too small use of manufactured gas (coke gas)

26
Q

3 main functions of a pilot burner

A

To ignite main burner flame
To provide a mount for thermocouple
To heat thermocouple or power pile

27
Q

Two main types of pilot burner

A

Aerated

Non aerated

28
Q

Two types of single port burners

A

Inshot

Upshot

29
Q

Advantages of a multi port burner

A

Provide good heat transfer
Spread flames for secondary air to reach them
Provide stable blue flames

30
Q

Name some common types of multi port burners

A

Drilled port
Drilled pipe
Slotted port
Ribbon port

31
Q

What are some of the advantages of cast iron drilled port burners w small raised bosses for each port

A

Greater port length reducing flashback

More opportunity for secondary air to surround the flame jet

32
Q

What is the range of port sizes for drilled port burners

A

No larger than 29

No smaller than 42

33
Q

What are the critical factors in a drilled pipe burner design

A 
Port size 
Tots port area 
Ratio of port area to cross section 
Total length 
Distance from mixer to first port
34
Q

What are the disadvantages of the slotted port burner

A

Slots must be narrow, subject to plugging

Length of slot causes warping in hot places

35
Q

Which type of burner uses a ceramic burner for radiating surface

A

Infrared radiant burner

36
Q

Which type of burner is arranged so that the streams of the gas air mixture intersect each other to slow velocity and maintain a stable flame through a wide turndown

A

Barber burner

37
Q

Where in relation to the combustion chamber would the combustion air blower be located in a forced draft burner system

A

Upstream of the combustion chamber

38
Q

What is the name for a class of burners that do not require assistance from a fan to supply combustion air or to vent the flue products according to the natural gas and propane installation code

A

Natural draft burner

39
Q

Which type of burner is equipped with a blower that produces just enough pressure to overcome the resistance of the burner and the appliance

A

Forced draft burner

40
Q

Which type of burner has the Dan located at the flue outlet of the appliance

A

Induced draft burner

41
Q

Which type of burner is equipped with a fan or blower that produces sufficient pressure to overcome the resistance of the burner only

A

Fan assist burner

42
Q

Which type of burner mixes the required amount of air and gas before ignition

A

Pre mix burner

43
Q

What device does an aspirating burner use to regulate the gas supply

A

Zero governor

44
Q

Which type of burner mixes the required air and gas with a mechanical device

A

Blower mix burner

45
Q

Which component of dual fuel burner directs the air fuel mixture to the appropriate part of the combustion chamber

A

Then blast tube

Gas Exam Prep (4 decks)

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