2Nd Class Fireman, High Pressure Boilers, Chapter 7, Exam

Front 1

Atomizing burners use a ____ to break the fuel oil into small particles for combustion

Back 1

Sprayer or nozzle

Front 2

Rotary cup burners use a _____ to discharge fuel oil with high-velocity air into a boiler

Back 2

Quickly spinning cup

Front 3

Soot blowers are not needed when _____ is used as boiler fuel

Back 3

Natural gas

Front 4

Components required for proper natural gas flow into a burner include ____

Back 4

Solenoid valves, gas regulators, and blowers

Front 5

Using a _____ burner makes it possible to burn the fuel that is least expensive at a particular time of year

Back 5

Combination gas/fuel oil

Front 6

Pulverized coal burned in suspension requires a furnace temperature of approximately _____ degrees Fahrenheit to achieve complete combustion

Back 6

3000

Front 7

_____ were developed to help overcome pollution problems in large industrial boilers

Back 7

Fluidized-bed boilers

Front 8

The amount of NOx produced decreases as the _____

Back 8

Combustion temperature decreases

Front 9

A burner that premixes fuel and air and has flue gas recirculation (FGR) rates of 25% to 30% can achieve NOx levels of less than _____ ppm

Back 9

10

Front 10

New boilers that use ____ to treat the gases of combustion can reduce NOx levels to below 4 ppm

Back 10

Selective catalytic reduction

Front 11

Burning a fuel releases _____

Back 11

Heat energy

Front 12

A vent line on a fuel oil tank prevents ____ when filling the tank with fuel oil and also prevents a vacuum from developing when fuel oil is removed

Back 12

Pressure buildup

Front 13

A high suction line on a fuel oil tank is used when ____

Back 13

Signs of sludge and water are evident in the tank

Front 14

The purpose of the fuel oil return line is to ____

Back 14

Circulate fuel oil during warm-up, return fuel oil that bypasses the burner, return fuel oil from the relief valve

Front 15

In both steam and air atomizing burners, atomization is accomplished by ____

Back 15

High fuel oil pressure.

Front 16

The amount of gas going to the burner at startup in a high-pressure gas system is controlled by a solenoid-controlled ____ valve

Back 16

Diaphragm

Front 17

Pulverized coal burns ____

Back 17

In suspension

Front 18

An indication of a dirty fuel oil strainer would be ____ across the strainer

Back 18

A large pressure drop

Front 19

Duplex strainers are found on _____ of the fuel oil pump

Back 19

Both the suction and discharge sides.

Front 20

Fuel oil heaters must always be used when burning No. _____ fuel oil

Back 20

6

Front 21

A safety relief valve is used to protect against excessive fuel oil ____ that could damage the shell of a fuel oil heater

Back 21

Pressure

Front 22

A rotary cup burner atomizes fuel oil using ____

Back 22

Both a spinning cup and high-velocity air

Front 23

In a pressure atomizing burner, atomization is accomplished by _____

Back 23

Air or steam mixing with the oil.

Front 24

A gas pressure regulator is used to control the _____

Back 24

Desired gas pressure at the burner

Front 25

A solenoid valve is a direct-acting valve in the gas system used _____

Back 25

To regulate the flow of gas to the burner.

Front 26

To prevent caking and to dry the coal entering a pulverizer ____

Back 26

Warm air is used

Front 27

Blowers are used in a high-pressure gas system to ____

Back 27

Supply air for combustion

Front 28

The air-fuel ratio can be maintained by a(n) ____

Back 28

Air damper, butterfly valve, modulating motor and linkage

Front 29

The thickness of the fuel bed on a chain grate stoker is regulated by a coal ____

Back 29

Gate

Front 30

Boilers are equipped with a combination gas/fuel oil burner to allow _____

Back 30

More flexible operation

Front 31

Spreader stokers burn coal ____

Back 31

In suspension and on grates

Front 32

To achieve complete combustion in a spreader stroker, air is introduced ____

Back 32

Under and over the fuel bed

Front 33

The amount of NOx decreases as the ____

Back 33

Combustion temperature decreases

Front 34

An aboveground storage tank (AST) is a tank and any underground piping connected to the tank that has ____ % of its combined volume underground

Back 34

Less than 10

Front 35

____ is an emissions control method in which ammonia gas is introduced over a catalyst located in a module that is installed in the boiler exhaust stack

Back 35

Selective Catalytic Reduction (SCR)

Front 36

Both plug-and-tip and sprayer plate atomizers require fuel oil pressures of ___ psi or higher for atomization.

Back 36

100.

Front 37

The two basic types of ___ atomizing burners are the outside-mixing and inside-mixing types.

Back 37

Steam.

Front 38

Steam at a pressure ___ psi higher than the fuel oil pressure is usually required for atomization.

Back 38

20.

Front 39

Inlet pressures of about ___ are required for rotary cup burners.

Back 39

8 psi to 10 psi.

Front 40

A required vent line is installed on a fuel oil tank with a minimum pipe size of ___′′.

Back 40

1.25 inches

Front 41

An underground storage tank (UST) is a tank and any underground piping connected to the tank that has ___% of its combined volume underground.

Back 41

At least 10.

Front 42

A large pressure drop across a strainer indicates that a strainer is ___.

Back 42

Dirty.

Front 43

A ___ is installed after the fuel oil heater to protect against excessive fuel oil pressure.

Back 43

Safety relief valve.

Front 44

___ is the carbon deposits resulting from incomplete combustion.

Back 44

Soot.

Front 45

Soot acts as a(n) ___ when deposited on the heating surface of a boiler.

Back 45

Insulator.

Front 46

In a high-pressure gas burner, a ___ is a formed sheet-metal plate with slots where the metal is bent on an angle.

Back 46

Register.

Front 47

A(n) ___ blower is a blower with a wheel that has blades attached at the rim and rotates in a housing.

Back 47

Squirrel Cage.

Front 48

Gas leaks in a low-pressure system usually occur up to the ___.

Back 48

Zero gas governor.

Front 49

A gas supply line is fitted with a pressure gauge calibrated in ___ and in ounces per square inch.

Back 49

Inches of water column.

Front 50

Fluid-powered gas valves are ___ valves that use a small internal hydraulic pump.

Back 50

Slow-opening, fast-closing.

Front 51

The most important valve on a low-pressure gas system is the ___.

Back 51

Manual reset valve.

Front 52

Coal ash can contain many environmental contaminants such as _____

Back 52

Mercury, cadmium, and arsenic.

Front 53

A low-gas-pressure switch opens to secure the system if there is a(n) _____ pressure.

Back 53

Drop in natural gas.

Front 54

If a VFD is not used, the correct _____ is maintained by mechanical linkage between the air damper, the butterfly valve, and the modulating motor.

Back 54

Air-fuel ratio.

Front 55

On a low-pressure gas system, the _____ is located on the gas line to the boiler and shuts off the gas supply if the pilot flame goes out or a low-water condition exists.

Back 55

Manual reset valve.

Front 56

A fluidized-bed boiler is designed to have a thick bed of ______ through which air is blown at a high enough velocity to maintain the bed material in suspension.

Back 56

Granular particles of limestone.

Front 57

What is created when water and soot mix?

Back 57

H2SO4 (sulfuric acid)