gas

Question 1

T/F Low boy furnace is approximately 4 ft high

Answer 1

T

Question 2

What is the specifc gravity of natural gas?

Answer 2

0.6

Question 3

1 ft of natural gas will produce ______ BTU’s

Answer 3

1050

Question 4

Specific gravity of LP gas?

Answer 4

1.52

Question 5

T/F LP gas will produce 3200BTU/ft3 of gas burned.

Answer 5

T

Question 6

Combution need ________, __________, __________,. A reaction between them is called __________.

Answer 6

fuel, oxygen, heat, rapid oxidation

Question 7

What is the Venturi?

Answer 7

The reduction in the burner diameter.

Question 8

Yellow tips indicate there is too much __________. Orange tips indicate there is __________.

Answer 8

air, dust partictules

Question 9

Gas air mixture is _______% to ______% of gas.

Answer 9

4% to 15%

Question 10

Natural gas _______to ______ inch W.C

LP gas ______ inch W.C

Answer 10

3 to 3 1/2

11

Question 11

1 PSI = ______ inch W.C

Answer 11

27.7

Question 12

Ignigition or flame velocity is what?

Answer 12

The rate at which the flame travels

Question 13

Perfect combustion requies two parts _______ to one part ________.

Answer 13

two parts oxygen to one part methane

Question 14

Flame impingement is what?

Answer 14

When the flame is hitting the side of the combustion chamber causing it to be cooled.

Question 15

Automatic combination gas valve is also called ______________.

Answer 15

redundant gas valve

Question 16

The servo pressure regulator monitors the _______ of, or working pressure of gas valve.

Answer 16

outlet

Question 17

Intermittant pilot gas valve IFC has a _______ seconds to light the gas valve.

Answer 17

90

Question 18

Direct has ______ to _______ seconds to light.

Answer 18

4 to 12

Question 19

T/F Standing, Intermittant and Direct gas burners are redundant gas valves.

Answer 19

T

Question 20

T/F Redundant is 2 or 3 valves operators in series but wired in parrellel

Answer 20

T

Question 21

Induced draft have a combustion blower on the _________ of the outlet of the heat exchanger. They pull or suck causing a _______ pressure.

Answer 21

Outlet, negative

Question 22

Forced draft have a combustion blower motor on the _______, they push or blow casuing a __________ pressure.

Answer 22

inlet, positive

Question 23

The delta t will rise as the furnace _________ as efficinecy _________.

Answer 23

decreases , increases

Question 24

L tube goes to ________ to the S tube goes to the ________.

Answer 24

transistion box, collection box

Question 25

Aerated pilot does what?

Answer 25

air and gas mixed in the pilot before the burners

Question 26

Nonerated pilot use what?

Answer 26

secondary air at the point where combustion occurs

Question 27

Thermocouple tip is called ________.

Answer 27

hot juction 15 to 30 mv DC

Question 28

What is a thermoplie?

Answer 28

Serveral thermocouples wired in series to increase voltage. 500 mv DC

Question 29

________ lb of water vapor for every ____ lb of gas burned.

Answer 29

2, 1

Question 30

Combustion air has _________ and ________ air

Answer 30

primary and secondary

Question 31

What is dilution are?

Answer 31

Is excess air after combstion

Question 32

Excess air has ______ and _____ air.

Answer 32

combustion and dilution

Question 33

Horizontal runs should be sloped upward ______ inch per foot in venting.

Answer 33

1/4

Question 34

Horizontal runs should be installed with a pitch of _______ inch for each _______ ft run.

Answer 34

1/4 , 15

Question 35

What is in prefect combustion ____________.

Answer 35

Ultimate carbon dioxide.

Question 36

Flame retification produce

Answer 36

1 to 25 microamps

Question 37

Natrual gas perfect combustion

Answer 37

11.7 to 12.2

Question 38

Primary air adjusters on atmospheric type gas burners are usually

Answer 38

butterfly shutters

Question 39

Another name for a downflow heating unit is _________.

Answer 39

Counter flow

Question 40

The proper color of a gas flame is _______.

Answer 40

blue with slight orange tips

Question 41

The dangerous by product of poor combustion of gas is ________.

Answer 41

carbon monoxide posioning

Question 42

Three products of complete combustion of natural and LP gas are ________, _____________, _______________.

Answer 42

carbon dioxide, water vapor and heat

Question 43

The heat producing system includes the ________, and ___________, ________, the ____________, and the ________ system. The heated air distribution system consists of the _______ that moves the air throughtout the ductwork and the __________ assembly.

Answer 43

manifold, controls,burners, heat exchanger, venting system | blower, ductwork

Question 44

Natrual gas is composed of ______% to _____% __________ and other ______, almost all of which are combustible, which makes this gas efficient and clean burning.

Answer 44

90% to 95% | methane and other hydrocarbons

Question 45

Auxiliary limit switches are used for _________ and __________ furnaces.

Answer 45

counterflow and horizontal

Question 46

Auxiliary limit switches do what?

Answer 46

They monitor room return air temperture and interrupt burner operation when the temperture gets to hot.

Question 47

Air contains approximately _______% oxygen.

Answer 47

21

Question 48

THe ingition temperture for natural gas is _______F to _______F.

Answer 48

1100 to 1200

Question 49

The burning mixtures are known as the ___________ and are differnt for different gases.

Answer 49

limits of flammability

Question 50

T/F If too much air flow runs across the heat exchanger, the flue gas will become too cool and the products of combustion may condense and run down the flue pipe.

Answer 50

T

Question 50

T/F If too much air flow runs across the heat exchanger, the flue gas will become too cool and the products of combustion may condense and run down the flue pipe.

Answer 50

T

Question 51

The inshot burner is sometimes called a ________.

Answer 51

jet burner

Question 52

T/F High effcieny condensing furnaces operate below dew point temperture of the combustion gases to allow condensation to happen.

Answer 52

T

Question 53

Excess air decreases __________ increases.

Answer 53

Dew point temperature

Question 54

T/F conventional gas furnace use glue gas temperature and natural convention to vent the products of combustion

Answer 54

T