Low Pressure Boilers Chapter 1

Front 1

What is necessary to generate steam in a boiler?

Back 1

A container, water and heat.

Front 2

What part of the boiler has water on one side and heat on the other?

Back 2

The heating surface.

Front 3

What type of boiler has heat and gases of combustion that pass through tubes surrounded by water?

Back 3

A fire-tube boiler.

Front 4

What type of boiler has water in the tubes and heat and gases of combustion passing around the tubes?

Back 4

A watertube boiler.

Front 5

What is used in boilers to direct the gases of combustion over the boiler heating surface?

Back 5

Baffles

Front 6

Sensible heat is heat that __________ ?

Back 6

Can be measured with a thermometer.

Front 7

What is used to transfer heat from one substance to another without allowing the materials to mix?

Back 7

A heat exchanger

Front 8

In the _________ , air mixes with fuel and burns.

Back 8

Combustion chamber.

Front 9

________ combustion is combustion that occurs when fuel is burned using only theoretical amount of air?

Back 9

Perfect

Front 10

_________ air is air supplied to a burner above the theoretical amount required to burn the fuel to ensure complete combustion.

Back 10

Excess

Front 11

The breaking up of fuel into small particles to maximize contact of fuel with air for combustion is ___________ ?

Back 11

Atomization

Front 12

What type of system provides the air necessary for combustion?

Back 12

A draft system.

Front 13

What is the highest pressure in pounds per square inch at which a boiler can be safely operated?

Back 13

MAWP

Front 14

What type of boiler does not use tubes?

Back 14

Cast iron

Front 15

What is done to increase the efficiency of the boiler?

Back 15

The heating surface is increased.

Front 16

What are the four systems necessary to operate a boiler?

Back 16

Feedwater, fuel, draft, and steam.

Front 17

________ pressure is the pressure caused by the weight of air surrounding the earth.

Back 17

Atmospheric

Front 18

Name three things a boiler does during operation.

Back 18

Holds water, transfers heat to the water to produce steam, and collects the steam that is produced.

Front 19

At what temperature does water turn to steam at atmospheric pressure?

Back 19

212 degrees Fahrenheit.

Front 20

What type of boilers have expandable sections that can be assembled on-site to produce the boiler capacity required?

Back 20

Cast iron

Front 21

What is the amount of energy required to raise 1 pound of water 1 degree Fahrenheit?

Back 21

1 Btu

Front 22

How is heat transferred?

Back 22

By conduction, convection, and radiation

Front 23

What is a component that is directly attached to the boiler that is required for the operation of the boiler?

Back 23

A fitting

Front 24

The nonflammable material used to insulate the outer surface of the boiler from heat is _____________ ?

Back 24

Refractory

Front 25

______________ is pure steam at a temperature that corresponds to the boiling point of water at a specific pressure?

Back 25

Saturated steam

Front 26

Steam is formed when water is heated to its boiling point. T or F

Back 26

True

Front 27

A boiler is an open metal container in which water is heated to produce steam or heated water. T or F

Back 27

False

Front 28

Water begins to boil at 212°F at atmospheric pressure. T or F

Back 28

True

Front 29

In a scotch marine boiler, the gases of combustion pass through tubes that are surrounded by water. T or F

Back 29

True

Front 30

Oxygen is needed to burn fuel. T or F

Back 30

True

Front 31

Condensate is typically returned to the boiler for reuse. T or F

Back 31

True

Front 32

The steam system supplies water to the boiler. T or F

Back 32

False

Front 33

Steam leaves the boiler through the main steam line. T or F

Back 33

True

Front 34

Steam that has given up its heat and turned back to water is boiler water. T or F

Back 34

False

Front 35

Heat is generated in a boiler by the combustion of a fuel such as gas, fuel oil, or coal. T or F

Back 35

True

Front 36

An internal furnace is a furnace in a boiler that is surrounded by heating surface. T or F

Back 36

True

Front 37

Feedwater is water that is treated for use in a boiler. T or F

Back 37

True

Front 38

Heat always flows from a material having a lower temperature to a material having a higher temperature. T or F

Back 38

False

Front 39

Latent heat is heat identified by a change of state and no temperature change of the substance. T or F

Back 39

True

Front 40

Conduction is heat transfer that occurs when molecules in a material are heated and the heat is passed from molecule to molecule through the material. T or F

Back 40

True

Front 41

Approximately 212 lb of air are required to burn a pound of fuel. T or F

Back 41

False

Front 42

The ASME Code governs boiler design, material, method of construction, inspection,and quality assurance. T or F

Back 42

True

Front 43

A low pressure boiler is a boiler that has an MAWP over 15 psi. T or F

Back 43

False

Front 44

A package boiler is a self-contained unit that is pre-assembled at the factory. T or F

Back 44

True

Front 45

A firebox boiler is a cylindrical scotch marine boiler. T or F

Back 45

False