Intro To Boiler Design Flashcards
Firetube boilers have which two distinct advantages over watertube boilers of a comparable rating?
a. They contain less 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 more water and are quick to respond to load changes without losing a lot of pressure
d. They contain more water and are quick to respond to load changes without losing a lot of pressure
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
b. Are completely factory-built
In a cast-iron boiler, what are the passageways between the steam and water sections sealed with?
a. Steel studs
b. Hydraulic jacks
c. Push-nipples
d. Tie-rods
c. Push-nipples
With regard to a steam boiler, the term “HRT” means:
Select one:
a. Highly regulated temperature
b. Hot return tubes
c. Horizontal return tubular
d. Horizontal receiver tubes
c. Horizontal return tubular
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
c. Expansion and contraction stresses are eliminated
Boilers are designed with more combustion gas passes:
Select one:
a. Because boiler tubes cannot be manufactured in great lengths
b. To allow more time for heat transfer
c. So soot falls out in the last pass, leaving the first pass clear
d. To create less thermal stress on the boiler metal
b. To allow more time for heat transfer
When part of firetube boilers, heads are commonly called what ?
Select one:
a. Heads
b. Tube sheets
c. Plates
d. End plates
b. Tube sheets
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
a. turning the power on or off
Boiler stays:
Select one:
a. Are used to support flat surfaces in a boiler
b. Are mostly used in watertube boilers
c. Have to be replaced every two years
d. Secure a boiler to its foundation
a. Are used to support flat surfaces in a boiler
Where is watertube boiler feedwater piped to?
a. Mud drum
b. Steam drum
c. Downcomers
d. Risers
b. Steam drum
In Alberta, Power Engineers are required to operate:
Select one:
a. Section I boilers over 750 kW, and section IV boilers over 1000 kW
b. Section I boilers of all sizes, and all steam section IV boilers, but not section IV hot water boilers
c. Section I boilers of all sizes, and section IV steam boilers over 20 kW, and no section IV hot water boilers
d. Section I boilers over 20 kW, and section IV boilers over 750 kW
d. Section I boilers over 20 kW, and section IV boilers over 750 kW
In a boiler, the continuous blowdown pipe is located:
Select one:
a. Where the purest boiler water collects
b. At the very bottom of the steam drum
c. A few inches below the top of the mud drum
d. A few inches below the water level in the steam drum
d. A few inches below the water level in the steam drum
Bottom blow-off of heating boilers may be required:
Select one:
a. only 2-3 times per year, if hard water is used
b. seasonal or semi-seasonal when limited chemical control is used
c. once or twice a year if soft water is used
d. weekly if soft water is used
c. once or twice a year if soft water is used
What is the saturation temperature of water at 100 kPag?
Select one:
a. 125C
b. 117C
c. 100C
d. 120C
d. 120C
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
d. “A” type
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
d. Remove concentrated dissolved solids from the boiler
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
d. Corrosion resistance
Bottom Blow Off valves:
_______ on Power Boilers, and _________ on heating boilers
Select one:
a. 2 are required, 2 are required
b. 2 are required, 1 is required
c. 2 are required, a drain valve only is required
d. 1 is required, 1 is required
b. 2 are required, 1 is required
The Haycock boiler was:
Select one:
a. A watertube design
b. A return tubular design
c. Used around 1720
d. Of welded construction
c. Used around 1720
Electric boilers:
Select one:
a. Are low pressure boilers only
b. Do not need gauge glasses
c. Do not need a chimney
d. Are economical to operate
c. Do not need a chimney
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
a. Improve combustion efficiency
The operating voltage for a jet-type electrode boiler may be as high as _________ kilovolts:
Select one:
a. 30
b. 25
c. 5
d. 55
b. 25
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
b. Has metal plates welded between the tubes
In what year did Thomas Newcomen develop an atmospheric pressure steam engine?
a. 1712
b. 1702
c. 1732
d. 1722
a. 1712
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
d. Surrounded by water
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
d. Requires water that conducts electricity
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
b. Side by side
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
c. helps prevent overheating of the tube ends
A water leg is found on a/an ____________ boiler.
Select one:
a. Scotch
b. Watertube
c. Locomotive
d. HRT
c. Locomotive
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
c. Tie rods
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
b. Does not need water treatment
Cast Iron is suitable for boiler construction material up to ______kPa, and fittings to a limit of _______kPa and ________C
Select one:
a. 70, 100, 230
b. 100, 1700, 230
c. 1700, 1700, 230
d. 100, 120, 120
b. 100, 1700, 230
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
d. Resistance to corrosion
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
c. Allow the steam to rise from the surface of the water
The internal feedwater pipe extends through most of the length of which component?
a. Steam drum
b. Downcomer
c. Risers
d. Mud drum
a. Steam drum
Tubes for high pressure service are usually:
Select one:
a. Resistance welded construction
b. Seamless construction
c. Lap welded construction
d. Fin-tube designs
b. Seamless construction
What is a once-through steam generator with no drums called?
a. Firetube flood boiler
b. Watertube boiler
c. Firetube boiler
d. Watertube flood boiler
b. Watertube boiler
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
a. Are mostly gas fired
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
b. Step controller
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
a. Removes moisture from steam, using centrifugal force
Which one of the following is NOT an advantage of a packaged firetube boiler?
Select one:
a. Large enough to provide steam for large-scale power generation
b. Lower purchase price because they are mass produced
c. Quality can be ensured prior to delivery
d. The boilers can be factory tested before being sent to the customer
a. Large enough to provide steam for large-scale power generation
What is a boiler MAWP used to calculate?
a. Diameter of the boiler tubes
b. Thickness of various components of the boiler
c. Design pressure of the material of construction
d. Size of the steam drum
b. Thickness of various components of the boiler
Expanding of tubes into a tube sheet is also called:
Select one:
a. Beading
b. Rolling
c. Flaring
d. Peening
b. Rolling
An immersion electric boiler can have capacity as high as ___________ kW.
Select one:
a. 1500
b. 2100
c. 30 000
d. 16 000
a. 1500
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
c. Lower capacity and pressure
A _____________is a basic steam separator attached to the steam outlet within the steam drum.
a. Cyclone separator
b. Wet pipe
c. Centrifugal separator
d. Dry pipe
d. Dry pipe
The steam produced by an electrode type boiler depends on the:
Select one:
a. Voltage supplied to the immersion elements
b. Level of water in the basket
c. Number of heating elements energized
d. Number of electrodes energized
b. Level of water in the basket
A high-pressure steam boiler is one in which steam is generated at a pressure greater than:
Select one:
a. 100 kPa
b. 101.3 kPa
c. 50 kPa
d. 75 kPa
a. 100 kPa
In a packaged firetube boiler, what are the areas that hold the steam and mud called?
a. Steam drum, mud drum
b. Steam space, shell
c. Steam drum, shell
d. Steam space, mud drum
b. Steam space, shell
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
b. Is arranged to reduce thermal shock in the drum
What is one advantage of an electric boiler?
a. Can be operated at high pressures and temperatures
b. Can be installed or replaced quickly and easily
c. Is fail-safe
d. Produces superheated steam
b. Can be installed or replaced quickly and easily
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 between 1.5 and 2 times the PRV setting
c. Graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa)
d. Graduated to a maximum setting of double the PRV setting
c. Graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa)
Which of these is not a steam drum internal component?
Select one:
a. Chemical feed pipe
b. Chevron dryer
c. Baffle
d. Intermittent blow off line
d. Intermittent blow off line
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
b. Can be easily removed from the unit for maintenance purposes
Later model HRTs with welded shells could produce up to how much steam?
a. 500 kg/h, 7000 kPa
b. 500 kg/h, 1700 kPa
c. 7000 kg/h, 500 kPa
d. 7000 kg/h, 1700 kPa
d. 7000 kg/h, 1700 kPa
Class 1 water treatment, as per ASME section VI, is suitable for:
Select one:
a. Firetube Heating Boilers
b. Watertube Heating Boilers
c. Cast Iron boilers
d. Tubular heating boilers
c. Cast Iron boilers
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
c. Threading
In 1856, Stephen Wilcox patented a boiler considered to be the first _____________ design.
a. Internal furnace
b. Watertube
c. External furnace
d. Firetube
b. Watertube
A reason for preferring copper tubing over steel or cast iron in a tubular boiler is:
Select one:
a. Greater heat transfer rate
b. Because of its good ductility
c. Its ability to withstand high temperature
d. Its lower cost than steel
a. Greater heat transfer rate
The largest packaged watertube boilers available are around what size?
a. 27 000 kW
b. 72 000 kW
c. 73 000 kW
d. 37 000 kW
c. 73 000 kW
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
d. A steel casing forms a seal for the furnace
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
c. Inspect the boiler shell or drum
