Gas Applicances

Front 1

what term is used to describe a burner flame tha moves back through the burner nozzle?

Back 1

flashback

Front 2

through which device is fuel discharged to the burner

Back 2

the orfice

Front 3

which type of burner prodcues a single large flame?

Back 3

a singe

or

mono port

Front 4

list four common types of multiple port burners

Back 4

1. drilled port

2. drilled pipe

3. ribbon port

4. slotted port

Front 5

maximum and minimum port diameters for drilled port burners

Back 5

max. no 29

min. no 42

Front 6

which type of power burner has combustion air supplied by a fan or blower under suffiecent pressure to overcome the restriction of the burner and the applicance ?

Back 6

force draft burner

Front 7

which type of burner has a fan located downstream of the combustion zone?

Back 7

induced draft burner

Front 8

what provides kinetic energy to the air required for a premixing inspirator type burner?

Back 8

the gas pressure issuing from an oridice into gas jet mixer

Front 9

what type of burner provides complete premixing using mechanical mixers

Back 9

blower mix

Front 10

what device is used to regulate gas supply to an asourator type burner

Back 10

zero govenor

Front 11

how to do you correct: a lifting flame

Back 11

reduce primary air

Front 12

how to do you correct: flashback

Back 12

reduce primary air

Front 13

how to do you correct: yellow tipping

Back 13

increase primary air

Front 14

how to do you correct: flam roll out (steady)

Back 14

reduce over -firing, remove possible vent blockage

Front 15

which atmospheric burner are most susceptible to flashback

Back 15

monoport

Front 16

what helps to keep the flame retained at the burner port of a monoburner?

Back 16

pilot

Front 17

what is a multiport burner susceptible to?

Back 17

clogging from lint

Front 18

what type of burner: has air drawn into burner by venturi action?

Back 18

atmospheric burn

Front 19

what type of burner: has air supplied to burner under enough pressure to overcome resistance of burner only?

Back 19

fan assist

Front 20

what type of burner: has air supplied to burner under enough pressure to overcome the resistance of the burner and the applicance ?

Back 20

power burn

Front 21

what type of burner: has air and gas mixed completely before introduction to the chamber by inspiration, aspiration or blower mix method?

Back 21

premixed burner

Front 22

what type of venting system: has air drawn in by a vaccum

Back 22

inspector

Front 23

what type of venting system: has air moving through the burner creating a neg. pressure that draws the gas into the burner to be mixed?

Back 23

aspirator

Front 24

what type of venting system: has gas drawn in by neg. pressure created by a blower that is also drawn in air for combustion?

Back 24

block

Front 25

what type of venting system: has a regulator designed to supply gas at or below atmo. pressure when a vaccum is induced on it

Back 25

zero govenor

Front 26

a burner must be capable of _______________ so fuel is completely burned

Back 26

mixing fuel gases and air together

Front 27

a mulitport burner flame front should not _______ as it moves from port to port

Back 27

delay

Front 28

a stable flame will not ______________________

Back 28

waver, flashback, or lift off

Front 29

there needs to be uniform heating across the burner surface; otherwise, uneven heat causes great stress on the ______________/

Back 29

heat exchanger

Front 30

burners turn down ratio is the accepted range of input for ________________

Back 30

Satisfactory combustion

Front 31

t.d.r. means that the burner can fire between ____% and _____% of the ________________ and still maintain a stable flame

Back 31

20%

to 100%

maximum rated input

Front 32

if btu/h input goes below ______%of max gas flow rate, flame will queech

Back 32

20%

Front 33

stable flame has characteristics by high appliance efficiency &

primary and secondary air supples are correct

Front 34

single port burners (mono) are simple in design

and need about 50% primary air to avoid yellow tipping

Front 35

multiport burners are most common and flames are better spread apart

Front 36

power burners can be used when air supply and venting is assisted by draft fan and assisted by blower

Front 37

when heat is applied to a rod and tub sensing device uts gas valve

Back 37

opens or closes

Front 38

thermocupes are power combustion safety circuits that

Back 38

have constant pilots , greater voltage, have a safety shutoff value if pilot light goes out

Front 39

thermopiles are made of..

Back 39

several thermcouples in series

Front 40

if there is too much primary air, the gas flame can...

Back 40

lift off and

make noise

Front 41

a furance with a vertical air flow through heat exchange er and the blower compartment beneath heather exchanger is an ...

Back 41

upflow

Front 42

the proper typical color of a gas flame is..

Back 42

sharp all blue

Front 43

primary air adjusters on atmospheric type gas burners usually consist of

Back 43

1. butterflu shutters

2. sliding sleeves

3. set screws

Front 44

in a conventional gas furnace , the hot flue gases are

Back 44

vented by natural convection

Front 45

T/F:

if flue gases ae not vented properly, CO poison could result

Back 45

true

Front 46

T/F:

liquidifed petroleym us geavier than and can cause suffocation if not handled properly

Back 46

true

Front 47

T/F:

a gas furance designed for use with natural gas can be used with LP with no system modifications

Back 47

false

Front 48

T/F:

a gas flame will carry eletrical energy

Back 48

true

Front 49

the gas flame will lift off burner and be noisy if it recieves too much primary air

Back 49

true

Front 50

natural gas utiities supply gas with a heat content of about 1000 btu/cu ft.

Back 50

true

Front 51

three main products of complete combustion of naturla and LP gas are

Back 51

N2

CO2

water vapour

heat

Front 52

a furnance with a hortizontal heat exchanger and a propeller fan for moving aur through the h.e. is called a...

Back 52

unit heater

Front 53

the dangerous by-product of poor combustion is..

Back 53

CO and aldihydes

Front 54

spark ignition is important for roof top or package units located outdoors because _____ problems.

Back 54

wind

Front 55

on a gas furnace, what enggizes the blower motor in the heat mode

Back 55

eletric timer, fan limit switch

Front 56

when a gas furnace ignites and is under "full fire" why does the fan not come on immediately

Back 56

heat exhaust needs more time to warm up

Front 57

why is "inches of water column" used to measure gas pressure instead of psig

Back 57

accuracy

Front 58

what is the difference between a yellow flame and a orange flame

Back 58

yellow - more seconary

orange - dust or lint

Front 59

the flame in a gas furnace is burner with heavy yellow tips

Back 59

needs more primary

Front 60

while the furnace is operating, heated air and flue products spill out of the burner compartment, what is the problem

Back 60

blockage

Front 61

when the burner ignites, the burner flame is normal until the blower starts at this time, continuous roll out occurs , what is the problem?

Back 61

cracked heat exchange

Front 62

why do propane and butane has furnaces require 100% shut off in the event of a power outages?

Back 62

specific gravity

Front 63

FURNACES:

A RETURN AND SUPPLY DUCT ARE BOTH OF TOP IT IS A ...

Back 63

LOW BOY

Front 64

FURNACES:

A BLOWER LOCATED BELOW A HEAT EXCHANGE IS A...

Back 64

UPFLOW

Front 65

FURNACES:

IS PRIMARILY USED IN CRAWL SPACE

Back 65

HORTZONTAL

Front 66

FURNACES:

BLOWER LOCATED ABOVE HEAT EXCHANGE

Back 66

DOWNFLOW

Front 67

NAME THREE MAJOR WAYS IN WHICH HEAT IS TRANSFERRED

Back 67

1. CONDUCTION

2. CONVECTION

3. RADIATION

Front 68

IN WHICH DIRECTION DOES HEAT ENGERY FLOW?

Back 68

WARM TO COLD

Front 69

WHAT HAPPENS WHEN A FLUID IS HEATED?

Back 69

IT EXPANDS AND BECOMES LIGHTER

Front 70

WHAT CONTROLS THE DRYING PERIOD OF A GAS FIRED CLOTHE DRYER

Back 70

MOISTER SENSOR OR TIMER

Front 71

WHAT NORMALLY CONTROLS THE AUTOMATIC GAS VALUE FOUND ON A CORCED WARM-AIR FURANCE

Back 71

THERMOSTAT

Front 72

WHERE IS THE BLOWER LOCATED ON A DOWN-FLOW FURNACE

Back 72

ABOVE HEAT EXCHANGER

Front 73

what is heat transferred from a cook top burner

Back 73

conduction

Front 74

name two ways in which the burner can be controlled on a unit heater

Back 74

wall mounted

switch

Front 75

what are three conditions are regulated in hot water boiler

Back 75

firing at boiler

boiler water temp

circuting

Front 76

which type of water heater system can be used for both domestic hot water supply and space heating

Back 76

conbination unit

Front 77

three types a gasfired units in a single room

Back 77

space heater

wall furnace

base board heater

Front 78

senses the operation of a cicuating pump

Back 78

flow switch

Front 79

a water temperature sensing device that will shut off the burner if the temperature exceeeds desred range

Back 79

high temperature aqua stat

Front 80

SHUTS OFF THE BURNER IN THE EVENT THAT THE PRESSURE IN A BOILER EXCEEDS DESIRED RANGE

Back 80

HIGH LIMIT

Front 81

TURNS A STEAM BOILER ON AND OFF TO MAINTAIN A DESIRED TEMP

Back 81

OPPERATING PRES. SWITCH

Front 82

TURNS A BOILER OR WATER HEATER ON TO KEEP DESIRED WATER TEMP

Back 82

LOW WATER CUT OFF

Front 83

ALLOWS HOT WATER TO ESCAPE FROM A SYSTEM IF THE PRESSURE EXCEEDS A PRESET MAX. VALUE

Back 83

PRESSURE RELIEF VALVE

Front 84

SHUTS DOWN BURNER IN THE EVENT OF A FAILURE TO VENT FLUE PRODUCT

Back 84

FLAME ROLL OUT SWITCH

Front 85

ALLOWS WATER TO EXCAPE IF TEMP. OR PRESS. EXCEEDS A PRESET VALUE INSIDE AHOT WATER HEATER

Back 85

TEMP. AND PRESSURE RELIEF VALVE.