2Nd Class Fireman, High Pressure Boilers, Chapter 8, Exam

Front 1

A BTU is a measurement of the quantity of heat required to raise the temperature of ____ of water by 1 degree Fahrenheit

Back 1

1 pound

Front 2

When API is more than 10, the fuel is ____ than water

Back 2

Less dense

Front 3

A therm is a unit used to measure the heat content of natural gas and is equal to ____ BTU

Back 3

100,000

Front 4

____ coal, or soft coal, is a geologically younger coal that contains a low percentage of fixed carbon and a high percentage of volatile gas

Back 4

Bituminous

Front 5

A ____ furnace mixes burnable material, such as biomass, with fossil fuel for combustion

Back 5

Cofiring

Front 6

____ consists of 40% to 60% methane, depending on the makeup of the constituents forming the gas from the waste

Back 6

Landfill gas

Front 7

____ combustion occurs when all of the fuel is burned using only the theoretical amount of air

Back 7

Perfect

Front 8

____ air is supplied to a burner to atomize fuel oil or convey pulverized coal and control the rate of combustion

Back 8

Primary

Front 9

In combustion, the fuel combines with oxygen in the air to form carbon dioxide, ____, and traces of other compounds

Back 9

Water

Front 10

Carbon monoxide in the gases of combustion indicates ____

Back 10

Incomplete combustion

Front 11

The lowest temperature at which the vapor of fuel oil ignites when exposed to an open flame is its _____ point

Back 11

Flash

Front 12

Rank refers to the ____ of a coal

Back 12

Hardness

Front 13

Grade refers to the ____ of a coal

Back 13

Size, heating value, and ash content

Front 14

Air supplied to the burner that is more than the theoretical amount needed to burn a fuel is ____ air

Back 14

Excess

Front 15

When the temperature of fuel oil increases, it’s viscosity ____

Back 15

Decreases

Front 16

The lowest temperature at which fuel oil will flow is its ____ point

Back 16

Pour

Front 17

Fuel oil with a low flash point would be ____

Back 17

Dangerous to use

Front 18

A ____ fire extinguisher is the correct type of extinguisher to use on fuel oil fires

Back 18

Foam or dry chemical

Front 19

Air used to atomize fuel oil is _____ air

Back 19

Primary

Front 20

Air that controls how completely a fuel is burned is ____ air

Back 20

Secondary

Front 21

_____ combustion is when all the fuel is burned using only the theoretical amount of air

Back 21

Perfect

Front 22

_____ combustion is when all the fuel is burned using the minimum amount of excess air

Back 22

Complete

Front 23

Gases of combustion that cool on contact with the boiler heating surface before combustion is completed cause _____

Back 23

The formation of soot and smoke

Front 24

Air contains approximately ____ % oxygen

Back 24

21

Front 25

No. _____ fuel has the lowest specific gravity

Back 25

6

Front 26

Soot and smoke are the result of _____ combustion

Back 26

Incomplete

Front 27

Carbon monoxide in the flue gas indicates _____

Back 27

Incomplete combustion

Front 28

The lowest temperature at which fuel oil will burn continuously when exposed to an open flame is its _____ point

Back 28

Fire

Front 29

_____ must be heated to reach the required temperature for combustion

Back 29

No. 6 fuel oil

Front 30

Higher numbered fuel oils produce ____ lower numbered fuel oils

Back 30

More BTU/gal. than

Front 31

The viscosity of a fuel is expressed in _____

Back 31

Saybolt Universal Seconds (SSUs)

Front 32

An ultimate analysis of coal provides information regarding _____

Back 32

Elements present in the coal

Front 33

_____ is biological material used as a renewable energy fuel

Back 33

Biomass

Front 34

_____ will support combustion but is not itself combustible

Back 34

Oxygen

Front 35

The letter M in the acronym MATT stands for _____

Back 35

Mixture of air and fuel

Front 36

Fuel oil BTU/gal. range?

Back 36

137,000 BTU/gal. to 150,000 BTU/gal.

Front 37

What is No. 2 fuel oil BTU/gallon?

Back 37

141,000 BTU/gallon.

Front 38

What is the specific gravity of water?

Back 38

One.

Front 39

What does natural gas mainly consist of?

Back 39

Methane.

Front 40

What is the heating value of natural gas?

Back 40

950 BTU/cubic foot to 1050 BTU/cubic foot.

Front 41

What are the elements in a coal specimen?

Back 41

N: nitrogen

O: oxygen

C: carbon

A: ash

S: sulfur

H: hydrogen

Front 42

What are the three combustibles in fuel that combine with oxygen in air?

Back 42

Carbon, Hydrogen, and Sulfur.

Front 43

What is needed to achieve complete combustion?

Back 43

M.A.T.T

- the proper mixture of air and fuel, proper atomization, proper fuel temperature, and sufficient time are required.

Front 44

What are the three T’s?

Back 44

Time, Temperature, and Turbulence.

Front 45

Anthracite coal is safer to stockpile than _____ because it is not as susceptible to spontaneous combustion.

Back 45

Bituminous coal.

Front 46

The ___ is the amount of heat that can be obtained from burning a fuel.

Back 46

Heating value.

Front 47

No. 6 fuel oil is a heavy, black oil that is relatively difficult to handle and must be ___ before use.

Back 47

Heated.

Front 48

___ point is the lowest temperature to which a fuel must be heated to burn continuously when exposed to an open flame.

Back 48

Fire point.

Front 49

Viscosity of oil is reported as the ___ viscosity, which is the time it takes for 60 ml of oil to flow through a calibrated tube at a specific temperature.

Back 49

Saybolt.

Front 50

When the °API is more than 10, the fuel is ___.

Back 50

Less dense than water.

Front 51

A ___ is a unit used to measure the heat content of natural gas and is equal to 100,000 Btu.

Back 51

Therm.

Front 52

___ coal is a geologically young coal that contains a low percentage of fixed carbon and a high percentage of volatile gas.

Back 52

Bituminous.

Front 53

A ___ furnace is a furnace that mixes burnable material, such as biomass, with a fossil fuel for combustion.

Back 53

Cofiring.

Front 54

A cofiring furnace is normally limited to about ___% biomass to maintain the flame and stay within the limits of EPA air standards.

Back 54

10.

Front 55

___ is/are gas produced by the biological breakdown of organic matter in the absence of oxygen.

Back 55

Digester gas.

Front 56

___ combustion is combustion that occurs when all the fuel is burned using a minimum amount of excess air.

Back 56

Complete.

Front 57

___ air is the air supplied to a furnace by draft fans to control combustion efficiency by controlling how completely the fuel is burned.

Back 57

Secondary.

Front 58

MATT is an acronym that stands for ___.

Back 58

Mixture, Atomization, Temperature, Time.

Front 59

Combustion of fuels occurs when the fuel combines with ___ to produce heat.

Back 59

Oxygen.

Front 60

Furnace efficiency is affected by ___ and the amount of heat that can be released.

Back 60

Furnace volume.

Front 61

What is air made of in percentages?

Back 61

21% Oxygen and 79% Nitrogen.