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pb1 gasfitting theory > Final Study > Flashcards

Final Study Flashcards

1
Q

What must the gasfitter make sure to do when leaving a job?

A

Make sure that all the appliances are in the safe working order

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2
Q

Removing the ground prong on a power tool can?

A

Kill you

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3
Q

Should an accident occur on a gas installation after taking all necessary precautions, the primary responsibility will be that of the:

A

Licensed gasfitter

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4
Q

The first thing to do when dismantling a gas appliance is:

A

Shut off the gas to the appliance

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5
Q

To ventilate a building in event of a propane gas leak:

A

The upper story windows should be opened and;

The basement windows should be opened

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6
Q

A unit of power or heat rate that is 1000 times the base unit is used to:

A

Used to rate appliances

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7
Q

A hydrocarbon gas is one that:

A

Is composed of hydrogen and carbon molecules

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8
Q

The average amount of energy released by burning a gas is given in?

A

BTU/CF (BTU/ft³)
or
kJ/m³

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9
Q

Manufactured gas is a product of?

A

Coal gasification

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10
Q

LP gases are so named because they are normally stored and transported as ______.

A

Liquids

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11
Q

S.T.P. is used in calculation of?

A

Standard gas volumes

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12
Q

Natural and propane gases are both naturally odorless, naturally colorless, and naturally non-_____ .

A

Non-toxic

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13
Q 
Mercaptan is 
A) odorless
B) colorless
C) non-combustible 
D) tensile
A

B) colorless

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14
Q

Is liquid propane more dense than water?

A

No. Liquid propane has a relative density of 0.51

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15
Q

The heating value of natural gas is

A

1000 BTU/CF or 37500 kJ/m³

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16
Q 
The maximum flame temperature of natural gas is:
A) lower than propane
B) higher than butane
C) higher than propane
D) (A) and (C) above
A

A) lower than propane

The maximum flame temperature of natural gas is 3500°F… Lower than that of both propane and butane at 3650°F and 3660°F

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17
Q 
Natural gas is:
A) A product of decaying organic matter
B) A byproduct of refining processes
C) distilled from crude oil
D) none of the above
A

A) A product of decaying organic matter

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18
Q

Referring to a gas what does LPG stand for?

A

Liquified Petroleum Gas

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19
Q

A cubic foot of natural gas weighs?

A

3/4 oz

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20
Q

The relative density of natural gas is?

A

0.6

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21
Q 
When a fuel gas is burned completely it will make:
A) water
B) soot
C) nitrogen
D) all of the above
A

D) all of the above

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22
Q

Carbon monoxide has a chemical symbol of:

A

CO

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23
Q

When a substance is combined with oxygen, the process is called:

A

Oxidation

24
Q

The most common method of extinguishing Type A fires is to remove the?

A

Oxygen

25
Q

The three T’s are?

A

Necessary for complete combustion:
Time
Temperature
Turbulence

26
Q

Does nitrogen in the air change in the combustion process?

A

No. Nitrogen is virtually unchanged in the combustion of gases

27
Q

The oxygen used for combustion makes up ____% of air

A

20%

28
Q

The main cause of incomplete combustion is?

A

Not enough combustion air

29
Q

Combustion is best described as:

A

Rapid oxidation

30
Q

What are the products of complete combustion?

A

Heat
Light
H2O
CO2

31
Q

Three factors necessary for combustion are:

A

Fuel
Heat
Air

32
Q

One cubic foot of air at STP weighs?

A

The density of air is 0.076 lbs/ft³ or 1.25 oz/ft³

33
Q

To get the same volume of gas per hour through a 1” pipe as through a 1 1/4” pipe:

A

The velocity has to increase

34
Q

Air has a density of?

A
  1. 076 lbs/ft³ @ STP 60°F at 29.92 Hg absolute

1. 29 kg/m³ @ STP 0°C at 101 kPa

35
Q 
Different types of piping affect pressure dropped because of different:
A) Wall thickness
B) threads
C) surface smoothness
D) all of the above
A

C) surface smoothness

36
Q

A column of water 12” high will exert a pressure of?

A

0.434 PSIG

37
Q

Manifold pressures are read with?

A

The main burners operating

38
Q

A pressure of 1 PSIG is equivalent to ____” W.C.

A

28” W.C.

39
Q

Standing line pressures are read with the main burners _____.

A

Off

40
Q

The operating pressure in a residential propane line is normally _____ than that of natural gas

A

Less

41
Q

Pressure in a propane system is at least ____” W.C.

A

11” W.C.

42
Q

The main purpose of a gas burner is to?

A

Mix the gas and air

43
Q

Burners are categorized by?

A

Flame pattern
Type of air mixing
Air supply methods

44
Q

A burner that has air mixed with gas before ignition is known as?

A

An aerated burner

45
Q

The primary purpose of a gas burner orifice is to?

A

Regulate gas volume

46
Q

To change your burner from burning natural gas to propane gas, what has to be adjusted?

A

The orifice size only

47
Q

Before dismantling any gas appliance or piping you should?

A

Shut off the gas &

Shut off the appliance power supply

48
Q

The abbreviation MPa indicates?

A

A unit of pressure

49
Q

Piping less than ____” shall not be concealed

A

1/2”

50
Q

Unthreaded portions of piping must extend through walls and ceilings at least ___”

A

1”

51
Q

Every hose and hose fitting must be rated for a minimum working pressure of ____ psig

A

350 psig

52
Q

A close nipple is one that?

A

Has none of the original wall thickness left…. all thread

53
Q 
Which of the following is almost never handled it as a liquid by the gasfitter?
A) propane
B) butane
C) natural gas
D) pentane
A

C) natural gas

54
Q

What is the maximum pressure allowed for building supply line piping?

A

2 psig

55
Q

Soot is produced by?

A

A lack of primary air

56
Q

Complete combustion requires

A

Controlled circumstances and

A proper air to fuel ratio

pb1 gasfitting theory (2 decks)

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