Low Pressure Boilers Chapter 5

Front 1

When burning No.6 fuel oil, the strainers should be cleaned at least once every _____ hours.

Back 1

24

Front 2

When cleaning a fuel oil strainer, the ____ must be carefully replaced to prevent air from entering the system.

Back 2

gasket

Front 3

The ____ pump draws fuel oil from the fuel oil tank.

Back 3

fuel oil

Front 4

The _____ valve protects the fuel lines and pump from excessive pressure.

Back 4

relief

Front 5

A high vacuum on fuel oil suction gauge normally indicates ________ .

Back 5

cold fuel or a dirty strainer

Front 6

Fuel oil burners are designed to provide fuel oil to the furnace in a ______ .

Back 6

fine spray

Front 7

The rotary cup burner uses ______ to atomize the fuel oil.

Back 7

a spinning cup and high velocity air

Front 8

In a low pressure gas burner, gas is mixed with air in the ____________ .

Back 8

mixing chamber before the burner register

Front 9

In a high pressure gas burner, the gas mixes with the air on the inside of the ________ .

Back 9

burner

Front 10

A ____ is a narrowed portion of the tube.

Back 10

venturi

Front 11

On a low pressure gas system, the manual reset cannot be opened until the _________ .

Back 11

pilot is lit

Front 12

________ coal is a hard coal.

Back 12

Anthracite

Front 13

In a high pressure gas system, the plant pressure ________ valve reduces gas pressure to the line pressure used in the system.

Back 13

regulating

Front 14

_______ coal is coal that is ground to a fine powder.

Back 14

Pulverized

Front 15

A _______ is a mechanical device for feeding coal consistently to the burner.

Back 15

stoker

Front 16

A(n) _______ is an air pressure-activated switch that closes after proving sufficient pressure of combination air from the forced draft fan.

Back 16

air proving switch

Front 17

A combination burner allows the operator to switch fuels ___________ .

Back 17

for economy, if there is a shortage of a fuel, if there is a failure in the fuel system being used

Front 18

Hard coal is __________ .

Back 18

anthracite coal with a high carbon content

Front 19

Soft coal is ______________.

Back 19

bituminous coal with a high volatile content

Front 20

A(n) ________ sensor senses light frequencies that are higher than those visible to the eye.

Back 20

ultraviolet

Front 21

A(n) _______ is a safety device that senses if the pilot light and/or main flame are lit.

Back 21

flame scanner

Front 22

The _____ of fuel oil is the lowest temperature at which it will flow as a liquid.

Back 22

pour point

Front 23

Fuel oil and gas are the most commonly used fuels in low pressure boilers.

Back 23

True

Front 24

The fire point temperature is higher than the flash point temperature.

Back 24

True

Front 25

A fuel oil relief valve is located between the fuel oil pump and the fuel oil discharge valve.

Back 25

True

Front 26

The fuel oil pump should be started with its discharge valve open.

Back 26

True

Front 27

Cold fuel oil in the tank will give a high suction reading.

Back 27

True

Front 28

A dirty strainer results in low suction readings.

Back 28

False

Front 29

Starting the fuel oil pump with its discharge valve closed causes the relief valve to open.

Back 29

True

Front 30

Fuel oil burners commonly use atomizing burners.

Back 30

True

Front 31

Rotary cup burners can burn only No. 2 fuel oil.

Back 31

False

Front 32

Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.

Back 32

True

Front 33

Air used to atomize fuel oil is primary air.

Back 33

True

Front 34

Secondary air is needed to burn the fuel oil efficiently.

Back 34

True

Front 35

In an air atomizing burner, steam and fuel are discharged to the burner for combustion.

Back 35

False

Front 36

The air atomizing burner uses compressed air to mix with the fuel oil to achieve a high degree of atomization.

Back 36

True

Front 37

Complete combustion is achieved in a gas burner by supplying the proper mixture of air and gas to the furnace.

Back 37

True

Front 38

In a rotary cup burner, the solenoid valve controls the flow of fuel through the fuel tube.

Back 38

True

Front 39

Fuel oil to be removed from the burner nozzle is purged with air.

Back 39

True

Front 40

A metal scraper is used to clean deposits on a fuel oil burner nozzle.

Back 40

False

Front 41

In a low pressure gas system, before the manual reset valve can be opened, the pilot must be lit.

Back 41

True

Front 42

The manual reset valve in the low pressure gas system closes if the boiler has a high water level.

Back 42

False

Front 43

A fuel oil heater is required when using No. 2 fuel oil.

Back 43

False

Front 44

Fuel oil is a liquid fossil fuel.

Back 44

True

Front 45

Plant flexibility is increased with the use of a combination burner.

Back 45

True

Front 46

Anthracite coal is hard coal.

Back 46

True

Front 47

Hard coal has a high volatile content.

Back 47

False

Front 48

Bituminous coal is soft coal.

Back 48

True

Front 49

Boilers burning soft coal need large furnace volumes to complete combustion.

Back 49

True

Front 50

Gases of combustion that contact boiler heating surfaces before combustion is completed cause soot and smoke.

Back 50

True

Front 51

Grates are only needed in hand-fired coal boilers to support the coal.

Back 51

False

Front 52

Smoke is a sign of incomplete combustion.

Back 52

True

Front 53

Smoke is less of a problem when burning hard coal as compared to soft coal.

Back 53

True

Front 54

Stokers were developed to reduce the amount of coal fed to the furnace.

Back 54

False

Front 55

Stoker firing allowed the design of larger coal-fired boilers.

Back 55

True

Front 56

The type of fuel used determines the fuel system accessories required.

Back 56

True

Front 57

Purging the lines and nozzles of an air atomizing burner at the end of its firing cycle keeps lines and nozzles clean for the next starting cycle.

Back 57

True

Front 58

Natural gas is a colorless and odorless fossil fuel.

Back 58

True

Front 59

Propane is lighter than natural gas and requires special handling.

Back 59

False

Front 60

The viscosity of fuel oil is the temperature at which it will burn continually when exposed to an open flame.

Back 60

False

Front 61

The flash point of fuel oil is the temperature at which it will resist burning.

Back 61

False

Front 62

It is best to burn fuel oil with a low flash point.

Back 62

False

Front 63

Pour point is the lowest temperature at which fuel oil will flow as a liquid.

Back 63

True

Front 64

A therm is the quantity of gas required to produce 100,000 Btu.

Back 64

True

Front 65

The temperature of the fuel in the fuel oil tank should be maintained at approximately 100°F.

Back 65

True

Front 66

Fuel oil in the storage tank must be kept below its flash point temperature.

Back 66

True

Front 67

The temperature of the fuel oil in the storage tank must be kept above the recommended pour point.

Back 67

True

Front 68

No. 6 fuel oil must be heated to the proper temperature in order to burn.

Back 68

True

Front 69

The flame scanner proves the main flame only.

Back 69

False

Front 70

The furnace must be purged after any flame failure.

Back 70

True