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Oil Burner's Test Questions | 100% Correct
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In an electric circuit for the wattage to remain the same if the voltage drops, the amperage must - ✔✔Increase Atomizing type burners were designed to burn which type of fuel - ✔✔Type 2 fuel oil Pour point problems with outside above ground fuel tanks can be partially relieved by - ✔✔Reducing the pour point of No. 2 fuel oil by blending it with No. 1 fuel oil. A fuel oil storage tank cannot be installed - ✔✔In the furnace room with 5' of heating unit. The primary purpose of a fuel pump on a high-pressure burner is to - ✔✔Deliver oil at a constant and regulated pressure to the nozzle If the vacuum reading is substantially above the calculated reading, (with the burner running) the cause may be - ✔✔Plugged fuel filter, Kinked oil supply line, Check valve sticking With most new flame retention burners, the motor speed is - ✔✔ 3450 To check for proper nozzle line cut-off, the pressure gauge is installed in the - ✔✔Nozzle Port Fuel units are generally set at the factory at - ✔✔100psi The oil burner nozzle in a high-pressure burner performs the following functions - ✔✔Atomizes the oil Provides a pattern of oil spray Delivers a fixed amount of oil
The nozzle flow rate, spray angle and pattern are directly related to - ✔✔•Tangential slots
. Swirl chamber Orifice Cold oil or high viscosity problems may be eliminated by - ✔✔•Increasing pump pressure and reducing nozzle size
- Installing a nozzle line pre-heater The following conditions or elements affect choosing the correct nozzle spray pattern - ✔✔•Air-oil mixing design of burner •. Shape of the chamber Which condition affects nozzle spray droplet size? - ✔✔Fuel Pump Pressure To burn one pound of fuel oil, it takes how many pounds of air? - ✔✔•14.4 lbs. A layer of soot 1/16" thick will increase fuel consumption by (Fuel consumption increase by 2 % for each 1/32 of soot) - ✔✔8% When sizing a combustion chamber for a firing rate of 1.00 gph you should provide a minimum floor space of (•20 square inches per 0.25 of GPH) - ✔✔•Between 80 to 100 square inches The most common type of burner design in use today is the - ✔✔High pressure atomizing Poor draft due to a faulty chimney may be improved by installing a good - ✔✔•Draft inducer The pressure differential produced by chimneys is best measured with a draft gauge in - ✔✔Inches of water column The most important draft measurement to be taken on any oil-fired unit is - ✔✔The draft at the breech
In which type of system does the ignition transformer stay on for the full time the burner is running? - ✔✔•Intermittent •b. Constant A typical ignition transformer is of what type? - ✔✔step up During a normal start-up, when current is applied to a split phase burner motor with an open centrifugal switch - ✔✔•The motor will not start The switch opens when the motor has almost reached full speed. - ✔✔•Centrifugal The most speed(s) used in American made burners have been: - ✔✔3450 rpm Because burner fans have beveled blades any dirt or lint in the blade will - ✔✔•a. Reduce the amount of air for combustion The fan-limit control on a warm air unit is used to: - ✔✔•Shut off the burner at a predetermined temperature •Start the blower at a predetermined temperature Stop the blower at a predetermined temperature In all residential oil heating systems, the high limit control must be - ✔✔Line voltage and wired in series with the primary control Low voltage thermostats are more widely used than line voltage thermostats because - ✔✔They are more sensitive to ambient temperature When a thermostat appears to be out of calibration it is important to first - ✔✔Be sure the thermostat is level Check to see that the hole behind the thermostat is sealed off properly .Be sure that the thermostat is acclimated to the room temperature
The primary control must be capable of - ✔✔•Reacting to the absence of flame •. Controlling the ignition and motor
- Locking out on safety in the event of a flame failure Because of the cad cell eye's limited light sensing range, it can only be used effectively to - ✔✔detect light in the chamber It has been established that____of steam pressure is sufficient to operate any residential one pipe steam system. (2 is the maximum pressure. Normal set up is 1 psi) - ✔✔1 psi When installing a replacement steam boiler, it is important to - ✔✔• Follow the manufactures piping instructions In the early 1900's what was invented to prevent water from leaving the steam boiler should a return Iine develop a leak - ✔✔Hartford loop
- One of the reasons a radiator on a two-pipe steam system fails to heat may be: - ✔✔A faulty thermostatic trap A steam syphon (pigtail) should always be installed between the pressure control and the boiler to: - ✔✔Place a water seal between the boiler and the pressure control
- In a one pipe steam system, the minimum distance between the water level and the bottom of the lowest steam carrying pipe is: - ✔✔28inches To prevent scalding temperatures at the domestic water fixtures when using a tankless coil it is necessary to install a: - ✔✔Scalding valve A typical residential zone valve for a hot water heating system normally operates on: - ✔✔24 volts
By replacing an old burner with a new retention head burner, off-cycle losses are reduced because - ✔✔It restricts the draft induced air flow through the burner A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to - ✔✔Match the nozzle to the heating load The _ are important for both on and off cycle efficiency in a fire tube boiler - ✔✔Limit Controls Before lowering the temperature of a hot water boiler, consideration must be given to the - ✔✔Design of the heating The boiler or furnace is not the only source of heat loss. The heating system can lose heat through - ✔✔•insulated steam pipes
- Un-insulated hot water pipes
- Un-insulated warm air ducts A condition often overlooked on a call involving odors is - ✔✔Un-insulated warm air ducts To test a cad cell eye, you need a - ✔✔Ohmmeter When testing a fuel unit cut-off, the pressure at the nozzle port should - ✔✔Drop and hold at 80% Power venters that are installed inside the structure should be - ✔✔Mounted as close to the outside as possible When the installation instructions call for a draft regulator with a power vent system, it should be installed - ✔✔•a. Between the boiler or furnace and the power venter When running warm air trunk lines or branches through such areas as crawl spaces, garages or attics the duct work must be - ✔✔insulated
When running warm air trunk lines or branches through such areas as crawl spaces, garages or attics the duct work must be: - ✔✔Direct supply, direct return When using a ____ heater, it is necessary to maintain sufficient boiler water temperature to heat the domestic hot water - ✔✔Skim the boiler through a nipple at the water level after a few days of operation A reverse acting aquastat is used in a hydronic system to - ✔✔Stop the circulator when the water temperature falls below a preset temperature Burner air fans are manufactured to very close tolerances because an unbalanced fan can - ✔✔•Put a strain on motor bearings
- Create vibrations When wiring a burner for intermittent ignition using a stack type primary control the transformer is wired to terminals 2 and - ✔✔ 4 Which substance offers the most resistance to the flow of electricity - ✔✔Carbon Which substance offers the most resistance to the flow of electricity - ✔✔Allow it to warm to room temperature and zero out the the scale Which of the following is considered the better chimney? - ✔✔•Galvanized flue pipe Air is composed of oxygen and nitrogen in what percentages? - ✔✔21 and 79 Before installing a new nozzle, the service technician should - ✔✔•Flush out the nozzle line and adapter Pulsating oil pump pressure is caused by - ✔✔•Air leaks in the suction line •b. Partly clogged fuel strainer
What is the correct procedure for performing a combustion efficiency test? - ✔✔•Draft •b. Smoke •c. CO The temperature of fuel oil can affect? - ✔✔flow rate Which of the following does not affect draft? - ✔✔Boiler Design What does AFUE stand for - ✔✔Annual fuel utilization efficiency Which substance will cause the formation of sediment at the bottom of a fuel storage tank? - ✔✔Water
- The function of the barometric draft regulator is to: - ✔✔Maintain a constant negative pressure in the chamber The droplet size of atomized fuel oil as pump pressure increases - ✔✔decreases Which of those listed below are acceptable CO2 readings for new modern equipment - ✔✔•c. 10-1/2% to 12-1/2% What are the two (2) things that must be mixed to have proper combustion - ✔✔•Fuel oil vapor •b. Combustion air What two major components make up fuel oil? - ✔✔hydrogen and carbon Incomplete combustion causes - ✔✔soot and smoke Poor efficiency Low CO
- Increasing fuel pump pressure will cause the flow rate through the nozzle to - ✔✔increase . One advantage to lightweight combustion chambers is they: - ✔✔cool down quickly Flame retention oil burners do not depend as much on _____ for good combustion as did older boilers - ✔✔chimney draft Excess air in the combustion process lowers system efficiency by: - ✔✔increasing draft The two properties of light weight combustion chambers are: - ✔✔rapid cool down and rapid heat up
- What are the three types of heat transfer: - ✔✔conduction convection radiation When a boiler or furnace is oversized, off cycle heat losses...... - ✔✔increases Which are advantages that new and properly adjusted oil fired boilers and furnaces offer over older units: - ✔✔•Economical operation •b. Improved reliability •c. Cleaner operation . What is the temperature range of combustion with a new burner and boiler or furnace combination - ✔✔•d. 450° to 500°F The annual fuel utilization efficiency (AFUE) is: - ✔✔A test performed to rate boilers and furnaces What steps should you follow when replacing a boiler or furnace to assure high efficiency? - ✔✔•Use AFUE ratings to select a high efficiency model
- Size the boiler or furnace properly
•c. Air flows caused by house exhaust fan The following are important factors that affect chimney performance: - ✔✔Wind Burner firing rate Air flows caused by house exhaust fan The flue connection from the outlet of the boiler or furnace to the chimney base should as _____ as possible to maintain good draft. - ✔✔short A common source of air leakage into the chimney is: - ✔✔Loose-fitting clean-out door at base of chimney What is the minimum net temperature needed at the breeching of an oil-fired appliance to prevent condensation problems - ✔✔285F The main parts of the chimney venting system used in oil heated houses are: - ✔✔•Chimney
- Flue gas collector
- Draft control (barometric damper) When installing a vent for outdoor air, codes recommend an outdoor air opening of one square inch for every ____ BTU per hour of fuel consumed. - ✔✔ 3000 What additional safety device is needed in sidewall venting systems? - ✔✔Draft proving switch In the "sealed and insulated venting system" the draft regulator is: - ✔✔Removed The post-purge control on power side wall venting systems is designed to - ✔✔• Prevent odors and nozzle fouling When installing a side wall venting system, the vent outlet must be at least ___ above ground - ✔✔1ft
A "sealed and insulated chimney system" requires: - ✔✔The flue pipe be increased one size The draft inducer fan on a side wall venting system should be installed: - ✔✔Close to the outside wall Power chimney venting: - ✔✔•Uses the existing chimney
- Uses an inducer
- Uses a power vent fan In power, vented systems, the vent cap does the following: - ✔✔•Diverts combustion gases
- Minimizes effect of wind
- Prevents rodent entry In a power venting system, what safety device cuts the burner off if the power vent does not operate - ✔✔The fan proving switch What ways are there to heat domestic hot water using home heating oil - ✔✔•Direct fired
- Indirect water heater
- Internal tankless coil Radiation is heat transfer without direct contact. true or false - ✔✔true Should hot water piping be insulated to save energy? - ✔✔yes The ¼" holes drilled in the flue pipe for combustion testing should be located: - ✔✔• Between the boiler breech and the draft regulator A significant difference between the CO2 or 02 reading at the flue pipe and over the fire is an indication of: - ✔✔Air leakage in the boiler
•b. Additives •c. Cut with Kerosene In new homes, due to their tight construction, it is necessary to provide outside combustion air to the burner. - ✔✔true In new homes, if a chimney is going to be used, it must: - ✔✔•Be correctly sized for the appliance and be insulated Distribution systems (ducts or pipes) should be: - ✔✔correctly sized What part used in the flame quality indicator is common to the oil industry today? - ✔✔a cad cell eye In energy efficient homes of the future, oil may be used to provide: - ✔✔Heating The flame quality indicator (FQI) monitors flame: - ✔✔Brightness Which of these conditions can cause burner short cycling? - ✔✔• heat anticipator that is not set properly.
- The high limit control is set too low.
- Oversized equipment. The spark gap setting on an electrode assembly should normally be: - ✔✔1/8" The capacity of a high-pressure oil burner nozzle is rated in: - ✔✔GPH gallon per hour Nozzles are available in three major spray pattern types: - ✔✔Solid, semi, hollow What type of motor is used on a residential high pressure oil burner? - ✔✔Permanent split capacitor
The most common motor speed(s) used in American made burners are: - ✔✔3450 rpm If a home has an oil-fired system with an inside oil storage tank, what is added as a safety feature to protect against liquid fuel fires? - ✔✔a fusible plug Excess air in the combustion process lowers system efficiency by: - ✔✔increasing draft If an oil has a high viscosity: - ✔✔• It is thicker oil under low temperatures When a cad cell see an oil burner flame its resistance should be: - ✔✔Below 1,600 ohms of resistance When a cad cell is in the dark, its resistance should be: - ✔✔Above 10,000 ohms of resistance What two flame detection devices are used in oil fired primary controls? - ✔✔•Bimetal and cadmium sulfide Which component is used to control primary air in a high-pressure gun burner? - ✔✔•An adjustable air damper Which component is used to increase air velocity in the air tube of a high-pressure gun burner? - ✔✔The adjustable air collar The flame color characteristic of a high-pressure gun burner should be: - ✔✔A yellow-orange color For every pound of fuel oil that is burned, how many pounds of primary air are required'? - ✔✔14. For every pound of fuel oil that is burned, how many pounds of excess air are required'? - ✔✔7.
A high CO2 reading in an oil-fired appliance could indicate: - ✔✔•b. A proper and efficient fire A properly set up and adjusted oil fired appliance should produce a CO2 measurement of: - ✔✔•10% to 12% A common over the fire draft for an oil appliance is: - ✔✔-.01" we to - .02" we A common breech draft for an oil appliance is: - ✔✔-.03" WC to - .06" WC
. If the draft through an appliance is too high, what adjustment should be made. - ✔✔• Adjust the barometric damper to more of a closed position Breaking up oil into small droplets is called: - ✔✔Atomization What is the approximate safety timing of a stack primary control? - ✔✔60 to 90 seconds On a high-pressure gun burner, what two problems can prevent oil from flowing to the nozzle? - ✔✔b. A broken coupling and a plugged inline filter
