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Lvl. 4 Gas - Exam #2 > Notes J6-J10 > Flashcards

Notes J6-J10 Flashcards

1
Q

Fan-assisted BURNERS overcome the resistance of the ________ only. Remaining flue gases ________ draft out.

A

Burner

Naturally

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2
Q

Fan assisted APPLIANCE has a draft through the entire appliance and is not equipped with? and do not need ________ ____

A

draft control

dilution air

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3
Q

Draft control requires ________ ____ and is not part of the combustion process

A

dilution air

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4
Q

Fan assisted burners require?

A

draft control and dilution air

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5
Q

Dilution air is ___cuft per 1000btuh

A

15cuft

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6
Q

Natural draft depends on the _________ of the flue gases. It also requires _________ and _________ air

A

buoyancy

combustion and dilution

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7
Q

Natural draft appliances typically require which type of venting?

A

B vent or chimney liner

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8
Q

Fan assisted burners provide higher combustion ________

A

efficiency

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9
Q

Fan assisted burner regulate the ________ air supply fore the burner only

A

combustion

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10
Q

In a fan assisted appliance, the fan does not develop _____ pressure. It still depends on ________ for draft

A

vent pressure

bouyancy

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11
Q

What device is equipped above a burner in a fan assisted burner appliance to aid in buoyancy?

A

neutralizing device

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12
Q

Fan assisted burners are also equipped with _____ _____ to prove the burner fan is on

A

flow switches

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13
Q

Why are fan assisted appliances more susceptible to condensation?

A

Because they provide lower flue temperatures than natural draft

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14
Q

What is the vent connector?

A

Attaches the appliance to the chimney

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15
Q

Vent connectors can be B or C vent. True or False?

A

True

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16
Q

Vent connectors may or may not include draft control. True or False?

A

True

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17
Q

The main/common/chimney vent, may only be __ vent

A

B

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18
Q

Common vent must be __ vent

A

B

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19
Q

No reducing vent connectors may be used. True or False?

A

True

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20
Q

Max lateral length is __” for every 1” diameter of common vent pipe

A

18”

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21
Q

Draft is created through a _______ or _________ difference in the system

A

pressure or temperature

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22
Q

Draft is mainly affected by?

A

Height and temperature

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23
Q

In draft, as height increases, pressure _________

A

decreases

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24
Q

The longer the chimney, the greater the pressure difference which results in ________ draft

A

greater

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25
Q

Greater height creates more hot gas and rise. True or False?

A

True

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26
Q

In dampers, a _____ or valve regulates the flow

A

plate

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27
Q

Gas appliances require flue with draft control to remove what?

A

products of combustion

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28
Q

What are the three purposes of a draft hood?

A
  1. Neutralize stack effect
  2. Provide dilution air
  3. Provide spillage relief
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29
Q

Dilution air ____ and ____ the flue gas

A

slows and cools

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30
Q

Propane tanks are ________ and cylinders are __________

A

stationary

portable

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31
Q

LPG gases are made up of?

A

Propane and butane

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32
Q

LNG stands for?

A

Liquid natural gas

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33
Q

Propane tanks up to 1000USWG are built to what spec? (Abbreviation)

A

ASME

34
Q

Propane tanks range between 120USWG and ______USWG

A

1000

35
Q

All propane tanks have what certification that explains which province or territory in which they can be installed?

A

C.R.N

36
Q

Cylinder sizes range from __lb to _____lb

A

1 to 420lb

37
Q

1lb camping cylinders are non-refillable. True or False

A

TRUE

38
Q

Can gas cylinders be laid on their side?

A

NO

39
Q

Why can gas cylinders not be laid horizontal?

A

The safety valve is immersed in liquid

40
Q

Cylinders must undergo re-qualification every __ years

A

10

41
Q

Length of the dip tube on a fixed liquid level gauge indicates the max level the cylinder can be filled. True or False?

A

True

42
Q

What is the purpose of the 80% refill rule?

A

To leave 20% space for vapour

43
Q

It is practical to stop re-filling a cylinder when?

A

Liquid comes out of the spit valve

44
Q

Where can you find the information on how long of a dip-tube to install for a specific cylinder?

A

By the marking on the neck of that cylinder

45
Q

Vapour service is POL ______ threads and Liquid service is POL _____ threads

A

female

male

46
Q

Tanks have a pressure rating of ____ or ____ psi

A

250 or 312psi

47
Q

Cylinders have a rating of ____ psi

A

375psi

48
Q

A vehicle tank pressure rating would be ____psi and a home tank would be ____

A

312psi

250psi

49
Q

Cylinders have ____ valve, tanks have _______

A

one

multiple

50
Q

Less liquid level in a propane cylinder/tank causes additional vaporization which causes what?

A

a wetted surface

51
Q

As demand for vapour increases, what is required ?

A

additional heat

52
Q

Sweating of the tank, due to a low liquid level, acts as an insulator which makes it even harder to boil. True or False?

A

True

53
Q

At -45F, there is zero vapour pressure. True or False?

A

True

54
Q

In the winter, why is crucial to have a high level of liquid?

A

To aid in vaporization due to low ambient temperatures

55
Q

Two questions you must ask when sizing propane storage?

A

how fast can we turn liquid to gas?

what is the ambient temperature?

56
Q

Where can information on underground installations be found?

A

Annex H

57
Q

Natural gas is stored at ____f, slightly _____ atmospheric pressure

A

-260f slightly above

58
Q

Propane cylinder re-qualification must be done by an organization approved by ?

A

DOT/Transport Canada

59
Q

It is against the law to refill an outdated cylinder. True or False?

A

True

60
Q

Tanks that have been re-qualified will have what marking?

A

An E on the end date

61
Q

On permanent tank installs, the regulators are installed where?

A

First stage at the tank and second stage at the house before entry

62
Q

How does two-stage regulation reduce freeze-ups?

A

It mitigates extreme pressure drops

63
Q

Freeze-ups occur between what temperatures?

A

35-45f

64
Q

First stage regulators are normally what colour?

A

Red

65
Q

Second stage regulators are normally what colour?

A

Green

66
Q

Bonnet vents shall be pointed _______ outdoors. EXCEPT WHEN INSTALLED IN A DOME

A

downward

67
Q

When final stage regulator is not equipped with internal relief. One must be installed immediately downstream. True or False?

A

True

68
Q

Wood is not acceptable to stand cylinders on. True or False?

A

True

69
Q

A hydrostatic relief is for liquid propane lines only. True or False?

A

True

70
Q

Vapour is what is needed to provide btuh. Use _________ to help meet your load demands.

A

Vaporizers.

71
Q

Underground installations are relatively constant due to?

A

Constant ground temperatures

72
Q

Orifices must be cleaned:

a) small brush
b) small file
c) solvents

A

c

73
Q

Digester gas is considered a renewable resource because?

A

generates no net co2

74
Q

Intermittent pilot means the pilot burns the entire cycle. True or False

A

True

75
Q

What is the max pressure a b fitter can work on?

a) 5psig
b) 100 psig
c) no limit

A

c)

76
Q

CEUL is not recognized in BC as being qualified. True or False?

A

True

77
Q

If the exhaust vent is blocked the ________ will not allow the burner to run

A

inducer

78
Q

Orifice size controls the _________ of gas

A

volume

79
Q

Second diaphragm controls?

A

downstream pressure

80
Q

Under normal conditions, what tells the fan to shut off in a furnace?

A

temperature cools down

81
Q

Vent termination shall 90 and turn _________

A

downwards

82
Q

Low water and low gas supply are examples of a limit and a safety. true or False?

A

True

Lvl. 4 Gas - Exam #2 (9 decks)

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