Steam Boilers Module 15 Sessions 3 and 4

Question 1

The most important fitting on a boiler is the \_\_\_\_\_\_\_\_\_\_\_.
A. Low water fuel cutoff
B. Feedwater regulator
C. Superheater
D. Safety valve

Answer 1

D. Safety valve

Question 2

To prevent failure from pressure over the MAWP, all steam boilers must be equipped with at least one \_\_\_\_\_\_\_\_\_\_\_\_.
A. Safety valve
B. Blowdown valve
C. Gauge glass
D. Feedwater heater

Answer 2

A. Safety valve

Question 3

A safety valve will \_\_\_\_\_\_\_\_\_\_\_.
A. Control the boiler operating range
B. Control high or low water
C. Prevent the boiler from exceeding its MAWP
D. Control high and low fire

Answer 3

C. Prevent the boiler from exceeding its MAWP

Question 4

Safety valves are designed to _______________.
A. Open slowly to prevent water hammer
B. Pop open
C. Open only by hand
D. Open and then close with no drop in pressure

Answer 4

B. Pop open

Question 5

Superheater safety valves are set to open
A. After the main safety valves are opened
B. Before the main safety valves are opened
C. Only when header pressure is 6% above the MAWP
D. When the boiler is coming off-line

Answer 5

C. Only when header pressure is 6% above the MAWP

Question 6

When testing a safety valve by hand, there must be \_\_\_\_\_\_\_\_\_\_\_\_\_\_.
A. At least 75% of the popping pressure
B. No pressure on the boiler
C. An inspector present
D. Someone watching the water level

Answer 6

A. At least 75% of the popping pressure

Question 7

Any repairs to a safety valve should be done by the _____________.
A. Chief engineer
B. State inspector
C. Manufacturer’s authorized representative
D. Maintenance department

Answer 7

C. Manufacturer’s authorized representative

Question 8

The setting or adjusting of a safety valve should only be done by the ____________.
A. Boiler inspector
B. State inspector
C. Person in charge of the shift
D. Qualified person who is familiar with the construction and operation of a safety valve

Answer 8

D. Qualified person who is familiar with the construction and operation of a safety valve

Question 9

If it is necessary to test the relieving capacity of a safety valve ____________.
A. An accumulation test is put on the boiler
B. A hydrostatic test is put on the boiler
C. The boiler must be secured and off-line
D. A bench test must be done

Answer 9

A. An accumulation test is put on the boiler

Question 10

The relieving capacity of a safety valve is measured in ____________.
A. British thermal units
B. Boiler Horsepower
C. Btu per boiler horsepower
D. Pounds of steam per hour capable of discharging under a given pressure

Answer 10

D. Pounds of steam per hour capable of discharging under a given pressure

Question 11

The main purpose of a water column is to ____________.
A. Reduce turbulence in the gauge glass to get a more accurate reading of the water level in the boiler
B. Reduce surface tension
C. Provide a means of putting an accumulation test on the boiler
D. Provide a place to install the boiler gauge glass

Answer 11

A. Reduce turbulence in the gauge glass to get a more accurate reading of the water level in the boiler

Question 12

Try cocks are \_\_\_\_\_\_\_\_\_\_\_\_.
A. Found on watertube boilers
A Found on firetube boilers
C. A secondary means of determining water level in a boiler
D. Used to collect boiler water samples

Answer 12

C. A secondary means of determining water level in a boiler

Question 13

When replacing a broken gauge glass, the water level is checked by ____________.
A. Blowing down the gauge glass
B. Blowing down the water column
C. Using the try cocks
D. Never check the water level; secure the boiler during repairs

Answer 13

C. Using the try cocks

Question 14

The water column and gauge glass should usually be blown down \_\_\_\_\_\_\_\_\_\_\_\_.
A. Once per week
B. Once per shift
C. When the boiler is coming off-line
D. Never blow down under pressure

Answer 14

B. Once per shift

Question 15

A Whistle valve is used to ____________.
A. Indicate it is 12:00 noon
B. Indicate a shift change
C. Warn the operator of high or low water
D. Warn the operator of a leaking blowdown line

Answer 15

C. Warn the operator of high or low water

Question 16

A steam pressure gauge is calibrated in \_\_\_\_\_\_\_\_\_\_\_\_.
A. Pounds per cubic inch
B. Btu per pound
C. Pounds per temperature increase
D. Pounds per square inch

Answer 16

D. Pounds per square inch

Question 17

A siphon protects the steam pressure gauge from \_\_\_\_\_\_\_\_\_\_\_\_.
A. Boiler pressure
B. High temperature of steam
C. Water entering the Bourdon tube
D. Air entering the Bourdon tube

Answer 17

B. High temperature of steam

Question 18

The pressure at the base of a vertical foot of water is \_\_\_\_\_\_\_\_\_\_\_\_ psi.
A. O.433 
B. 8.3
C. 14.7
D. 34.5

Answer 18

A. O.433

Question 19

The boiler vent is located at the ____________.
A. Main steam line
B. Superheater outlet
C. Highest part of the mud drum
D. Highest part of the steam side of the boiler

Answer 19

D. Highest part of the steam side of the boiler

Question 20

The boiler vent is open when warming up a boiler until ____________.
A. The boiler is cut in on the line
B. There is 2 to 3 psi of steam pressure on the boiler
C. The superheater drain is closed
D. An operator manually closes it

Answer 20

D. An operator manually closes it

Question 21

Steam separators work on the principle of ____________.
A. Potential energy
B. Kinetic energy
C. Trapping steam and letting water through
D. Changing the direction of the steam flow

Answer 21

D. Changing the direction of the steam flow

Question 22

The dry pipe is located in the ____________.
A. Upper part of the steam and water drum
B. Superheater outlet header
C. Main steam line
D. Line before the turbine throttle

Answer 22

A. Upper part of the steam and water drum

Question 23

Cyclone separators are used in \_\_\_\_\_\_\_\_\_\_\_\_.
A. Low to medium pressure boilers
B. Boilers equipped with superheaters
C. Boiler chimneys
D. Boiler breeching

Answer 23

B. Boilers equipped with superheaters

Question 24

Saturated steam is steam at ____________.
A. A higher temperature than its corresponding pressure
B. Its corresponding temperature and pressure
C. A dry state
D. The superheater outlet

Answer 24

B. Its corresponding temperature and pressure

Question 25

When steam is superheated the ____________. A. Pressure is increased along with its temperature B. Volume increases C. Temperature increases with no increase in pressure D. Pressure increases

Answer 25

C. Temperature increases with no increase in pressure

Question 26

``` Superheater tubes are protected from warping or burning out by ____________. A. A Continuous flow of steam B. Circulation of steam and Water C. Continuous circulation of hot air D. Circulation of flue gases ```

Answer 26

A. A continuous flow of steam

Question 27

Soot should be ____________. A. Removed from boiler tubes for better heat transfer B. Left on boiler tubes to protect them from burning out C. Only left on superheater tubes D. Saved to cover lines running outside

Answer 27

A. Removed from boiler tubes for better heat transfer

Question 28

``` Soot blowers are mainly found on ____________. A. Waterwalls B. Watertube boilers C. Firetube boilers D. Main breeching ```

Answer 28

B. Watertube boilers

Question 29

Steam impinging on boiler tubes would ____________. A. Keep tubes exceptionally clean B. Cut through the boiler tubes in a very short period of time C. Have no effect on boiler tubes D. Cause undue thermal shock

Answer 29

B. Cut through the boiler tubes in a very short period of time

Question 30

To ensure that moisture-free steam goes to the soot blower, the steamline to the soot blower must come off the ____________. A. Main steam line B. Superheater outlet header C. Highest part of the steam side of the drum D. Waterwall outlet

Answer 30

C. Highest part of the steam side of the drum

Question 31

Boilers in battery equipped with manhole openings must have ____________ according to the ASME code. A. Two main steam stop valves B. One main steam stop valve C. No valves between boiler and header D. Boilers in battery have no manhole openings

Answer 31

A. Two main steam stop valves

Question 32

``` Main boiler stop valves must be ____________ valves. A. OS&Y gate B. OS&Y globe C. Quick-closing lever-type D. Plug-type ```

Answer 32

A. OS&Y gate

Question 33

The main steam stop valves should be gate valves because they ____________. A. Can restrict the flow of steam B. Can be used as throttling valves C. Do not have to be fully open D. Offer no restriction to the flow of steam

Answer 33

D. Offer no restriction to the flow of steam

Question 34

When the boiler is equipped with hand-operated, main steam stop valves, to cut the boiler in on the line, the steam pressure on the incoming boiler should be ____________. A. Slightly higher than line pressure B. Equal to line pressure C. Slightly lower than line pressure D. Makes no difference; pressure will equalize

Answer 34

C. Slightly lower than line pressure

Question 35

``` During boiler warm-up, to remove any condensate trapped between the two boiler stop valves, the ____________ should be open. A. Free-blowing drain B. Superheater drain C. Boiler vent D. Equalizing line ```

Answer 35

A. Free-blowing drain

Question 36

``` The three major causes of a low water condition in a boiler are: carelessness or inattention, over firing of a boiler, and ____________. A. Defects in a system B. Poor maintenance C. Buying poor quality boilers D. Inexperienced workers ```

Answer 36

A. Defects in a system

Question 37

During normal usage, the main boiler steam line expands and contracts. To allow for this ____________. A. Rigid pipe hangers are used B. Expansion bends are used C. The main steam line must be welded to external braces D. Nothing has to be done; this will take care of itself

Answer 37

B. Expansion bends are used

Question 38

``` According to the ASME code, boilers operating at 100 psi or over must have ____________. A. No bottom blowdown valves B. Only one bottom blowdown valve C. Two bottom blowdown valves D. Up to manufacturer of boiler ```

Answer 38

C. Two bottom blowdown valves

Question 39

When blowing down a boiler equipped with a quick-opening valve and A screw-type valve, the quick-opening valve is ____________. A. Opened first and closed last B. Opened last and closed first C. Opened first and closed first D. Opened as operator prefers

Answer 39

A. Opened first and closed last

Question 40

``` The maximum size of the bottom blowdown line and the surface blowdown line is: A. 1 1/2 B. 2 1/2 C. 3 D. No maximum size required ```

Answer 40

B. 2 1/2

Question 41

``` Bottom blowdown lines on a water tube boiler are located on the ____________. A. Mud drum B. Bottom of the steam and water drum C. Superheater outlet header D. Lowest part of the combustion chamber ```

Answer 41

B. Bottom of the steam and water drum

Question 42

The most accurate means of deciding the frequency of blowdown of a boiler is determined by a ____________. A. Flue gas analysis B. Boiler operator C. Boiler water analysis D. The feedwater chemical sales representative

Answer 42

C. Boiler water analysis

Question 43

Surface tension on the water in the steam and water drum is increased by ____________. A. Impurities that float on the surface of the water B. Inexperienced boiler operators C. Very soft water D. A high steam load

Answer 43

A. Impurities that float on the surface of the water

Question 44

To protect sewer lines from the high temperature and high pressure coming from the boiler blowdown lines ____________. A. Traps are used B. Blowdown tanks are used C. Steam separators are used D. Nothing has to be used. They can handle all temperatures and pressures

Answer 44

B. Blowdown tanks are used