Low Pressure Boilers Chapter 3

Front 1

The water in a boiler is heated, turns to steam, and leaves the boiler through the ______________ .

Back 1

main steam line

Front 2

When steam releases heat in the heat exchanger, it turns to ______________ .

Back 2

condensate

Front 3

What type of pump returns condensate from the system back to the boiler?

Back 3

vacuum

Front 4

What valve allows the flow of water in one direction?

Back 4

The check valve

Front 5

The feedwater _________ valve should be located as close to the shell of the boiler as practical.

Back 5

stop

Front 6

A ________ after each heating unit allows condensate to pass through to the return line.

Back 6

steam trap

Front 7

What may be required on some boilers to remove oxygen and other gases?

Back 7

feedwater heater

Front 8

The feedwater _____ valve opens and closes automatically.

Back 8

check

Front 9

The vacuum pump pumps water and discharges air to the __________ .

Back 9

atmosphere

Front 10

The range of pressure on the vacuum switch is usually ___________ .

Back 10

2" to 8"

Front 11

The primary function of a low water fuel cutoff is to _________ .

Back 11

shut down the burner if the water level drops below the safe operating level

Front 12

Water added to the boiler to replace water lost due to leaks and blowing down is know as _____ water.

Back 12

makeup

Front 13

Excessive use of cold city makeup water reduces overall boiler efficiency because the water must be ______ before use in the boiler.

Back 13

heated

Front 14

An auxiliary low fuel cutoff is installed ________ .

Back 14

slightly below the primary low water fuel cutoff

Front 15

The _____ shuts off the burner in the event of low water.

Back 15

low water fuel cutoff

Front 16

Water is supplied to the condensate return tank by the ______ pump.

Back 16

vacuum

Front 17

The feedwater regulator is located at the ______.

Back 17

NOWL

Front 18

The ________ maintains a constant water level in the boiler.

Back 18

feedwater regulator

Front 19

The low water fuel cutoff should be tested ________ .

Back 19

daily

Front 20

The burner should be _____ when the low water fuel cutoff is blown down.

Back 20

firing

Front 21

A high water level condition in the boiler could lead to water hammer.

Back 21

True

Front 22

A low water level condition in the boiler can result in damage to boiler heating surfaces.

Back 22

True

Front 23

The check valve on the feedwater line should be located closest to the shell of the boiler.

Back 23

False

Front 24

The check valve allows the flow of water in one direction only.

Back 24

True

Front 25

The check valve on the feedwater line commonly has a valve disc that swings to open and close the valve.

Back 25

True

Front 26

A condensate return tank collects condensate returned from heating units for use in the boiler.

Back 26

True

Front 27

A globe valve used as a feedwater stop valve must be installed so inlet pressure is applied from under the valve disc.

Back 27

True

Front 28

The stop valve on the feedwater line should be located closest to the boiler.

Back 28

True

Front 29

The vacuum pump is designed to discharge air and pump water.

Back 29

True

Front 30

Centrifugal feedwater pumps are commonly driven by steam.

Back 30

False

Front 31

A check valve is opened by turning the handle counterclockwise.

Back 31

False

Front 32

A low water fuel cutoff is located slightly below the NOWL.

Back 32

True

Front 33

The range of pressure on the vacuum switch on a vacuum pump is usually 2″ to 8″.

Back 33

True

Front 34

An evaporation test is performed by opening the low water fuel cutoff blowdown valve by hand.

Back 34

False

Front 35

Any loss of water in the system must be made up by the makeup water feeder.

Back 35

True

Front 36

The boiler operator must be present during an evaporation test.

Back 36

True

Front 37

The makeup water feeder can be used as feedwater.

Back 37

False

Front 38

Most makeup water contains some scale-forming salts.

Back 38

True

Front 39

The function of the automatic makeup water feeder is to replace water that has been lost.

Back 39

True

Front 40

The automatic city water makeup water feeder is located slightly below the NOWL.

Back 40

True