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Lvl. 3 - Gas Exam 1 > Notes: > Flashcards

Notes: Flashcards

1
Q

CH4 Methane Temperatures

  1. _____ approx ignition temp
  2. ______ approx flame temp (air)
  3. ______ approx flame temp (oxygen)
A
  1. 1300F
  2. 3600F
  3. 5900F
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2
Q

C3H8 Propane temperatures:

  1. 920F approx ______ temp
  2. 3600F approx ______ temp (air)
  3. 5900F approx ______ temp (oxygen)
A
  1. ignition
  2. flame
  3. flame
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3
Q

Ch4 methane has a calorific value of ______btu/ft3

A

1000btu/ft3

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4
Q

Ch4 methane has a specific gravity of

A

0.55 or 0.6

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5
Q

Liquid methane has a specific gravity of

A

0.3

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6
Q

C3H8 propane has a calorific value of

A

2520btu/ft3

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7
Q

Why is propane dangerous?

A

it is denser than air so it will fill a room ground up before you smell it

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8
Q

C3H8 propane has a specific gravity of

A

1.52

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9
Q

Liquid propane has a specific gravity of

A

0.51

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10
Q

Methane Expansion Ratio:

  1. Boiling point:
  2. 1 ft3 liquid =
A
  1. -260F

2. 1:600ft3

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11
Q

Propane Expansion Ratio:

  1. Boiling point:
  2. 1 ft3 liquid =
A
  1. -44F

2. 270ft3

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12
Q

What is the Volume, Pressure, Temperature Formula

A

V1T2P1 = V2T1P2

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13
Q

What does ASME stand for?

A

American society of mechanical engineers

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14
Q

Combustion air supplies:

  1. combustion air = __ft3/1000btu
  2. excess air = __ft3/10000btu
  3. dilution air = __ft3/1000btu
  4. total air __ft3/1000btu
A
  1. 10ft
  2. 5ft
  3. 15ft

30ft

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15
Q

Propane tank relief valve setting is at ?

A

312 or 250psi

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16
Q

propane cylinder relief valve setting is at ____psi

A

375psi

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17
Q

Primary liquid natural gas relief valve set at ____ of tank

A

MAWP

18
Q

secondary liquid natural gas relief valve set at ____ times MAWP of tank

A

1.5 times

19
Q

Secondary relief valve is _______ and primary is piped away

A

exposed

20
Q

Air supply inlet opening from outdoors shall be located not less than ___” above outside grade (code) but safety regulation requires __”

A
  1. 12”

2. 24” (right answer)

21
Q

Anything over ___” nominal pipe size must be welded

A

2 1/2”

22
Q

Depth of dirt or drip pocket is minimum _”

A

3”

23
Q

Two types of oil fired burners:

  1. flame ______- head
  2. high ______ burner
A
  1. flame-retention head

2. high static burner

24
Q

Why are duplex filters used?

A

allows for replacement of one without disrupting the other

25
Q

what does a premix (inspiration burner) use to entrain air?

A

gas under pressure

26
Q

What does a premix (aspirator) use to create a negative pressure and draw in gas?

A

air pressure

27
Q

forced draft is produced by a device ________ of combustion chamber

A

upstream

28
Q

Fan assist is located ______ of combustion chamber

A

upstream

29
Q

Forced draft requires a strong fan as it overcomes resistance of the appliances heat _______

A

exchanger

30
Q

A typical pilot burner has an ______ orifice

A

insert

31
Q

The more tapered angle of approach on an orifice means a higher ____ flow rate

A

gas

32
Q

Higher _ factor means better flow characteristics through the orifice

A

K

33
Q

Use a hand ____ to adjust orifice sizes

A

hand

34
Q

larger drill size the _______ the hole

A

smaller

35
Q

choose ______ orifice if between numbers

A

smaller

36
Q

Orifice flow fundamentals:

  1. doubling the area ______ the flow
  2. double diameter ________ the flow
  3. quadrupling the pressure ______ the flow
  4. quadrupling the specific gravity ______ the flow
A
  1. doubles
  2. quadruples
  3. doubles
  4. halves
37
Q

Orifice size is determined by the _________

A

manufacturer

38
Q

The higher the altitude the less _____ the air is and less oxygen it has

A

dense

39
Q

Appliances shall be adjusted to the ____ _________ rating on the nameplate

A

high altitude

40
Q

standard high altitude rating is _____-_______Ft

A

2000-4500ft

41
Q

When an appliance is installed above 4500ft, the certified high altitude input rating shall be reduced at the ratio of __% per additional 1000ft

A

4%

Lvl. 3 - Gas Exam 1 (10 decks)

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