G1-G3

Question 1

7 performance characteristics of a burner

Answer 1

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

Question 2

6 main components of an atmospheric burner

Answer 2

Burner ports 
Burner head
Venturi 
Orifice 
Mixing tube
Primary air shutter

Question 3

Why is a luminous flame yellow

Answer 3

Carbon in the flame biting off

Question 4

Where are luminous flame burners used

Answer 4

Range top pilots
Fireplace lighters
Sandpan burners

Question 5

Explain the operation of a atmospheric burner

Answer 5

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

Question 6

Bernoulli’s theorem

Answer 6

High velocity low pressure

Question 7

Limits of flam nat gas

Answer 7

4-14%

Question 8

2 methods of measuring flame speeds

Answer 8

Bunsen burner m1 in oa tube

Question 9

Flame speed of natural gas for each measurement method

Answer 9

Bunsen 12 inches / sec

Tube 25 in / sec

Question 10

Which is faster burning hydrogen or acetylene

Answer 10

Hydrogen

Question 11

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

Answer 11

8.75

Question 12

Name the three zones of a Bunsen flame

Answer 12

Outer mantle outer cone inner cone

Question 13

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

Answer 13

Outer mantle

Question 14

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

Answer 14

10% gas and air

Question 15

What is port loading

Answer 15

Amount of gas/air mixture passing thru a port

Question 16

For most applications what is port loading for natural gas

Answer 16

25000 30000

Question 17

2 most common results of unstable flames

Answer 17

Flashback and liftoff

Question 18

How does flashback occur

Answer 18

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

Question 19

What conditions may cause a waving flame

Answer 19

Drafts cracked heat exchangers

Question 20

What conditions cause flame rollout

Answer 20

Overfiring
Vent blockage
Decreased sec air supply

Question 21

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

Answer 21

Orifice is too large

Question 22

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

Answer 22

Orifice is too large

Question 23

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

Answer 23

High gas pressure

Question 24

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

Answer 24

Low gas pressure
Clogged filter
Clogged orifice

Question 25

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

Answer 25

Orifice too small use of manufactured gas (coke gas)

Question 26

3 main functions of a pilot burner

Answer 26

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

Question 27

Two main types of pilot burner

Answer 27

Aerated | Non aerated

Question 28

Two types of single port burners

Answer 28

Inshot | Upshot

Question 29

Advantages of a multi port burner

Answer 29

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

Question 30

Name some common types of multi port burners

Answer 30

Drilled port Drilled pipe Slotted port Ribbon port

Question 31

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

Answer 31

Greater port length reducing flashback | More opportunity for secondary air to surround the flame jet

Question 32

What is the range of port sizes for drilled port burners

Answer 32

No larger than 29 | No smaller than 42

Question 33

What are the critical factors in a drilled pipe burner design

Answer 33

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

Question 34

What are the disadvantages of the slotted port burner

Answer 34

Slots must be narrow, subject to plugging | Length of slot causes warping in hot places

Question 35

Which type of burner uses a ceramic burner for radiating surface

Answer 35

Infrared radiant burner

Question 36

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

Answer 36

Barber burner

Question 37

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

Answer 37

Upstream of the combustion chamber

Question 38

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

Answer 38

Natural draft burner

Question 39

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

Answer 39

Forced draft burner

Question 40

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

Answer 40

Induced draft burner

Question 41

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

Answer 41

Fan assist burner

Question 42

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

Answer 42

Pre mix burner

Question 43

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

Answer 43

Zero governor

Question 44

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

Answer 44

Blower mix burner

Question 45

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

Answer 45

Then blast tube