B1-5 Heating Boilers Flashcards
A disadvantage of the water tube or tubular boiler is:
A) its long warm up period
B) the foundation requirements due to mass
C) its thermal stresses
D) water treatment monitoring
E) its high maintenance cost
D) water treatment monitoring
The copper tubular heating boiler:
A) is available in very large capacities
B) is equipped with an external combustion chamber
C) is comprised of many separate tubular copper rings connected to inlet and outlet headers
D) has good heat transfer and is resistant to corrosion
E) can be used only with gaseous fuels such as natural gas and propane
D) has good heat transfer and is resistant to corrosion
The copper tube tubular boiler: A) has a one part heating surface B) is capable of very large capacities C) has the furnace in the upper section D) can be gas or oil fired E) is highly susceptible to corrosion
D) can be gas or oil fired
Low pressure water tube and tubular heating boilers have the following advantages:
1) bent or coil tube design avoids thermal stress and distortion
2) rapid response to fluctuating loads
3) supplied as packaged units completely equipped with firing equipment, automatic controls, and safety devices
4) safer than fire tube boilers in the case of tube failure since the boilers contain very little water and no disastrous explosion could occur
5) maintenance cost low
A) 1,2,4 and 5 only
B) 2,3,4 and 5 only
C) 1,3,4 and 5 only
D) 1,2,3 and 5 only
E) 1,2,3,4 and 5
E) 1,2,3,4 and 5
The sections of a cast iron sectional boiler are pulled and held together by: A) expansion bolts B) pull nipples C) tie rods D) cast iron pipes E) steel studs
C) tie rods
Most cast iron heating boilers:
A) are suited to high operating pressures
B) are lightweight and require minimum foundations
C) cannot be site assembled
D) can be easily moved through standard size doorways
E) require none of the traditional boiler fittings
D) can be easily moved through standard size doorways
A cast iron boiler advantage is:
A) the choice of assembly location
B) its high factor of brittleness
C) their large capacity
D) light weight resulting in lesser foundation requirements
E) its ability to withstand high pressure
A) the choice of assembly location
An advantage of cast iron heating boilers is:
A) capacity can be increased by addition of more sections
B) they are suited to high operating pressures
C) they can withstand shock loads due to high ductility
D) they require none of the traditional boiler fittings
E) they are lightweight and require minimal foundations
A) capacity can be increased by addition of more sections
A boler which is factory built, fire tested and transported to the site complete with al controls, feed and fuel systems, and auxiliary equipment is called a: A) field erected boiler B) packaged boiler C) preassembled boiler D) water tube boiler E) fire tube boiler
B) packaged boiler
Packaged fire tube boilers may be constructed with up to: A) five gas passes B) four gas passes C) three gas passes D) two gas passes E) one gas path
B) four gas passes
A fire tube boiler commonly used for hot water heating systems in residences and small apartments is the: A) HRT unit B) firebox unit C) scotch fire tube packaged unit D) tubular unit E) steel plate vertical unit
E) steel plate vertical unit
One of the earliest fire tube boilers was the: A) haycock boiler B) firebox boiler C) HRT boiler D) locomotive boiler E) marine boiler
C) HRT boiler
Maximum static pressure allowed in a fuel oil line of a fuel oil storage system is approximately: A) 10 kPa B) 15 kPa C) 35 kPa D) 70 kPa E) 101.3 kPa
D) 70 kPa
The capacity of a constant capacity mechanical atomizer is a function of: A) pump size B) pump speed C) orifice size D) oil viscosity E) supply pressure
C) orifice size
Generally, rotary cup oil burners are of the constant capacity type and are used with: A) high low control B) on off firing control C) multiple burner boilers D) modulating fire control E) high limit control
B) on off firing control
Oil flow rate to a modulating burner is regulated by: A) a return line control valve B) a PRV on the burner line C) pump speed D) pump capacity E) firing rate
A) a return line control valve
A solenoid type fuel valve: A) is held closed by electrical current B) closes slowly C) is held closed by fuel pressure D) does not have positive shutoff E) always opens rapidly
C) is held closed by fuel pressure
An essential fitting between the boiler and the steam pressure gauge is: A) a gate valve B) a gauge glass C) a steam trap D) a syphon E) a check valve
D) a syphon
A gas burner pilot that is ignited before the burner operation, and which burns throughout the burner "on" period is the: A) intermittent pilot B) ring pilot C) standing pilot D) interrupted pilot E) hi intensity pilot
A) intermittent pilot
When installing a syphon, it:
A) should be first filled with water
B) shall be as close to the boiler as possible
C) must be purged with nitrogen or other inert gas before connecting
D) must be connected to the piping without any isolating valves
E) should be downstream of an inspector’s test connection
A) should be first filled with water
A steam pressure gauge is graduated in: A) kilopascals B) kilograms per square centimetre C) pascals D) pascals per square meter E) kilograms per hour
A) kilopascals
Raising the blowdown ring on a safety valve will:
A) decrease the popping pressure
B) increase the popping pressure
C) decrease the amount of blowdown
D) decrease the valve’s discharge capacity
E) increase the amount of blowdown
E) increase the amount of blowdown
To prevent tampering with a safety valve setting, boiler inspectors install a) A) restraining order B) plug C) seal D) gag E) cover plate
C) seal
For low pressure steam boilers, the water column is constructed of: A) forged steel B) bronze C) cast iron D) stainless steel E) copper
C) cast iron
For a steam heating boiler, the lowest visible part of the gauge glass must be higher than the lowest permissible water level by an amount of: A) 15 mm B) 25 mm C) 35 mm D) 51 mm E) 76 mm
B) 25 mm
In order to test the gauge glass, the safety shut off gauge valve should be:
A) partially open
B) fully closed
C) open only 1/4 turn to change from fully closed to fully open
D) turned slowly until fully open during the test
E) fully open
A) partially open
Loss of air cushion in a closed expansion tank will result in:
A) a decrease in system temperature
B) system pressure increasing and the relief valve opening
C) increased corrosion in piping
D) an increase in system water temperature
E) the water level in the tank decreasing
B) system pressure increasing and the relief valve opening
When a closed expansion tank is used and the system is cold:
A) the tank level will be high
B) there will be no air in the tank
C) the auto fill valve will maintain a minimum pressure
D) the system should be manually filled
E) the possibility of air in the system will be high
C) the auto fill valve will maintain a system minimum pressure
The cushion tank of a closed hot water heating system is usually located:
A) below the level of the boiler
B) midway between the boiler and the highest point in the system
C) in the boiler room
D) above the highest point in the heating system
E) in its own separate room
C) in the boiler room
The temperature indicator of a hot water boiler should indicate water temperature: A) midway through the system B) in the expansion tank C) at the boiler outlet D) in the boiler E) at the boiler inlet
C) at the boiler outlet
A gradual increase in stack temperature is an indication of: A) poor damper operation B) poor burner operation C) unclean heating surfaces D) too much excess air E) all of the above
C) unclean heating surfaces
With regards to steam heating boilers, fresh makeup water should be added to the: A) blowoff tank B) condensate return tank C) steam drum D) feedwater supply line E) expansion tank
B) condensate return tank
If slight smoking occurs during startup of a cold oil fired boiler, the operator should:
A) shut down the boiler and investigate the reason
B) continue with the warmup and check the condition again when the boiler is in normal operation
C) increase steam or air atomizing pressure
D) increase the firing rate to complete the warm up as soon as possible
E) immediately call an instrumentation mechanics to adjust air to fuel controller
B) continue with the warmup and check the condition again when boiler is in normal operation
If the safety relief valve on your hot water boiler was opening up, the cause could be: 1) steam collecting in the water space 2) expansion tank completely filled with water 3) faulty automatic fill valve 4) circulating pump running too slow A) 2,3,4 B) 1,3 C) 2,3 D) 2,4 E) 1,2,3
C) 2,3
A packaged tubular steam boiler often has a steel sheathing in front of the waterfall tubes due to:
A) the high corrosion action of the combustion process
B) the erosive action of the flame
C) overheating of the tubing due to poor circulation
D) the formation of superheated steam in the tubing
E) the high radiant energy from the flame
B) the erosive action of the flame
To maintain salt concentrations within safe limits, packaged tubular steam heating boilers are equipped with:
A) an accumulator mixing chamber
B) a liquid flow control device
C) a reverse osmosis desalinator
D) a mixed bed condensate polisher
E) an accumulator automatic blowdown system
E) an accumulator automatic blowdown system
The A type of water tube heating boiler has: A) three lower drums or headers B) one lower drum or header C) copper or stainless steel tubes D) no lower drums or header E) two lower drums or headers
E) two lower drums or headers
A disadvantage of the water tube or tubular boiler is:
A) its thermal stresses
B) the foundation requirements due to mass
C) water treatment monitoring
D) its high maintenance cost
E) its long warmup period
C) water treatment monitoring
The sections of a cast iron sectional boiler are pulled and held together by: A) tie rods B) expansion bolts C) pull nipples D) cast iron pipes E) steel studs
A) tie rods
A cast iron boiler disadvantage is: A) its pressure limitations B) its high ductility C) its difficult assembly D) its extremely high cost E) it is subject to corrosion
A) its pressure limitations
Low pressure boilers are made of: 1) steel 2) stainless steel 3) aluminum 4) cast iron A) 1,4 B) 1,2,3 C) 2,3 D) 1,2 E) 2,4
A) 1,4
Water legs are added to vertical cast iron sectional boilers to:
A) enable the installation of blowdown connections
B) provide a location for addition of treatment chemicals
C) eliminate the need for push nipples
D) increase the heat transfer area
E) allow the boiler to have lighter foundations
D) increase the heat transfer area
A boiler in which the water is contained in a shell and has hot gases passing through the shell within tubes is called a: A) bent tube boiler B) packaged boiler C) A-type boiler D) fire tube boiler E) central heating boiler
D) fire tube boiler
Constant capacity pressure atomizing oil burners must be equipped with:
A) an external electric oil heater
B) a fine strainer
C) a high speed rotating cup
D) a constant supply of high pressure air
E) an internal electric oil heater
B) a fine strainer
A relief valve is installed on the discharge of a heating boiler’s fuel oil pump to ensure:
A) boiler capacity is not exceeded
B) pressure at the burner does not exceed design limits
C) the boiler is not over fired
D) the pump’s capacity is not exceeded
E) the burner tip does not clog up
B) pressure at the burner does not exceed design limits
The minimum distance from furnace to oil storage tank is: A) 2.1m B) 5.2m C) 7.0m D) 8.7m E) 9.81m
A) 2.1m
Burner light oil supply pressure range is approximately: A) 50-100 kPa B) 150-250 kPa C) 300-550 kPa D) 550-700 kPa E) 700-850 kPa
D) 550-700 kPa
The amount of premix air to an atmospheric burner should be: A) 40-50% B) 30-40% C) 20-30% D) 10-15% E) 5-10%
B) 30-40%
LP boiler safety valves can be repaired: A) by a licensed boiler operator B) by only the manufacturer C) only when authorized by the inspector D) by a qualified boiler operator after permission from the inspector E) by anyone qualified to do so
D) by a qualified boiler operator after permission from the inspector
A gas burner pilot that burns at all times and has to be manually ignited is the: A) standing pilot B) ribbon pilot C) intermittent pilot D) ring pilot E) hi intensity pilot
A) standing pilot
To prevent tampering with a safety valve setting, boiler inspector installs a: A) restraining order B) plug C) seal D) gag E) cover plate
C) seal
Code requirements for a heating boiler steam pressure gauge state that the travel of the pointer from 0 to 210 kPa (30 psi) shall be at least A) 12.5 mm B) 25.4 mm C) 50.0 mm D) 76.0 mm E) 103 mm
D) 76.0 mm
An LP safety valve lever test should be performed: A) annually B) semi annually C) monthly D) weekly E) daily
C) monthly
Adjusting a pop safety valve so that more steam escapes from the huddling chamber will:
A) increase the popping pressure
B) decrease the valve’s discharge capacity
C) decrease the amount of blowdown
D) increase the amount of blowdown
E) decrease the popping pressure
C) decrease the amount of blowdown
The most likely valve type(s) to be used as a heating boiler steam outlet stop valve in pipe sizes 2" and over: A) rising spindle gate or globe valves B) non rising spindle gate valve C) rising V-port valve D) non rising spindle globe valve E) rising spindle needle valve
A) rising spindle gate or globe valves
During replacement of a steam boiler's broken gauge glass, it is determined that the water level is between the bottom and the middle trycocks. The operator should: A) shut down the boiler B) open the blowoff valve C) reduce the boiler firing rate D) continue with the gauge glass repairs E) start another feed pump
D) continue with the gauge glass repairs
Should the steam line or water line to a gauge glass become plugged with sludge:
A) gauge glass level will remain where it was
B) the gauge glass will read high
C) gauge glass level will drop in both cases
D) gauge glass level will drop in the first case and rise in the second
E) gauge glass level will rise in the first case and drop in the second
B) the gauge glass will read high
The pressure temperature indicator on a hot water heating boiler is used to indicate:
A) expansion tank pressure
B) temperature of water leaving the boiler
C) height of water in the system above the boiler
D) all of the above
E) none of the above
D) all of the above
In a hot water system, if the pressure pointer on a pressure temperature indicator falls below the altitude pointer, the system:
A) has too much water
B) is over pressured
C) is not full of water
D) is below recommended operating temperature
E) is above recommended operating temperature
C) is not full of water
On a domestic hot water system, the temperature relief device will open when water temperature rises to: A) 103*C B) 121*C C) 99*C D) 85*C E92*C
C) 99*C
In a closed expansion tank system, an air separator: A) is installed at the boiler outlet B) directs air into the expansion tank C) removes air from the system D) is installed at the boiler inlet E) is not required
B) directs air into the expansion tank
With regards to hot water boilers, it is advisable to avoid prolonged operations at temperatures below: A) 77*C B) 87*C C) 100*C D) 121*C E) 131*C
A) 77*C
When laying up a boiler for an extended period, it is advisable to clean the soot from the fireside of the heating surface:
A) to see if the boiler tubes are leaking
B) because damp soot is very corrosive
C) because it can cause an explosion during startup
D) because it prevents the soot from infiltrating into the machinery in the boiler room
E) to prevent deterioration of the furnace refractory
B) because damp soot is very corrosive
With regards to steam heating boilers, fresh makeup water should be added to the: A) steam drum B) condensate return tank C) expansion tank D) blowoff tank E) feedwater supply line
B) condensate return tank
On hot water heating boilers, the differential between the safety relief valve set pressure and the boiler operating pressure should be kept to at least:
A) the greater of 25 kPa or 10% of the relief valve setting
B) the greater of 69 kPa or 25% of the relief valve setting
C) the greater of 75 kPa or 30% of the relief valve setting
D) the greater of 85 kPa or 35% of the relief valve setting
E) the greater of 103 kPa or 40% of the relief valve setting
B) the greater of 69 kPa or 25% of the relief valve setting
