Low Pressure Boilers Chapter 6

Front 1

The induced draft fan is located in the ___.

Back 1

breeching

Front 2

The amount of natural draft present can be affected by ___.

Back 2

dampers opened or closed, temperature of the gases of combustion, height of the chimney

Front 3

Draft is the difference in pressure between two points that causes ___ to flow.

Back 3

air, natural gas, gases of combustion

Front 4

A ___ is a steel chimney used to direct the flow of gases of combustion from the boiler to the atmosphere.

Back 4

stack

Front 5

Forced draft and induced draft are two types of ___ draft.

Back 5

mechanical

Front 6

Mechanical draft is produced by ___.

Back 6

power-driven fans

Front 7

___ draft is air that is pulled through the boiler.

Back 7

Induced

Front 8

___ draft is produced when air is pushed through the burner.

Back 8

Forced

Front 9

When using ___ draft, the boiler is limited in the amount of fuel that can be burned.

Back 9

natural

Front 10

By using ___ draft, higher rates of combustion can be achieved.

Back 10

mechanical

Front 11

Cold outside air affects the amount of ___ draft produced.

Back 11

natural

Front 12

Draft gauge measurements are expressed in inches of ___.

Back 12

water column

Front 13

When measuring draft in the boiler, one leg of the tube is open to the boiler and the other to the ___.

Back 13

atmosphere

Front 14

A ___ is a simple draft gauge consisting of a U-shaped glass tube.

Back 14

manometer

Front 15

Improperly burned fuel results in ___.

Back 15

soot and smoke

Front 16

High combustion efficiency produces the maximum amount of ___ generated by the fuel.

Back 16

heat

Front 17

Too much draft when burning coal may cause ___.

Back 17

too hot a fire

Front 18

Combination forced and induced draft is also known as ___ draft.

Back 18

balanced

Front 19

Draft is the difference in pressure between two areas that causes air or gases of combustion to flow.

Back 19

True

Front 20

Gases move from an area of low pressure to an area of high pressure.

Back 20

False

Front 21

The two types of draft are mechanical and forced.

Back 21

False

Front 22

Mechanical draft is produced by a fan or blower.

Back 22

True

Front 23

Air is necessary for combustion process to take place.

Back 23

True

Front 24

Dampers are used to control the flow of air and gases of combustion.

Back 24

True

Front 25

Approximately 75 lb of air is required for every pound of fuel burned.

Back 25

False

Front 26

The amount of natural draft generated is affected by the height of the chimney.

Back 26

True

Front 27

The two types of mechanical draft are forced and induced.

Back 27

True

Front 28

The induced draft fan is located on the front of the boiler.

Back 28

False

Front 29

Extraordinary changes that occur in the oxygen content of the gases of combustion indicate a potential problem in the fuel system and/or draft system.

Back 29

True

Front 30

When using natural draft, the boiler is limited in the amount of fuel that can be burned.

Back 30

True

Front 31

The forced draft fan is located in the breeching.

Back 31

False

Front 32

Some boilers have combination forced and induced draft fans.

Back 32

True

Front 33

Draft gauges are calibrated in the same way as pressure gauges.

Back 33

False

Front 34

A cool stack condition can result in condensation of water vapor in the gases of combustion.

Back 34

True

Front 35

Natural draft produces greater amounts of draft in the winter than in the summer.

Back 35

True

Front 36

Proper control of draft results in higher combustion efficiency.

Back 36

True

Front 37

When using a manometer to measure draft, the liquid level in one leg is compared to the liquid level in the other leg.

Back 37

True

Front 38

The amount of draft determines the rate of combustion.

Back 38

True