Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

G3 Himark > Module 3 > Flashcards

Module 3 Flashcards

1
Q

What is added to Natural Gas to make it easier to detect by odour

A

Butyl Mercaptan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is added to Propane to make it easier to detect by odour

A

Ethyl Mercaptan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What family are propane and natural gas part of?

A

Hydrocarbon family

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the composition of natural gas

A

Methane 89.68%, Ethane 4.68%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the chemical formula for natural gas

A

CH4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the chemical formula for propane

A

C3H8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

As a gas what is the relative density/ specific gravity of propane and gas

A

Natural gas - 0.55 Propane Gas 1.52

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the specific gravity of natural gas liquid and propane

A

Natural gas liquid - 0.3 Propane 0.51

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the boiling point of propane

A

-44 degrees F it will remain as a liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the boiling point of natural gas

A

-260 degrees F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the expansion rate of propane from liquid to vapour

A

1 to 270 times

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the expansion rate of natural gas from liquid to vapour

A

1 to 600 times

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

To what percentage do retailers fill propane containers

A

80% at 60 degrees F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is heating value (heat content)

A

The amount of heat energy released from burning of cubic ft of gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is a BTU

A

British Thermal Unit - The amount of heat required to raise 1 pound of water 1 degree F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What burns hotter, propane or natural gas

A

Propane

Propane produces 2520 BTU per cubic foot
Natural Gas produces 1000 BTU per cubic foot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the ignition temperature of Natural Gas

A

1300 degrees F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the ignition temperature of propane

A

920 degrees F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the limits of flammability for Natural Gas

A

4% to 15%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the limits of flammability for propane

A

2.5% to 9%

21
Q

What is the air to fuel ratio for complete combustion for natural gas

A

10 cubic feet of air to 1 cubic foot of gas (10:1)

22
Q

What is the air to fuel ratio for complete combustion for propane?

A

23.5 cubic feet of air to 1 cubic foot of gas (23.5:1)
On Assignment 2 it was rounded to 25:1

23
Q

What is the maximum flame temperature for natural gas and propane

A

3600 degrees F

24
Q

What is the flame speed for natural gas?

A

12” per second

25
Q

What is the flame speed for propane?

A

32” per second

26
Q

What is combustion?

A

The rapid oxidization of a fuel gas to produce light and heat

27
Q

What is air comprised of?

A

80% nitrogen 20% oxygen

28
Q

What type of air is premixed with gas prior to ignition?

A

Primary air

29
Q

What type of air surrounds the flame for combustion?

A

Secondary air

30
Q

What are the two types of air required for combustion?

A

Primary/Secondary air

31
Q

What is the purpose of dilution air?

A

Cooling hot flue gas, nothing to do with the combustion process

32
Q

What is the colour of luminous flame?

A

Yellow/orange

33
Q

What colour is a bunsen flame?

A

Blue

34
Q

What does a flame orange in colour mean?

A

bad fuel air mix

35
Q

What is the purpose of excess air?

A

To ensure complete combustion

36
Q

How much does 1 gallon of propane weigh?

A

5.1 lbs

37
Q

What are the products of complete combustion?

A

CO2, water vapour, nitrogen, heat and light

38
Q

Where do the products of complete and incomplete combustion go?

A

Outside.

39
Q

What is the specific gravity of CO?

A

.96, similar to air

40
Q

What are the products of incomplete combustion?

A

CO, water vapour, soot and aldehydes

41
Q

What are the symptoms of CO poisoning?

A

Flu like symptoms with no fever.

42
Q

What is combustion air?

A

Air required to complete the combustion process so as not to produce CO

43
Q

What is primary air?

A

Air that is mixed with fuel prior to ignition. Enters through the air shutter

44
Q

What is secondary air?

A

Air supplied to complete combustion, supplied around the flame.

45
Q

What is flame lifting?

A

The burner is over fired, too much primary air, the burner is cold.

46
Q

How are natural gas and propane transported?

A

Natural gas - pipeline
Propane - Tanks and cylinders.

47
Q

Why is propane so much hotter burning than natural gas?

A

Propane has more carbon and hydrogen atoms

48
Q

What is flashback?

A

When gas/air flow velocity is less than the flame speed.

G3 Himark (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions