Book 11 Flashcards
The copper tube tubular heating boiler:
Select one:
a.
Are mostly gas fired
b.
Generates high pressure steam
c.
Has the furnace in the upper section
d.
Is highly susceptible to corrosion
Are mostly gas fired
Expanding of tubes into a tube sheet is also called:
Select one:
a.
Beading
b.
Rolling
c.
Flaring
d.
Peening
Rolling
According to ASME VII C2.426, how often should a boiler be blown down if it is not fitted with sampling connections?
a.
Weekly if soft water is used
b.
Once every shift
c.
At least once every 24 h
d.
2–3 times weekly if hard water is used
At least once every 24 h
When an air heater is used in a boiler:
Select one:
a.
The induced draft fan supplies combustion air to the air heater
b.
It increases the efficiency of the boiler
c.
The boiler usually has only a forced draft fan
d.
A balanced draft system cannot be used
It increases the efficiency of the boiler
Packaged boilers:
Select one:
a.
Are shipped in a packing case with the components disassembled
b.
Are completely factory-built
c.
Must not be used over 100 kPa working pressure
d.
Have risers and down comers
Are completely factory-built
High concentrations of dissolved solids can lead to what condition in a boiler?
a.
Foaming
b.
Carryover
c.
Surging
d.
Bubbling
Foaming
Combustion air for the burners is preheated in the _____ by hot flue gases.
Select one:
a.
Economizer
b.
Air heater
c.
Superheater
d.
Windbox
Air heater
A corrugated furnace gives required strength with thinner metal, increases heating surface and:
Select one:
a.
Increases the boiler mass
b.
Adds to the overall material cost of the unit
c.
Decreases combustion turbulence
d.
Allows for differential expansion and contraction
Allows for differential expansion and contraction
Immersion boiler tube bundles:
Select one:
a.
Conduct current through the boiler water
b.
Can be easily removed from the unit for maintenance purposes
c.
Withstand extremely high temperatures and pressures
d.
Have negligible electrical resistance
Can be easily removed from the unit for maintenance purposes
Corrugated furnaces:
Select one:
a.
Permit expansion and contraction with reduced stress
b.
Are cheaper than plain furnaces
c.
Are made from rolled copper
d.
Require fewer stays than plain furnaces
Permit expansion and contraction with reduced stress
What type of furnace is surrounded by brickwork rather than by water?
Select one:
a.
Externally fired
b.
Cyclone furnace
c.
Staged combustion furnace
d.
Internally fired
Externally fired
Tubes for high pressure service are usually:
Select one:
a.
Resistance welded construction
b.
Seamless construction
c.
Lap welded construction
d.
Fin-tube designs
Seamless construction
A reason for preferring copper tubing in a tubular boiler is:
Select one:
a.
Low cost
b.
High metal expansion rate
c.
Ease of replacement of the tubes
d.
Corrosion resistance
Corrosion resistance
In a low-pressure serpentine watertube boiler, the tubes are attached by either _______ or by using ferrules.
Select one:
a.
Welding
b.
Expanding
c.
Threading
d.
Seamless fittings
Threading
One or more steel plates rolled into a cylinder welded together with the ends closed by rounded heads, is called a:
Select one:
a.
Combustion chamber
b.
Packaged boiler
c.
Steam or water drum
d.
Steam header
Steam or water drum
The purpose of a superheater is to:
Select one:
a.
Produce high pressure steam
b.
Increase the steam output
c.
Increase the temperature of the steam
d.
Control the pressure of the steam
Increase the temperature of the steam
Later model HRTs with welded shells could produce up to how much steam?
a.
500 kg/h, 7000 kPa
b.
7000 kg/h, 500 kPa
c.
500 kg/h, 1700 kPa
d.
7000 kg/h, 1700 kPa
Feedback
7000 kg/h, 1700 kPa
Where is watertube boiler feedwater piped to?
a.
Mud drum
b.
Steam drum
c.
Downcomers
d.
Risers
Steam drum
One advantage of cast iron boilers is:
Select one:
a.
Their high factor of brittleness
b.
Reduced vibration due to their heavy foundations
c.
Unlimited operating pressures
d.
Resistance to corrosion
Resistance to corrosion
What is the name for a locomotive boiler with a water leg that extends only down the sides?
a.
Internally fired
b.
Water box
c.
Wet bottom
d.
Dry bottom
Dry bottom
The largest packaged watertube boilers available are around what size?
a.
37 000 kW
b.
72 000 kW
c.
73 000 kW
d.
27 000 kW
73 000 kW
What determines the capacity of a coil tube boiler?
a.
Number of bends
b.
Arrangement of the coils
c.
Number of tubes and overall length of tubes
d.
Size of the drum
Number of tubes and overall length of tubes
The output of an immersion type electric boiler is controlled by __________ one or more elements as required.
Select one:
a.
turning the power on or off
b.
immersing
c.
short-circuiting
d.
controlling the basket level of
turning the power on or off
A _____ is a water filled section, which surrounds the firebox in a locomotive boiler.
Select one:
a.
Crown sheet
b.
Boiler drum
c.
Steam dome
d.
Water leg
Water leg
Boiler manholes are openings through which a person can:
Select one:
a.
Enter the boiler furnace
b.
Inspect the boiler uptake
c.
Inspect, maintain or repair internal parts of a boiler
d.
Enter and inspect the steam header
Inspect, maintain or repair internal parts of a boiler
When hot combustion gases travel through boiler tubes, which are surrounded by the boiler water, the boiler is called a:
Select one:
a.
Watertube boiler
b.
Tubular boiler
c.
Coil type boiler
d.
Firetube boiler
Firetube boiler
A firetube boiler is one that has:
Select one:
a.
Water on the inside of the tubes and hot gas on the outside
b.
The furnace as the first pass of the burner flame
c.
Water on the outside of the tubes and hot water on the inside of the tubes
d.
Water on the outside of the tubes and hot gas on the inside of the tubes
Water on the outside of the tubes and hot gas on the inside of the tubes
A pressure gauge on an ASME section IV steam boiler:
Select one:
a.
Graduated to a maximum setting or double the MAWP
b.
Graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa)
c.
Graduated to a maximum setting of double the PRV setting
d.
Graduated to between 1.5 and 2 times the PRV setting
Graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa)
Bent tube watertube boilers:
Select one:
a.
Cannot have the furnace water-lined
b.
Furnaces are lined with watertubes to absorb more radiant heat from the fire
c.
Are externally fired
d.
Cannot be fitted with heat recovery components
Furnaces are lined with watertubes to absorb more radiant heat from the fire
A cyclone separator in a boiler steam drum:
Select one:
a.
Removes moisture from steam, using centrifugal force
b.
Causes impurities to be thrown from the boiler water
c.
Is located at the superheater outlet
d.
Discharges water into the scrubbers
Removes moisture from steam, using centrifugal force
A characteristic that made early boilers very inefficient was:
Select one:
a.
Small heating surface
b.
An excess of flat surfaces
c.
The internal furnace
d.
Lack of good quality fuels
Small heating surface
The continuous blowdown pipe on a boiler is used to:
Select one:
a.
Blow down the boiler if the pressure exceeds the maximum allowable working pressure
b.
Remove suspended matter from the boiler
c.
Blow chemicals into the steam drum
d.
Remove concentrated dissolved solids from the boiler
Remove concentrated dissolved solids from the boiler
An advantage of a packaged, low-pressure tubular or watertube boiler is:
Select one:
a.
Its ability to meet load changes due to its heat reserve
b.
Its less critical water treatment requirement
c.
Its lower initial cost
d.
Safety due to the low potential energy of the water contained within them
Feedback
Safety due to the low potential energy of the water contained within them
Manholes are:
Select one:
a.
Installed on all boilers
b.
Provided for inspection purposes
c.
Always circular in shape
d.
Installed on fossil fired boilers only
Provided for inspection purposes
The extended surfaces on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:
Select one:
a.
Heating surface area
b.
Steam space
c.
Water space
d.
Water circulation
Heating surface area
An internally fired boiler:
Select one:
a.
Is less efficient than an externally fired unit
b.
Utilizes a high amount of refractory and/or firebrick
c.
Has the furnace surrounded by water
d.
Requires a setting
Has the furnace surrounded by water
In 1856, Stephen Wilcox patented a boiler considered to be the first _____________ design.
a.
Firetube
b.
Internal furnace
c.
External furnace
d.
Watertube
Watertube
Beading the tube ends in a firetube boiler:
Select one:
a.
stops tube leakage
b.
eliminates the need to expand the tubes into the tubesheet
c.
helps prevent overheating of the tube ends
d.
must be followed by seal welding
helps prevent overheating of the tube ends
Why does an electrode boiler not need a low water cut-off?
a.
The current in the electrodes ensures the water level is high enough
b.
Water is conductive
c.
There is no possibility of low water level
d.
The current flow stops if the water level drops below the electrodes
The current flow stops if the water level drops below the electrodes
Chemicals are introduced into the boiler:
Select one:
a.
In the mud drum
b.
By the internal feedwater pipe
c.
In the injection tank
d.
By the dry pipes
By the internal feedwater pipe
Internal furnaces are:
Select one:
a.
Mostly used to superheat the steam
b.
Contained within the windbox of a boiler
c.
Used to increase the strength of the drum
d.
Surrounded by water
Surrounded by water
On older boilers, the masonry work that surrounded the furnace was termed:
Select one:
a.
The boiler firebox
b.
Masonry
c.
The boiler setting
d.
The boiler casing
The boiler setting
A _____________is a basic steam separator attached to the steam outlet within the steam drum.
a.
Wet pipe
b.
Dry pipe
c.
Cyclone separator
d.
Centrifugal separator
Feedback
Dry pipe
A hot water boiler is considered a high temperature water boiler when:
Select one:
a.
its design pressure is less than 1100 kPa
b.
its operating temperature is greater than 120°C
c.
its operating temperature is less than 120°C
d.
its energy input exceeds 58.7 kW
its operating temperature is greater than 120°C
A flexible watertube heating boiler has several exaggerated bends in the water tubes. Which statement applies to the bends in the water tubes?
a.
They increase the heating surface
b.
They are not designed for simple replacement
c.
They create excessive stress
d.
They restrict the tubes to expand and contract
They increase the heating surface
What is one advantage of an electric boiler?
a.
Can be installed or replaced quickly and easily
b.
Is fail-safe
c.
Can be operated at high pressures and temperatures
d.
Produces superheated steam
Can be installed or replaced quickly and easily
Which of the following is a single pass boiler?
Select one:
a.
HRT
b.
Scotch marine
c.
Packaged firetube
d.
Vertical firetube
Vertical firetube
A disadvantage of a cast iron boiler is:
Select one:
a.
It is subject to corrosion
b.
Its difficult assembly
c.
Its extremely high cost
d.
They are prone to leaks in-between the sections
They are prone to leaks in-between the sections
The steam space of a boiler must be large enough to:
Select one:
a.
Keep the steam pressure down
b.
Reduce the cooling effect of water
c.
Allow the steam to rise from the surface of the water
d.
Accommodate all the steam riser tubes
Feedback
Allow the steam to rise from the surface of the water
Firetube boilers have which two distinct advantages over watertube boilers of a comparable rating?
a.
They contain more water and are quick to respond to load changes without losing a lot of pressure
b.
They contain less water and are slow to respond to load changes without losing a lot of pressure
c.
They contain more water and are slow to respond to load changes without losing a lot of pressure
d.
They contain less water and are quick to respond to load changes without losing a lot of pressure
They contain more water and are quick to respond to load changes without losing a lot of pressure
An advantage of an electric boiler is that it:
Select one:
a.
Is fail-safe
b.
Can be operated at high pressures and temperatures
c.
Produces superheated steam
d.
Has a high efficiency of energy transfer from the electricity to the boiler water
Has a high efficiency of energy transfer from the electricity to the boiler water
Bent watertubes surround the furnace, thus absorbing more _____________.
a.
Heat transfer
b.
Conduction heat
c.
Convection heat
d.
Radiant heat
Radiant heat
What is the saturation temperature of water at 100 kPag?
Select one:
a.
125C
b.
100C
c.
120C
d.
117C
120C
A water leg is found on a/an ____________ boiler.
Select one:
a.
Scotch
b.
Watertube
c.
Locomotive
d.
HRT
Locomotive
The boiler MAWP determines:
Select one:
a.
The type of burner
b.
The strength of the drum or shell
c.
The capacity of the PRV
d.
The length of the tubes
The strength of the drum or shell
The steam and water spaces of a cast iron sectional boiler are connected by:
Select one:
a.
Tie rods
b.
Tie nipples
c.
Hydraulic jacks
d.
Push nipples or gaskets
Push nipples or gaskets
In Alberta, Power Engineers are required to operate:
Select one:
a.
Section I boilers of all sizes, and all steam section IV boilers, but not section IV hot water boilers
b.
Section I boilers over 20 kW, and section IV boilers over 750 kW
c.
Section I boilers over 750 kW, and section IV boilers over 1000 kW
d.
Section I boilers of all sizes, and section IV steam boilers over 20 kW, and no section IV hot water boilers
Section I boilers over 20 kW, and section IV boilers over 750 kW
A force that holds the manway doors of the boiler drums in place during operation is the:
Select one:
a.
bolting force
b.
force on the yoke
c.
boiler pressure
d.
strength of the welds
boiler pressure
Which of the following is NOT an advantage of an electric boiler over other boilers?
Select one:
a.
More efficient
b.
Does not need water treatment
c.
Very compact
d.
Quiet operation
Does not need water treatment
The two general designs of electric boilers are the:
Select one:
a.
Firetube and watertube
b.
AC and DC
c.
Electrode and immersion
d.
Grounded and ungrounded
Electrode and immersion
The heating surface of a boiler consists of all parts that:
Select one:
a.
Have water on one side and steam on the other side
b.
Have steam on one side and hot gases on the other side
c.
Have water on one side and hot gases on the other side
d.
Are exposed to hot gases
Have water on one side and hot gases on the other side
An advantage of a vertical tubeless firetube boiler is that it requires:
Select one:
a.
Relatively small floor space
b.
No fuel handling equipment
c.
Less fuel for combustion
d.
Very little water treatment
Relatively small floor space
In a boiler, all steam generating parts that are exposed to fire or hot gases must be:
Select one:
a.
Made of fire brick
b.
Covered by water
c.
Fitted with expansion joints
d.
Covered with ceramic tile
Covered by water
The water flow through a modular cast iron boiler system:
Select one:
a.
Continuous through all modules
b.
Connected in series
c.
Intermittent, occurring only while the unit is firing
d.
Done without the use of headers or manifolds
Continuous through all modules
The electrode type boiler:
Select one:
a.
Requires a steady load
b.
Must operate at very constant pressure
c.
Utilizes bundles of electric elements
d.
Requires water that conducts electricity
Requires water that conducts electricity
An immersion electric boiler can have capacity as high as ___________ kW.
Select one:
a.
1500
b.
2100
c.
30 000
d.
16 000
1500
The passage of combustion gases along the length of the boiler is referred to as a:
Select one:
a.
Stack pass
b.
Combustion gas pass
c.
Combustion air pass
d.
Chimney pass
Combustion gas pass
What is the capacity of an immersion electric boiler limited to?
a.
Places where electricity is cheap
b.
1000 kW and 2100 kPa
c.
Lower capacity and pressure
d.
Situations of only high process steam demand
Feedback
Lower capacity and pressure
The Haycock boiler was:
Select one:
a.
A watertube design
b.
A return tubular design
c.
Used around 1720
d.
Of welded construction
Used around 1720
In a cast-iron boiler, what are the passageways between the steam and water sections sealed with?
a.
Tie-rods
b.
Hydraulic jacks
c.
Steel studs
d.
Push-nipples
Push-nipples
How many passes does this firetube boiler have? The shaded areas indicate a pass.
4
Firetube boilers have their tubes fixed into flat steel plates, known as:
Select one:
a.
Shells
b.
Drums
c.
Headers
d.
Tube sheets
Tube sheets
Surfaces that require staying in a firetube boiler are
Select one:
a.
ellipsoidal
b.
curved
c.
flat
d.
not covered in water
flat
Which of the following is true for an immersion boiler?
a.
It requires water that conducts electricity
b.
A low water cut-off is not necessary
c.
The steam produced depends on the level of the water in the basket
d.
No electric current travels through the water
No electric current travels through the water
As per ASME section I and section IV, a steam boiler operating at a pressure of ______ or higher is considered a Power Boiler
Select one:
a.
15 psig / 100 kPa
b.
14.7 psig / 101.3 kPa
c.
14.7 psig / 100 kPa
d.
15 psig / 103.1 kPa
15 psig / 100 kPa
In a cast iron modular heating boiler, the operation of the burner of each module is controlled by a _____ that starts or stops modules in sequence as load demand increases or decreases.
Select one:
a.
Temperature sensor
b.
Step controller
c.
Thermostat
d.
Flow controller
Step controller
Boiler handholes are openings that are use to:
Select one:
a.
Enter and inspect the boiler furnace
b.
Inspect the boiler uptake
c.
Inspect the boiler shell or drum
d.
Inspect the windbox
Inspect the boiler shell or drum
A membrane water wall:
Select one:
a.
Consists of a metal sheeting in front of the tubes
b.
Has metal plates welded between the tubes
c.
Has firebrick in front of the tubes
d.
Has waterproof membranes lining the tubes
Has metal plates welded between the tubes
The sections of a cast iron sectional boiler are held together by:
Select one:
a.
Cast iron pipes
b.
Steel studs
c.
Tie rods
d.
Stay bolts
Tie rods
Cast iron boiler capacity:
Select one:
a.
Is very large compared to steel boilers
b.
Can be increased by simply adding sections
c.
Cannot be increased once assembly is completed
d.
Can be increased by increasing section size
Can be increased by simply adding sections
In a vertical sectional boiler, the sections are placed:
Select one:
a.
One above the other
b.
Side by side
c.
On the furnace
d.
Above the draft hood
Side by side
Tube stubs, which are used to connect fittings and attachments to drums and headers, are known as:
Select one:
a.
Fittings
b.
Manifolds
c.
Nozzles
d.
Flanges
Nozzles
What is a boiler MAWP used to calculate?
a.
Size of the steam drum
b.
Thickness of various components of the boiler
c.
Design pressure of the material of construction
d.
Diameter of the boiler tubes
Thickness of various components of the boiler
One advantage of the low-pressure flexible watertube boiler is that:
Select one:
a.
No maintenance is required
b.
Feedwater treatment is unnecessary
c.
Expansion and contraction stresses are eliminated
d.
Tubes never need replacement
Expansion and contraction stresses are eliminated
What is one disadvantage of an electric boiler?
a.
Is inefficient
b.
Has no chimney
c.
Electricity is usually much more expensive than fossil fuels
d.
Requires alternating current
Electricity is usually much more expensive than fossil fuels
In a modular heating boiler plant, how are the boilers connected?
a.
Using tie-rods to hold them together
b.
In parallel between the supply and return header
c.
In series between the supply and return header
d.
Side by side like slices in a loaf of bread
In parallel between the supply and return header
What is a once-through steam generator with no drums called?
a.
Firetube flood boiler
b.
Watertube flood boiler
c.
Firetube boiler
d.
Watertube boiler
Watertube boiler
To prevent flue gas leakage from the furnace of a packaged watertube boiler:
Select one:
a.
An induced draft fan is incorporated
b.
Smoke stacks are made taller
c.
An economizer is used
d.
A steel casing forms a seal for the furnace
A steel casing forms a seal for the furnace
Packaged firetube boilers can be purchased in sizes ranging from just a few kilowatts up to how many kilowatts?
a.
25 000 kW
b.
15 000 kW
c.
35 000 kW
d.
52 000 kW
25 000 kW
Handhole and manhole openings:
Select one:
a.
Permit inspection, cleaning and repairs
b.
Require a cast iron reinforcing ring
c.
Are not required on low pressure hot water boilers
d.
Are required on high pressure boilers only
Permit inspection, cleaning and repairs
Air heaters are implemented in steam generating units in order to:
Select one:
a.
Improve combustion efficiency
b.
Keep the boiler house warm
c.
Prevent utility boilers from freezing during winter outages
d.
Produce dryer steam
Improve combustion efficiency
A watertube boiler is a boiler in which:
Select one:
a.
Water passes through the tubes
b.
Air passes through the tubes
c.
Water passes around the tubes
d.
Combustion gases pass through the tubes
Water passes through the tubes
The furnace walls in a bent-tube watertube boiler are formed by water filled tubes, called:
Select one:
a.
Furnace walls
b.
Waterwalls
c.
Fireside walls
d.
Waterside walls
Waterwalls
The internal feedwater pipe extends through most of the length of which component?
a.
Downcomer
b.
Risers
c.
Steam drum
d.
Mud drum
Steam drum
For the same kilojoule relief capacity, what size should the heating boiler safety valve (pressure relief valve) be?
a.
Similar to a power boiler safety valve
b.
Smaller than a power boiler safety valve
c.
Larger than a power boiler safety valve
d.
Half the size of a power boiler safety valve
Larger than a power boiler safety valve
A packaged watertube boiler having two mud drums is the:
Select one:
a.
“O” type
b.
“D” type
c.
Three drum bent-tube type
d.
“A” type
“A” type
In a bottom-supported boiler, the steam drum is usually:
Select one:
a.
Supported by an overhead girder arrangement
b.
Supported by the water tubes
c.
Supported by piers
d.
Placed between the centre line of the unit
Supported by the water tubes
The distribution pipe that injects feedwater inside a boiler:
Select one:
a.
Must be made of at least schedule 80 pipe
b.
Is arranged to reduce thermal shock in the drum
c.
Introduces the feedwater against the radiant heating surfaces of the boiler
d.
Improves the separation of steam and water
Is arranged to reduce thermal shock in the drum
A tube expander is used to:
Select one:
a.
Break loose scale inside the tube
b.
Break loose scale outside the tube
c.
Expand and flare the tube
d.
Bead the tube
Expand and flare the tube
When part of firetube boilers, heads are commonly called what ?
Select one:
a.
Heads
b.
Tube sheets
c.
Plates
d.
End plates
Tube sheets
