BOILERS QUESTIONS FILL IN THE BLANKS / ANSWER
Where is a fusible plug installed on a Scotch or auxiliary boiler?/At or near the center of the crown sheet of the combustion chamber.
Fusible plugs are installed in fire-tube boilers to _____________./warn the engineer of low water level
If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition after a normal shutdown, you should check for a/an __________./faulty photocell detector
Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always _____________./close all manually operated fuel valves
Generating tubes in waste heat boilers are finned to ____________./increase the rate of heat transfer
If an operating auxiliary boiler has a water pH reading of 7, you should ______________./treat the water with caustic soda
Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in an auxiliary boiler?/Expansion of the steam in the furnace.
A failure to any component of a flame safeguard control for an automatically fired auxiliary boiler, will result in ______________./the prevention of automatic restart
When an auxiliary boiler is on the line, the output of the flame scanner can be checked by placing a microammeter in series with the photoelectric cell circuit. The readings on high fire should be ____________./higher than those at low fire
A feed pump for an auxiliary boiler might lose suction if the ____________./feedwater is too hot
The water in a steaming auxiliary boiler should be tested daily for ______________./chlorides
The programmed control system of an automatic auxiliary boiler will terminate the light off process during the prepurge period if air flow is not sensed and _________./the damper is not sufficiently open
The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high ____________./steam pressure
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to _________________./reduce corrosion in the heating coil
Coast Guard Regulations (46 CFR) require the controls for automatically fired auxiliary boilers, must be fitted with visible indicators to signal __________./fuel oil shutoff due to flameout
When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used ____________./at low loads to prevent corrosion in the boiler
How is the concentration of dissolved oxygen in the feedwater of an auxiliary boiler maintained at acceptable limits?/Oxygen is liberated by maintaining the highest practical feedwater temperature.
Which of the listed types of control systems is required by Coast Guard Regulations (46 CFR) for large automatic auxiliary boiler heating equipment?/All of the above
Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer?/Control of evaporation
When it becomes necessary to replace any tubes in a water-tube auxiliary boiler to eliminate leaks at the tube seats, the replacement tubes should be ____________./rolled, beaded, and seal welded around the bead edge
Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on in response to ____________./low steam pressure
It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to __________./prevent wire drawing of the disc and seat
Coast Guard Regulation (46 CFR) requires that after undergoing extensive repairs, an auxiliary boiler, with a maximum allowable working pressure of 60 psig (411.89 kPa), should be hydrostatically tested at a pressure of ______________./90 psig (617.83 kPa)
The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to _______________./remove explosive vapors from the furnace
An auxiliary boiler equipped with a return flow fuel atomization system, has a _____________./variable fuel return pressure
Heavy soot accumulations in an auxiliary boiler could be caused by _____________./improper burner maintenance
Prior to lighting off a cold automatically fired auxiliary boiler, you should _____________./check and regulate the water level
Within the cycle of a forced circulation auxiliary water-tube boiler, part of the water flashes into steam, and the remaining hot water is _________________./collected in the lower portion of the steam accumulator for recirculation back to the heating coil or water tank
Ignition failure in an automatically controlled auxiliary boiler could be caused by _____________./carbon deposits on the flame scanner
In a coil-type auxiliary water-tube circulation boiler _____________./unevaporated feedwater collects in the bottom of the flash chamber
A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by ____________./an unevenly shaped burner flame
Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?/The high limit control secures power to the entire oil firing system.
Throttling a burner air register on an auxiliary boiler could result in ____________./smoky boiler operation
A burner producing black smoke in an automatic auxiliary boiler, would be caused by a/an ______________./incorrect primary air setting
Which of the following actions should be taken when an auxiliary boiler is operation?/Inspect for oil and water leaks.
Failure of the burner flame in an automatic auxiliary boiler would probably be a result of ______________./water in the fuel oil
If the flame of an automatically fired auxiliary boiler tends to move away from the burner tip when the firing rate is changed from low to high, you should ____________./adjust damper linkage to slow the opening rate of the dampers
Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?/Bottom blowing
If the fire goes out in an automatically fired auxiliary boiler and the burner continues to supply fuel, there is a potential danger of ______________./a severe furnace explosion
Improper maintenance of an automatic auxiliary boiler oil burner could result in ______________./decreased boiler efficiency
In accordance with Coast Guard Regulations (46 CFR), water level controls utilized in a small automatically fired auxiliary heating boiler, shall be tested ______________./slowly by lowering the boiler water level
After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the ________________./furnace to be repurged
When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil ____________./back to the suction side of the service pump
Which of the following conditions will cause only one of the burner solenoid valves to close on an automatically fired, two burner unit, auxiliary boiler?/A faulty coil in one of the solenoid valves
The burner assembly on an automatically fired auxiliary boiler fitted with variable capacity, pressure atomizing burners, maintains steam pressure by ______________./changing fuel oil return pressure
While an auxiliary boiler is operating at design load, which of the following actions will occur if the automatic combustion control system detects a steam pressure drop?/The fuel oil valve and air damper will open wider.
According to Coast Guard Regulations (46 CFR), when an automatically fired boiler has a flameout, which of the following actions should occur FIRST?/The fuel valve should be de-energized.
The water in an auxiliary boiler should be chemically tested daily for alkalinity and _________________./chloride content
The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent ____________./explosions in the boiler furnace
The purpose of designing some waste heat boilers with sinuous fire tubes, is to ____________./increase the rate of heat transfer to the waterside
The amount of chloride content in the water of an auxiliary boiler can be reduced by ____________./blowing down the boiler
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______________./water level is abnormally low
In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?/The boiler vent valves should be opened.
Constant capacity pressure atomizing fuel oil burners installed on automatically fired auxiliary boilers, respond to variations in load demand by ____________./automatically cycling the burner on and off
Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?/Excessive feedwater temperature
Coast Guard Regulations (46 CFR) specify that the fuel oil ignition system, on a small automatically fired auxiliary boiler, shall be energized ____________./only before, or simultaneously with, the opening of the fuel oil valve
The amount of oil atomized by the return flow variable capacity atomizer, used with some automatically fired boilers, is controlled by the _______________./oil pressure in the oil return line
An automatically fired auxiliary boiler is required by Coast Guard Regulations (46 CFR) to be shutdown as a result of ____________./low water level
Fins are installed on the generating tube surfaces in waste heat boilers to ____________./increase the rate of heat transfer
Subtracting the return flow meter reading from the supply flow meter reading on a boiler equipped with a return flow fuel oil system, determines the amount of oil ____________./burner throughput
In a fire-tube auxiliary boiler, you should expect to find the thickest scale on the waterside of the ____________./crown sheet
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ____________./abnormally high feedwater temperature
When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?/Water in the fuel oil
Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?/Inspect for oil or water leaks.
When there is a flame failure in an automatically fired auxiliary boiler, the ____________./fuel supply is shut off
Excessive vibration of an automatically fired auxiliary boiler can be caused by _____________./combustion pulses
Burner ignition failure in an automatically fired auxiliary boiler would be caused by ____________./a burned out solenoid in the oil supply valve
The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner _______________./in the event of a flame failure
The water in an auxiliary boiler should be tested for chloride content to determine ______________./salt contamination
According to Coast Guard Regulations (46 CFR), the fuel strainer installation located in the supply lines to the fuel pump of an auxiliary boiler, can be provided with _________./all of the above
Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an automatic auxiliary boiler, will cause ____________./burner smoking
The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of __________./seawater contamination
Automatic burner shutdown in an auxiliary boiler, as a result of a component failure in the flame safeguard controls, will _______________./prevent the boiler from automatically relighting
When an auxiliary boiler is secured and you expect to relight the unit within six hours, you should _____________./maintain a head of steam not less than 10 psig
If the combustion control system of an automatically fired auxiliary boiler fails to restart from the normal shutdown mode, you should check for ______________./all of the above
Bottom blow valves are installed on auxiliary water-tube boilers to _____________./remove suspended and precipitated solids from the boiler water
The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each __________./day
Coast Guard Regulations (46 CFR) require that the flame safeguard control system for an automatic boiler, should _____________./be capable of closing the fuel valves in not more than 4 seconds after a flame failure
Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in a auxiliary boiler return flow fuel oil system?/Through tangential slots in the sprayer plate.
For proper operation, auxiliary boiler feedwater must have which of the following characteristics?/Proper alkalinity
The most common cause of scale formation in an auxiliary boiler is ______________./concentrations of calcium sulfate in the boiler water
Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of ____________./10
Which of the following statements concerning automatically controlled auxiliary boiler system alarms complies with applicable Coast Guard Regulations (46 CFR)?/Visible indicators require manual resetting.
Excessive alkalinity of the water in an auxiliary boiler can cause ____________./caustic embrittlement of the boiler metal
Two solenoid control valves are required on large automatic auxiliary boilers, and will simultaneously shut off the fuel in the event of _______________./low water
Diesel engine waste heat boiler construction is usually of the fire-tube or _____________./water-tube type
The procedures recommended for auxiliary boilers having high salinity include ____________./securing the boiler and giving it a bottom blow
The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by ______________./high steam pressure
In the event of a flame failure in an auxiliary water-tube boiler, you must ______________./purge the furnace of any combustible gases before attempting to relight the fire
Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in ____________./increased fuel consumption
The concentration of dissolved solids in the boiler water of an auxiliary boiler could increase as a result of ___________./phosphate treatment
Failure of the feed pump to deliver feedwater to an auxiliary boiler could be caused by _______________./grounded probes in the water level control
Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?/To ensure that the valve will not be seized shut when hot.
Flame failure in an automatically fired auxiliary boiler can result from a/an ______________./clogged fuel nozzle
If the fuel/air ratio in an automatically fired auxiliary boiler is insufficient, the result could lead to __________./all of the above
Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?/Observe general boiler performance
Under which of the following conditions must the combustion control system for a small automatic auxiliary boiler secure the burner?/Flame failure
A pulsating flame, accompanied by a burner developing black smoke in an auxiliary boiler, is an indication that the _____________./fuel oil pressure is too low
Which of the following actions should normally be taken during each watch when the auxiliary boiler is operation?/Blow down the water gage glass
Flame failure in an operating automatically fired auxiliary boiler can result from a _____________./clogged fuel nozzle
A failure of any component of a flame safeguard control for an auxiliary boiler will result in ____________./automatic burner shutdown
The daily inspection of an operating auxiliary boiler should include ____________./checking for external fuel and water leaks
If a tube ruptures in a water-tube auxiliary boiler due to low water, you should ____________./secure both the fires and the feed inlet valve
An automatically fired auxiliary boiler with carbon deposits formed on its burner electrodes, will experience _________./ignition failure
An exhaust gas bypass is installed on a waste heat boiler in order to ____________./minimize moisture condensation in the boiler gas passages at low loads
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler _____________./burner flame is extinguished
The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to ____________./prevent boiler corrosion at low engine loads
Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium ____________./sulfite or hydrazine
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ____________./corrosion at low engine loads
The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ___________./seawater contamination
Which of the listed sequence of events occurs when an automatic auxiliary boiler is prepurged?/The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position.
High stack temperature occurring in an auxiliary boiler could be a result of ____________./secondary combustion in the uptake
A firebox explosion in an automatically fired auxiliary boiler may be the result of ______________./insufficient purging before lighting off
The PRIMARY function of a waste heat boiler is to _________./recover heat which otherwise would be lost
A coil-type automatically fired auxiliary boiler is to be laid up wet for an indefinite period. The boiler water should be treated to ensure that ____________./the manufacturer's recommended pH is maintained
Coast Guard Regulations (46 CFR) require all automatically fired low pressure heating boilers to have an automatic ____________./fuel cutoff as a result of low water
Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a ___________./steam pressure sensing device with linkage to the damper air vanes
A safety valve on an auxiliary boiler simmers constantly and can not be stopped by several quick blow-offs using the hand relieving gear. The problem may be __________./a damaged seat
A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a __________./dirty fuel nozzle
Which of the following types of feedwater regulators is commonly used with a water-tube, natural circulation, auxiliary boiler?/Thermo mechanical
A SECONDARY function of a waste heat boiler is to _________./reduce engine exhaust noise
An auxiliary boiler is equipped with a return flow fuel atomization system, which uses a/an _____________./constant fuel supply pressure
Overfiring of a hot water boiler may be caused by _________./faulty limit controls
The pressuretrol is installed on an auxiliary boiler to sense steam pressure changes, it _______________./automatically regulates the quantity of oil and air flow to the burner
If the combustion control system of an automatically fired auxiliary boiler fails to relight the burner after a normal shutdown, you should check for a/an ____________./faulty photocell detector
A waste heat boiler is installed on some diesel propelled vessels to _____________./provide steam for the turbogenerator
Why should handhole gaskets not be allowed to leak on an auxiliary boiler?/The gasket and its seating surface may become wire drawn.
Automatic combustion control systems for auxiliary boilers are designed to cycle burners on and off in response to the _______________./steam pressure
The variation in the amount of fuel oil burned in the operation of an auxiliary boiler, utilizing a return flow type atomization system, is a function of the _____________./fuel oil back pressure
Which of the following conditions could cause black smoke to be discharged from the stack of an auxiliary boiler equipped with turbine-driven rotary cup atomizers?/Improper turbine shaft speed in the atomizer assembly.
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ____________./gas temperature
Which of the listed parts on a fire-tube auxiliary boiler requires a written report to the Officer-in-Charge of Marine Inspection when renewed?/Fusible plugs
Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on and off in response to ____________./steam pressure
Waterside scale in a fire-tube boiler may cause ___________./overheated tubes
When an auxiliary boiler is panting and emitting black smoke, you should _____________./increase the air supply
Bottom blow valves are installed on auxiliary water-tube boilers to _____________./remove settled solids from the water drum
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin _____________./when the boiler has been secured long enough for most solids to settle
With which of the following types of diesel engine arrangements is a waste heat boiler most likely to produce the maximum steam pressure, temperature, and flow conditions?/Supercharged, four-stroke/cycle diesel engine
During maintenance inspections of a fire tube auxiliary boiler, you should check for _____________./all of the above
The constant capacity, pressure atomizing, fuel oil burners designed to meet a wide variation in the steaming loads of an auxiliary boiler, are ________________./automatically cycled on and off in response to demand
Coast Guard Regulations (46 CFR) permit tubular type water gage glasses on auxiliary boilers, provided the maximum allowable working pressure does not exceed ________./250 psi
In an automatically fired auxiliary boiler, restarting from the normal shutdown cycle in response to steam demand, is initiated by a/an ______________./pressuretrol measuring only the steam pressure
Which of the following methods is typically employed in the design of waste heat boilers to obtain maximum heat transfer, while maintaining low overall weight?/Steel fins are installed on the generating tube surfaces to increase the effective surface area.
According to Coast Guard Regulations (46 CFR), which of the following pressures is the highest boiler pressure where a tubular type gage glass may be installed?/250 psig
At the beginning of the prepurge period on an automatic auxiliary boiler equipped with a programmed control system, the unit will not restart if airflow is not sensed and ______________./the damper is not sufficiently opened
A properly adjusted safety valve for an auxiliary boiler will ____________./open with a sharp, clear pop at its set pressure
When conducting a hydrostatic test on a water-tube auxiliary boiler, the test water should be heated to a temperature of at least 70°F. This is done to ____________./help prevent the formation of condensation on the tube exteriors
A photoelectric cell installed in an automatically fired auxiliary boiler burner management system ________________./opens the burner circuit upon sensing a flame failure
The maximum allowable working pressure on a packaged auxiliary boiler is 200 psig. The normal working pressure for one particular packaged boiler is 175 psig. Which of the following safety relief valve settings would be proper for this boiler?/195 psig
Coast Guard Regulations (46 CFR) require that oil fired automatic steam boilers, and hot water boilers shall be equipped with a prepurge programming control that will assure at least ______________./4 air changes
A smoking burner with a pulsating flame in an auxiliary boiler, is an indication that the ______________./fuel/air ratio is incorrect
On an automatically fired auxiliary boiler, the steam pressure limit switch is wired into the burner electric circuit to ______________./shut off the burner when the cutoff pressure is reached
Excessive vibration from an auxiliary boiler could be caused by ____________./all of the above
After lighting off a cold, automatically fired, auxiliary boiler, as steam begins to form, you should ___________./close the air cock
In a coil-type forced circulation auxiliary water-tube boiler _____________./hot water flashes to steam in the flash chamber
If poor combustion occurs in an auxiliary boiler due to an air damper linkage being out of adjustment, you would adjust the linkage and then _____________./check the photocell window for carbon deposits
Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?/Low water level cutoff switch
Which of the following conditions would cause "panting" in a steaming auxiliary boiler?/Insufficient combustion air
Which of the following statements concerning the operation of a coil-type forced circulation auxiliary water-tube boiler is correct?/Unevaporated boiler water collects in the bottom of the accumulator.
Coast Guard Regulations (46 CFR) require electric hot water supply boilers to be provided with a/an _____________./temperature limiting device
In a forced circulation auxiliary boiler, steam is formed in the ____________./steam accumulator (flash chamber)
Ignition failure in an automatically controlled auxiliary boiler can be caused by ______________./carbon deposits on the electrode
A sudden flame failure in an operating auxiliary boiler, equipped with an automatic combustion control system and burning light fuel, could be attributed to a______________./loose connection on the photocell
The flame safeguard controls of a large automatically fired auxiliary boiler, may consist of a ____________./photoelectric cell
Coast Guard Regulations (46 CFR) permit the use of which of the following fuel oil ignition methods on automatic auxiliary boilers?/Light oil pilot
Which of the following statements concerning fire-tube boilers is correct?/Combustion gases flow through the tubes.
Which of the following statements about a coil-type forced circulation auxiliary water-tube boiler is correct?/Response to steam demand is comparatively rapid.
Ignition failure in an auxiliary boiler can be caused by _____________./carbon deposits on electrodes
The purpose of the safety relief valves installed on an auxiliary boiler is to ____________./reduce excess steam pressure in the boiler
The safety valve installed on a coil-type auxiliary boiler is located on the ____________./flash chamber
Which of the following statements is true concerning pressure limit switches and pressuretrols installed on auxiliary boilers?/They consist of a bellows assembly, linked with a snap action switch, through a pressure adjusting mechanism.
The purpose of try-cocks used on an auxiliary boiler is to ____________./provide an alternate means of determining the water level, if the gage glass fails
The gage glass on a coil-type auxiliary boiler is connected to the ______________./accumulator
When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will _________./increase the fuel oil control valve opening
Automatically fired auxiliary boilers use fuel oil strainer arrangements of either the simplex type or _____________./duplex type
In an auxiliary boiler steam and water system, the highest pressure will be in the ____________./feedwater system
The fuel oil strainers in the fuel oil service system of an automatically fired auxiliary boiler are permitted by the Coast Guard Regulations (46 CFR) to be either the simplex type or the ____________./duplex type
The principal purpose of refractory and insulation installed in the firebox of an auxiliary boiler is to ____________./protect the inner casing and reduce heat loss
Fins are installed on the fireside of the water-tubes, used in waste heat boilers, to ____________./increase the heat transfer surface area
Auxiliary boilers can be classified as ________________./all of the above
Fins are installed on the fireside of the water-tubes used in waste heat boilers to ____________./increase the rate of heat transfer
The rate of heat transfer in a water-tube auxiliary boiler can be increased by ____________./installing fins on the firesides of water-tubes
Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because _____________./steam and water are separated in the accumulator (flash chamber)
Before any work is done on a burner in an automatically fired auxiliary boiler, you should always ___________./close all manually operated fuel valves
Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are _____________./cycled on and off in response to steam demand
The fuel oil strainers located in the fuel oil service system of an automatic auxiliary heating boiler are either the duplex type or the _______________./simplex type
Auxiliary boilers are divided into several classifications, one of which is ______________./water-tube forced circulation
Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by ___________./refractory and insulation
Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet?/The fusible plugs will melt.
A waterside fusible plug, installed in a fire-tube auxiliary boiler _____________./by design, is drilled with a tapered hole so that boiler water pressure holds the fusible metal in the bronze body
A horizontal fire-tube package boiler, incorporating a two-pass design, is basically constructed with ____________./removable spiral metal gas retarders being inserted in the tubes to decrease the gas velocity to a minimum, thus extracting the maximum caloric heat value
The fusible plugs used in fire-tube auxiliary boilers are installed in the _____________./crown sheet
Waste heat boilers may be equipped with vents on the feed water heater heads to ____________./prevent air binding
The tube sheets installed in a fire-tube auxiliary boiler are normally connected by ____________./fire-tubes and stay-tubes
In a coil-type forced circulation auxiliary water-tube boiler, ____________./steam demand response is comparatively rapid
Which type of pump is typically used to supply fuel to a unit type auxiliary boiler?/Rotary
According to Coast Guard Regulations (46 CFR), the maximum allowable boiler pressure in which a tubular gage glass may be installed is _________./250 psig
A distorted furnace in a fire-tube auxiliary boiler may be the result of ____________./overheating, due to waterside deposits
The principal purpose of refractory and insulation installed in the firebox of an auxiliary boiler is to ____________./protect the inner casing and reduce heat loss
Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?/To ensure that the valve will not be seized shut when hot.
According to Coast Guard Regulations (46 CFR), the highest boiler pressure where a tubular type gage glass may be installed is ______________./250 psig
Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always _____________./close all manually operated fuel valves
During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as ____________./limit controls
When checking for the presence of sulfite in the feedwater of an auxiliary boiler, you are in essence checking ____________./to ensure the compound additions are adequate for controlling dissolved oxygen
Coast Guard Regulations (46 CFR) permit the use of which of the listed fuel oil ignition methods on an automatically fired auxiliary boiler?/A high energy electric spark
To test the operation of the flame failure switch of an operating automatically fired auxiliary boiler, you should _____________./close the manual fuel valve with the burner firing
On auxiliary boilers using individual flame scanners to monitor the main and pilot flames, the main flame scanner should be sighted to ______________./avoid detecting the pilot flame
