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gas Flashcards

1
Q

T/F Low boy furnace is approximately 4 ft high

A

T

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2
Q

What is the specifc gravity of natural gas?

A

0.6

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3
Q

1 ft of natural gas will produce ______ BTU’s

A

1050

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4
Q

Specific gravity of LP gas?

A

1.52

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5
Q

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

A

T

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6
Q

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

A

fuel, oxygen, heat, rapid oxidation

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7
Q

What is the Venturi?

A

The reduction in the burner diameter.

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8
Q

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

A

air, dust partictules

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9
Q

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

A

4% to 15%

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10
Q

Natural gas _______to ______ inch W.C

LP gas ______ inch W.C

A

3 to 3 1/2

11

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11
Q

1 PSI = ______ inch W.C

A

27.7

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12
Q

Ignigition or flame velocity is what?

A

The rate at which the flame travels

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13
Q

Perfect combustion requies two parts _______ to one part ________.

A

two parts oxygen to one part methane

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14
Q

Flame impingement is what?

A

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

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15
Q

Automatic combination gas valve is also called ______________.

A

redundant gas valve

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16
Q

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

A

outlet

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17
Q

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

A

90

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18
Q

Direct has ______ to _______ seconds to light.

A

4 to 12

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19
Q

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

A

T

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20
Q

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

A

T

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21
Q

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

A

Outlet, negative

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22
Q

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

A

inlet, positive

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23
Q

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

A

decreases , increases

24
Q

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

A

transistion box, collection box

25
Q

Aerated pilot does what?

A

air and gas mixed in the pilot before the burners

26
Q

Nonerated pilot use what?

A

secondary air at the point where combustion occurs

27
Q

Thermocouple tip is called ________.

A

hot juction 15 to 30 mv DC

28
Q

What is a thermoplie?

A

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

29
Q

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

A

2, 1

30
Q

Combustion air has _________ and ________ air

A

primary and secondary

31
Q

What is dilution are?

A

Is excess air after combstion

32
Q

Excess air has ______ and _____ air.

A

combustion and dilution

33
Q

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

A

1/4

34
Q

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

A

1/4 , 15

35
Q

What is in prefect combustion ____________.

A

Ultimate carbon dioxide.

36
Q

Flame retification produce

A

1 to 25 microamps

37
Q

Natrual gas perfect combustion

A

11.7 to 12.2

38
Q

Primary air adjusters on atmospheric type gas burners are usually

A

butterfly shutters

39
Q

Another name for a downflow heating unit is _________.

A

Counter flow

40
Q

The proper color of a gas flame is _______.

A

blue with slight orange tips

41
Q

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

A

carbon monoxide posioning

42
Q

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

A

carbon dioxide, water vapor and heat

43
Q

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.

A

manifold, controls,burners, heat exchanger, venting system

blower, ductwork

44
Q

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

A

90% to 95%

methane and other hydrocarbons

45
Q

Auxiliary limit switches are used for _________ and __________ furnaces.

A

counterflow and horizontal

46
Q

Auxiliary limit switches do what?

A

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

47
Q

Air contains approximately _______% oxygen.

A

21

48
Q

THe ingition temperture for natural gas is _______F to _______F.

A

1100 to 1200

49
Q

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

A

limits of flammability

50
Q

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.

A

T

50
Q

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.

A

T

51
Q

The inshot burner is sometimes called a ________.

A

jet burner

52
Q

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

A

T

53
Q

Excess air decreases __________ increases.

A

Dew point temperature

54
Q

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

A

T

Gas (1 decks)

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