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WorksheetsVolume 4 URE
Total questions: 100
Worksheet time: 25hrs 0mins
How is static electricity best controlled?
100% cotton clothing
Avoiding flammable leaks
Visually inspect static electricity
Grounding, bonding, humidifying
Grounded wires carrying off static charges
Bonds with static charges
Creates an electrical hazard
Increases the difference in electrical potential
Neutralizes the difference in electrical potential
A fuel spill should be reported when how many gallons or more is leaked or spilled?
5
10
25
35
A leak of 35 gallons should be reported to the state regulator within
24 hours
48 hours
72 hours
1 week
When the viscosity of an oil is decreased, how does it affect the oil?
Worse for atomization
More difficult to flow
Harder to pump
Easier to pump
Which type of condition could cause a blocked burner?
Clean oil
Sludge in oil
Low viscosity
Very low viscosity
Which procedure is best to use for efficiency if the tank is below the level of the burner?
A two-stage pump with a three-pipe system
A single-stage pump with a two-pipe system
A two-stage pump with a single-pipe system
A two-stage pump with a two-pipe system
Why is a galvanized pipe not used with fuel lines?
It can cause corrosion problems
Because it will begin to conduct electricity
Galvanized pipe is too restrictive to oil flow
The galvanized steel explodes on contact with fuel oil
Why is a gate valve located on the tank side of the strainer?
To protect the tank during cleaning
To permit greater flow to the strainer
To collect sludge before it hits the strainer
So the suction line is isolated when cleaning the strainer
Liquefied petroleum gas (LPG) is stored and transported in
It’s liquid state
It’s solid state
It’s gaseous state
A mixture of natural gas
Ten percent of a liquefied petroleum gas (LPG) tank is not filled to
Save gas for another tank
Accommodate for expansion
Accommodate for contraction
Accommodate for freezing temperatures
The action that happens to the safety shutoff valve in the main burner line once a pilot flame is detected is it
Remains closed until a technician opens it
Locks out for safety
Is opened
Is closed
Which device removes any accumulated gas in the combustion chamber burner?
Blower
Dampers
Reset switch
Venturi effect
What are the three categories of gas supply systems?
Low, high, and superheated
Ultralow, low, and medium
Low, mid-level, and high
Low, medium, and high
Identify what you would use to determine if water is in the oil
Vent caps
Oil level gauge
Five cups of water dye
Tank stick with water finding paste
Identify all the necessary elements that must be present for combustion?
Heat and air
Air and fuel
Heat and a spark
Heat, air, and fuel
How much of the flue gases are made up of nitrogen?
59%
66%
79%
88%
Why is carbon monoxide undesirable in flue gases, besides the fact that it is dangerous?
It’s presence in flue gases represents a waste of fuel
When it is present there is less than 20% efficiency
When it is present there is less than 40% efficiency
Its presence in flue gases means combustion is not taking place
The turndown of the burner is the ratio of the
Maximum firing rate to carbon dioxide
Minimum firing rate to the average firing rate
Corbin monoxide to excess air and pure oxygen
Maximum firing rate to minimum firing rate
Identify the relationship between excess air and complete combustion.
Excess air will blow the flame out and stop combustion
It is less than what is needed for theoretical combustion
Excess air is needed for complete combustion
Excess air saves the heat from leaving the stack
The condition that affects infiltration losses is the volume of
Make up air
Inside air that stays indoors
Inside air that escapes ouside
Outside air that leaks through cracks and crevices
A pressure-gun burner achieve flame turbulence by
Modulating the gas control valve
Fully closing then opening the fuel valve
Causing straight air flow as it leaves the gun tube
Causing the air to whirl as it leaves the gun tube
The effect too much air has on a flame is that it makes it
Short, noisy, and keeps it near the burner
Short, noisy, and tends to pull away from the burner
Short, quiet, and tends to pull away from the burner
Long, noisy, and tends to pull away from the burner
Identify the cause of a high CO, reading during combustion.
Zero air supplied for combustion
Insufficient start and over firing
Sufficient draft and over firing
No fuel or gas in the supply line
Where does the signal to open and close a gas valve come from on modern equipment?
Manually operated switches
Manually operated valves
Pneumatic devices
Control board
How does an inspirating burner bring in primary air?
Large fans
Venturi action
Forced draft action
Pulse burner principles
The pulse burner introduce gas and air
In operating phases
Every 30 seconds
In one single phase
Every 45 seconds
Where does gas and primary air mix in a premixing burner?
Before they reach the burner port
After they reach the burner port
In the combustion chamber
Inside the burner port
How long will an intermittent pilot stay lit?
During the entire run period
During ignition sequences
For 2 to 5 seconds
Never
The mixture of air is affected by a reduced gas velocity because it allows for
Incomplete mixing before it exits the burner ports
Complete mixing before it exits the burner ports
Complete mixing after it exits the burner ports
Partial mixing after it exits the burner ports
What affects the voltage generated by a thermocouple?
Ignition detection
Temperature sensed by fan controls
Temperature sensed at the limit control switch
Temperature difference between hot and cold junctions
The relationship between a sensing thermocouple and a standing pilot is the
Pilot ignites the thermocouple
Thermocouple ignites the pilot
Thermocouple senses the standing pilot and determines if it is lit correctly
Standing pilot senses the thermocouple and determines if it is lit correctly
Hot-surface ignitors are located in relation to gas flow by a location in which
Air will pass over it when the gas valve closes
Gas will pass over it when the gas valve opens
Gas will pass over it when the gas valve closes
Gas will avoid it when the gas valve opens
The way the control module can determine if the glow coil is hot enough to ignite the fuel is due to the resistance of
Fan pressure
Limit control
Glow coil or a time delay
Solenoid coil or a time delay
A solid-state device can detect the presence of a flame because the pilot flame conducts the
Current to the grounded pilot
Voltage to the grounded pilot
Current to the grounded motor
Current to the grounded bearings
Which type of work is checked for completion during the pre-operational inspection of a gas burner?
Troubleshooting
Operations Management work
Operation of the motor and burner
Installation, repair and cleanup work
Identify what the thermocouple is inspected for during the pre-operational inspection?
Carbon deposits, corrosion or heat damage
Proper insulation of hot junction
Ensure flame will not be near it
Proper output voltage
How long should you wait for gas to clear from the combustion chamber?
5 minutes
15 minutes
31 minutes
24 hours to be safe
How often should you remove, dismantle, and clean a main burner?
Never
Every 10 years
Every 2 months
At least once a year
A forced draft affect oil burners because it
Decreases oil flow
Increases their oil burning capacity
Decreases their oil burning capacity
Forces them to be converted to gas burners
The effect a nozzle has on high pressure oil passing through it is it
Will not affect the oil due to high pressure
Creates a star shaped flow
Produces a fine mist
Blocks flow
A gun type burner gets its 10,000 volt electric spark from the
Fan limit switch once it closes
Step-down transformer
Step-up transformer
Solenoid valve
Where is the high pressure gun type nozzle’s angle of spray located?
On the nozzle’s filter
Inside the nozzle filter
On the side of the nozzle
Near the outlet of the nozzle
What is the combustion chamber inspected for during an oil burner pre-operational inspection?
Cabinet insulation
Pools of unburned oil
Proper asbestos insulation
Proper opening and closing
Which action should be taken if pools of unburned oil have flooded the combustion chamber?
Remove the burn and light the pool of oil
Light the burner to burn off the flooded oil
Light the burner and run out of the boiler room
Soak it up with rags and purge the combustion chamber
How is the spark moved into the path of the oil spray?
Through gas pressure
Air from the fan will flow the spark into the path
The solenoid valve will provide a “push” to the spark
The electrodes automatically move to out spark into patheay
Which action should follow an air or oil pressure adjustment?
Flue gas analysis
Seasonal shutdown
Nozzle spray check
Pre-operational inspection
How do commercial burners very their firing rate
Pneumatically only
Decreasing water supply
Electrically or electronically according to the load demand
Electrically or electronically according to the outlet temperatures
Why should you not phototcells to detect gas flames?
Liquefied petroleum gas (LPG) is too heavy of a gas and “fogs up” the photocell
Because a well-adjusted gas flame emits too little visible light
Gas flames are too dangerous to be used around phototcells
Natural gas corrodes the photocell
How does a cad cell detect light from an oil flame?
Light-sensitive lead
Light-sensitive cadmium sulfide
Light-sensitive aluminum
Light-sensitive aluminum sulfide
A factor the flame rod system depend upon is the
Fuel oil’s viscosity
Solenoids ability to conduct current
Flames ability to conduct current when an electrical potential is applied across it
Flames ability to increase resistance when an electrical potential is applied across it
The purpose of the preignition function is to ensure
A spark before prepurge
There is an arc when the blower starts
There is an arc when the oil starts to flow
There is an arc when the oil stops flowing
What is a common cause of overheating the heat exchanger on a gas fired burner?
The blower not running
Thermostat problems
Low fire conditions
Proper air flow
Identify the purpose of the draft hood.
Make up for force or air the blower cannot crate
Maintain constant head pressure on the combustion system
Prevent a constant head on the combustion system
Maintain fluctuating head on the combustion system
Which device(s) creates the resistance that blowers must overcome?
Pilot piping
Solenoid valves
Combination gas valves
Furnace air passageways, filters, and ductwork
Where does return air enter on an upflow furnace?
Inside the combustion chamber
Through the top of the blower compartment
Through the top or side of the blower compartment
Through the bottom or side of the blower compartment
Negative pressure is corrected in a well-sealed building by installing
Another combustion fan
A negative pressure kit
An additional blower
A make-up air unit
How is the furnace fan control connected with the blower motor?
Induction
In series
In parallel
Magnetic field
When the thermostat is turned down past the ambient temperatures the burner should
Enter ignition carryover
Start trial for ignition
Turn on
Shut off
Which action is the first step in checking the safety limit control?
Turn power OFF and disconnect the blower circuit
Turn power OFF and connect the blower circuit
Turn power ON and connect the blower circuit
Turn power ON and disconnect the blower circuit
Which type of control is not usually located on the radiant heater?
Air pressure switch
Ignition control
Transformer
Thermostat
Which inspection process is performed after the radiant heater pre-operational inspection?
Safety check
Gas line check
Gasses in the air
Operational test
How many seconds should the thermostat be turned off to take the system out of lockout?
20
60
80
90
What should be done before making any thermostat adjustments for a forced air furnace?
Ensure the blower functions properly
Ensure bearings are not overheating
Ensure no exposure from heat or too cold from the windows, doors, or drafts
Ensure there is a lot of exposure from heat or too cold from windows, doors, or drafts
The fan’s OFF temperature setting is generally set for how many degrees above the desired room temperature
0 to 5o F
3 to 5o F
5 to 10o F
15 to 20o F
If you need to remove soot from the heat exchanger, what should you use?
Your hands
Garden hose
Vacuum cleaner
Pressure washer
How is a radiant heater’s combustion air intake inspected?
Disconnect air intake and inspect internally using a flashlight
Connect vent pipe and inspect externally using a flashlight
Disconnect air intake and inspect externally for weight
Connector intake and inspect internally using a level
Which effect does an increase in pressure have on the boiling point?
It decreases it
It cuts it in half
It increases it
It keeps it the same
Which formula is correct when you need to determine the temperature of water in a steam boiler?
psi x 14 + 98
psi x 14 + 199
Square root of the psi x 14 + 198
Square root of the psi x 18 + 298
Where is the internal feed pipe located in a steam boiler?
Out of the water space near, but not touching, the bottom of the steam drum
Out of the water space near, but not touching, the top of the steam drum
In the water space near, but not touching, the bottom of the steam drum
In the water space near, but not touching, the top of the steam drum
What must the mechanical draft systems overcome?
Gas pressure
Oil pressure
All draft losses
Close gas valves
Water-hammer is avoided in the piping system by using
Flashtanks
Globe valves
Tandem valves
Blowdown valves
What does the probe-type low water cutoff depend on to operate?
Steam
The Seebeck effect
The flow of oil in its gears
The flow of a low electrical current
Feed water attaches to discharge below the boiler water line so it
Can be drained quicker
Disturbs normal water circulation
Increases the heat load on the boiler
Doesn’t disturb normal water circulation
The check valve location is in the feed line
Near the drain
Near the boiler
Near the radiators
Near the gas main
Why are condensate returns necessary?
To keep surge tanks 100% full
Because some steam converts back to water
To provide hot condensate for heating systems
Because steam would never condense without them
Thermostatic traps react to a difference in
Volume between steam and fuel oil
Current between steam and condensate
Pressure between steam and condensate
Temperature between steam and condensate
Condensate is subcooled in a thermostatic trap by allowing
No condensate to stay in the trap
It to back up in the trap and a portion of the upstream drip leg piping
It to back up in the radiator and a portion of the upstream drip leg piping
It to back up in the radiator and a portion of the downstream drip leg piping
Which action does condensate trapped in a coil prevent?
Steam in the surge tank
Even steam distributions
The burner from firing
Condensate from heating radiators
Which return water temperatures are condensing boilers designed to support?
Low
High
Ultra-low
Ultra-high
Why are the internal parts and stack of a condensing boiler constructed of corrosion resistant material?
Because condensing boilers are smaller
Because of the paints used with these boilers
Because the condensation can become corrosive
The burners with these boilers create corrosive gases
Why are make-up water requirements low in a closed boiler system?
It is vented to the atmosphere
The water is open tot he atmosphere
The water circulates in the closed system
Closed boilers never need make-up water
Which characteristic affects the amount of water that flows through a pressure regulator?
Pipe length
Stack length
Spring tension
Burner efficiency
Identify the proper position of bypass valves during normal operation.
25% open
50% open
100% open
Closed
The action that will happen to the safety relief valve if the boiler and system rises above the set pressure of the valve is it will
Open
Close 25%
Close 50%
Close 100%
Identify the relationship between an aquastat’s pump control and cool water on a boiler.
The control prevents the circulation of any water
The control prevents the circulation of hot water
The control increases the circulation of cool water
The control prevents the circulation of cool water
Which connection prevents air and gases that are released from the heated water in the boiler, from entering the distribution system?
Stream traps
The diptube
The drain valve
The blowdown valve
Which device operates the switch that stops power to the main burner on float-type low water cutoff?
Float
Probe
Thermistor
Thermocouple
Which device does a hot water system use to handle the expansion and contraction of water?
Blowdown valve
Expansion valve
Expansion tank
Check valves
Which type of tests should water gauge glasses be checked for checked for during a pre-operational inspection?
Insulation
Ensure they are muddied and dirty
Hit glass with hammer to test its strength
Clear visibility of the gauge glasses from the operating floor
Which position should the inlet and outlet cables of the circulators be in when filling a boiler system?
Open
Closed
30% open
Remove these valves while filling the boiler
Identify what must be done if an expansion tank loses its air cushion
The tank must be charged
It must be filled 100% with air
It should be placed in a vacuum
It must be filled 100% with water
How is only the water level raised in an expansion tank?
Open the air vent valve until desired water level is obtained
Open the blowdown valve until desired water is obtained
Close the air vent valve until desired water level is obtained
Open the safety relief valve until desired water is obtained
How is diesel fuel supplied to the combustion chamber on a WH-400 system?
Venturi action
Manual hand valve
A belt driven fuel pump
A motor-driven fuel pump
How is the fuel mist ignited in a WH-400 system?
Sparks from the electrodes
The BCU lights the most with 120 volts
The HCU lights the most with 120 volts
Sparks form the solenoid valve and HCU
When will the heat control switch (HCU) energize the fuel burner motor and spark igniter on 130k heater?
After a 15 second delay
After a 15 minute delay
If sensor temperature is higher than programmed value
If sensor temperature is lower than programmed value
Identify what the burner control unit do after ignition on a 130k heater?
Monitors combustion through a photocell
Immediately initiates post purge
Immediately initiates pre purge
A 35 second safety recycle
Identify the maximum circuit breaker size for a 130k heater?
3A
15A
20A
35A
When does the “protective overheating switch-off” occur on a 130k heater?
When combustion won’t start
When air flows freely in ducts
When fuel solenoid valve is stuck closed
When airflow is blocked by kinked ducts or blocked main air blower intake
Which state will occur if the burner control unit (BCU) locks out and is reset three times during the same burner cycle on a 130k heater?
Lock-up
Latch-up
Closed-up
Opened-up
