NORA BRONZE TEST QUESTIONS AND ANSWERS 100% PASS

NORA BRONZE TEST QUESTIONS AND ANSWERS 100% PASS “what are the 3 basic parts of combustion? - CORRECT ANSWER fuel, heat, air" "high pressure oil forced through a nozzle does what? - CORRECT ANSWER atomizes the oil, mixes the droplets with air, allows oil to burn" "ignition point is what? - CORRECT ANSWER lowest temp at which rapid combustion of the fuel will take place in the air" "pour point #2 oil is what? - CORRECT ANSWER lowest temp at which oil will flow" "as oil gets colder does the viscosity increase or decrease? - CORRECT ANSWER increases" "water in the bottom of the tank will lead to what two things? - CORRECT ANSWER sludge and ice" "sludge is a combination of what three things? - CORRECT ANSWER water, bacteria, degraded fuel and other contaminants" "sulfur in fuel creates sulfuric acid in condensed flue gasses, what are the three most common adverse effects on this? - CORRECT ANSWER damages the flue liner, eats holes in the flue pipe, creates scale buildup in the heat exchanger" "to insure clean, uncontaminated fuel reaches the oil burner. what three things should we do? - CORRECT ANSWER install tank properly, regularly inspect and fix minor defects before they lead to major problems, install a quality oil filter" "if the vacuum is below calculation you may have what? - CORRECT ANSWER suction line leak" "if the vacuum is above calculation you may have what? - CORRECT ANSWER suction line restriction/clogged" "can a leak in the oil line pull in air without oil leaking? - CORRECT ANSWER yes" "a two stage pump is needed when you... - CORRECT ANSWER have a high lift and a long run" "what are the two benefits to a one pipe system - CORRECT ANSWER eliminates worry's of leaking return lines, decreases frequency of replacing oil filters" "a two pipe system can move ___ gallons of fuel thru the oil filter - CORRECT ANSWER 15" "pulsating oil pump pressure and pulsating fame may be caused by? - CORRECT ANSWER air leaks in the suction line" "when the combustion gasses get too cold what happens? - CORRECT ANSWER the water vapor in the flue gas will condense" "what is a power venter and what is it used for? - CORRECT ANSWER a fan to pull combustion products through the heat exchanger and out the building" "a direct vent system relies on what to push gasses out the building - CORRECT ANSWER the burner, pre-purge and post-purge control, proper installation" "a sealed shut draft regulator causes what? - CORRECT ANSWER too much draft over the fire" "chimney draft is affected by... - CORRECT ANSWER temp difference in chimney and outside air, barometric pressure, humidity and wind" "air is made up of ____% oxygen and ____% nitrogen - CORRECT ANSWER 20.9% O2 and 78% N" "a liquid co2 tester must be pumped how many times - CORRECT ANSWER 18" "the fluid in a wet kit co2 tester is good for ____ uses - CORRECT ANSWER 200" "a combustion test includes what measurements - CORRECT ANSWER stack temp, draft, smoke, excess air (co2 and o2)" "Incomplete combustion and carbon monoxide are caused by what? - CORRECT ANSWER too little/too much air, flame impingement" "a co2 of 7% at the breech and 10% over the fire indicates? - CORRECT ANSWER excess air leaks into the furnace or boiler" "more air input for the fire increases... - CORRECT ANSWER stack temp" "an electrical circuit for an oil burner will contain? - CORRECT ANSWER a conductor, switches, and loads" "the switching relays job is to... - CORRECT ANSWER control a line voltage load with a low voltage thermostat" The key final adjustment for most oil burners is? - CORRECT ANSWER Combustion Air" "Dirt or lint build-up in the bevel of the burner fan blades will? - CORRECT ANSWER Reduce the blade bevel and reduce the amount of air delivered" "To change the air ratio for different firing rates with an adjustable head burner you? - CORRECT ANSWER Move the head forward or backward, against or away from the ring closing or opening the tertiary slot" "Excessive draft drop through the heat exchanger indicates? - CORRECT ANSWER Heavy soot and scale deposit. Dirty heat exchanger" "When the combustion gasses get too cold? - CORRECT ANSWER Water vapor in flue gasses will condense back into water" "Power venters use? - CORRECT ANSWER A fan to pull combustion gasses through the heat exchanger and out of the building" "About 21% of air is made up of? - CORRECT ANSWER Oxygen" "When using a pump type smoke tester, ten full strokes are necessary to? - CORRECT ANSWER Draw the proper amount of gases through the paper" "As more air is added to the fire? - CORRECT ANSWER Co2 goes down and O2 goes up" "It is becoming more and more of a problem to get enough air to the burner because? - CORRECT ANSWER Less air gets into modern homes because they are so well insulated" "Oil burners should not generate smoke because? - CORRECT ANSWER It creates soot that will cover and insulate the heat exchanger" "To help ensure carbon monoxide does not enter buildings? - CORRECT ANSWER Adjust burners properly and be sure the venting system removes all the gases" "Incomplete combustion and carbon monoxide are caused by? - CORRECT ANSWER Too little or too much air. Flame impingement" "A combustion efficiency test includes measurements of? - CORRECT ANSWER Co2, stack temp, smoke, excess air and draft" "The fluid in a co2 tester is good for how many tests? - CORRECT ANSWER 200" "The hole in the flue pipe for combustion testing should be? - CORRECT ANSWER As close to the breech as possible" "Increasing the air input to clean up the fire will also increase? - CORRECT ANSWER Stack tempature" "We use O2 or CO2 measurements to calculate? - CORRECT ANSWER Excess air" "A CO2 reading of 7% at the breech and 10% over the fire indicates? - CORRECT ANSWER Infiltration. Air leak in the heat exchanger" "To calculate the combustion efficiency we must know? - CORRECT ANSWER Net stack temperature and CO2" "Compared to "wet kits", digital electronic combustion test instruments are? - CORRECT ANSWER Faster, more accurate and can print a result page" "Before using an electronic analyzer you must? - CORRECT ANSWER Make sure it is calibrated and perform a manual smoke test" "The electrical current flowing in a circuit is measured in? - CORRECT ANSWER AMPS" "Resistance to the flow of electricity is measured in? - CORRECT ANSWER OHMS" "Materials that allow electric current to flow through them with little resistance are? - CORRECT ANSWER Conductors" "What is a good insulator at 120 volts but a good conductor at 10,000 volts? - CORRECT ANSWER Air" "Once a PCS motor starts? - CORRECT ANSWER The capacitor and windings remain in circuit while running" "The ECM (Electronically Commutated Motor) features? - CORRECT ANSWER Variable motor speed capabilities" "The primary control must be capable of reacting to? - CORRECT ANSWER The presence or absence of a flame" "When the light intensity on the cad cell increases, resistance? - CORRECT ANSWER Decreases" "Before pushing a reset button be sure to? - CORRECT ANSWER Check combustion chamber for excess oil" "We use Motor-Delay-Off (post-purge type technology) for? - CORRECT ANSWER Cleaner shutdowns" "The fan and limit control on a warm air furnace is used to control? - CORRECT ANSWER Shutoff the burner at a predetermined temperature, start the burner at a predetermined temperature, stop the burner at a predetermined temperature." "The control that shuts off the burner in the event of excessive temperature or pressure is? - CORRECT ANSWER High Limit Control" "The switching relays job is to? - CORRECT ANSWER Control a line voltage load with a low voltage thermostat" "In oil burner circuits the high limit must be? - CORRECT ANSWER Line voltage and wired in series with the primary control" "A reverse acting aquastat is used on a hydronic system to? - CORRECT ANSWER Stop the circulator when the boiler water temp falls below the setpoint" "The burner on a furnace will short cycle or regularly shut off on high limit if? - CORRECT ANSWER The air filters are dirty. Not enough air is being let through the heat exchanger." "For the correct operation of a hot water heating system it is essential to provide for? - CORRECT ANSWER Proper air elimination, proper pipe sizing, system water expansion" "Twelve pounds of pressure on a hot water boiler will push water up a pipe? - CORRECT ANSWER 28 FT 12X2.3=28" "The maximum steam pressure needed to operate a residential one pipe steam system is? - CORRECT ANSWER 2 PSI" "During a proper tune-up you should? - CORRECT ANSWER Check tank for water, take efficiency test, leave everything cleaner then you found it" "On an emergency midnight no-heat call, you press the reset button and the burner runs? - CORRECT ANSWER Begin your normal testing routine to determine why it shut off" "To minimize on-cycle heat loss? - CORRECT ANSWER Adjust the burner properly, keep heat exchanger clean, replace inefficient burners boiler or furnaces" "Increasing the amount of excess air? - CORRECT ANSWER Increases stack temp and decreases efficiency" "Off-cycle heat loss is much greater for older less efficient units then new high efficient ones because? - CORRECT ANSWER Older heat exchangers were wider, more likely to have air leaks, and needed more excess air" "Replacing an old inefficient burner with a mew high efficiency one reduces? - CORRECT ANSWER Off-cycle loss" "A heating unit that is closely matched in size to the buildings heating requirements will provide? - CORRECT ANSWER Lowest off-cycle heat loss and highest efficiency" "Infiltration loses are caused by? - CORRECT ANSWER Cold outside air drawn into building to replace warm air going up the chimney" "Isolated combustion air, whereby outdoor air is piped directly to the burner air intake? - CORRECT ANSWER Reduces air infiltration loses. Keeps burner air handling parts clean" What is the final adjustment you make when tuning up an oil burner? A)Draft B) Change Nozzle C)Oil Pressure D)Combustion Air - CORRECT ANSWER D)Combustion Air" "What is the effect of having a dirty burner squirrel cage fan? A)Water Hammer B)Incomplete combustion C)Low Co2 D)Blocked Chimney - CORRECT ANSWER B)Incomplete Combustion" "New burners produce "high static pressure" A)Produce more spark B)Push flue gases through tighter boilers C) Get better atomization - CORRECT ANSWER B)Push flue gases through tighter boilers" "Water oil in tanks is necessary because? A) Adds btu value B) Provides a place for bacteria to grow - CORRECT ANSWER B)Provides a place for bacteria to grow" "Water enters tanks through? A)Fill caps B)Vents C)Delivery truck D)All - CORRECT ANSWER D)All" "A "vent alarm" A)Tells delivery person when to stop B)Call tech when flame fails C)Signals when air vent is clogged - CORRECT ANSWER A)Tells delivery person when to stop" "The best way to clear a clogged oil line is to A)Turn the pump pressure up B)Use a Co2 cartridge C)Use a hand pump to suck the dirt out - CORRECT ANSWER C)Use a hand pump to suck the dirt out" "The vacuum expected on pump can be calculated by 1"hg for every foot of lift and 1" for every 10' run. NOTE: 1/2 for filter A) T B)F - CORRECT ANSWER A)T" "If there is an air leak in the oil suction line to a burner A)The ignitor will fail B)The flame may pulse C)Draft will increase - CORRECT ANSWER B)The flame may pulse" "A fuel de-aerator removes small amounts of sludge from the oil A)T B)F - CORRECT ANSWER B)F - it removes small amounts of air from the oil" "Nozzle after-drip can be caused by? A) Too large a nozzle B)Dirty Oil C)Air in the nozzle line >"cracked line" - CORRECT ANSWER C)Air in the nozzle line" "When will a barometric damper open wider? A)Hot summer day B)Cold winter day C)No wind day - CORRECT ANSWER B)Cold winter day (there is higher draft)" "When is a burner "over fired"? A)When the nozzle gph is too high B)When the pressure is too high C)When the stack temperature is too high D)All - CORRECT ANSWER D) All" "When is a power venter used? A)To ensure sufficient draft B) When horizontal venting C)On every installation - CORRECT ANSWER A)To ensure sufficient draft" "Co2 "red fluid" is good for how many tests? A)100 B)200 C)300 D)400 - CORRECT ANSWER B)200" "A Co2 test indicates A)Smoke B)Complete Combustion C)Excess Air D)Carbon Monoxide - CORRECT ANSWER C)Excess Air" "If you measure a 10% Co2 in the breech and a 12% over the fire, there must be an air leak in the boiler. A)T B)F - CORRECT ANSWER A)T" "Should a smoke test be done "before" or after using an electronic analyzer? - CORRECT ANSWER Before (so that you don't draw a lot of carbon into the sensitive electronic parts)" "Must heating appliances have their own branch circuit? A)Yes B)No - CORRECT ANSWER Yes" "If a thermostat has an anticipator, what should its setting match? A)Burner current B)Control current C)Ignitor current - CORRECT ANSWER B)Control (thermostat) current" "An E.C.M motor is just like a PSC has a start switch - CORRECT ANSWER Variable Speed" "What does post purge (motor off delay) help with? A)Clean startup B)Clean shutdown C)Forming good air pattern - CORRECT ANSWER B)Clean Shutdown" "A reverse acting aquastat A)Turns boiler off on temp increase B)Turns boiler on with temp increase C)Turns circulator off on water temp drop - CORRECT ANSWER Turns circulator off when boiler gets too cool" "What problems are created by a dirty furnace air filter? A)Indoor air pollution B)High stack temp C)Low supply air temp - CORRECT ANSWER High stack temp (less air over the heat exchanger)" "What is B5? A) 5% biofuel B)5% petroleum C)#5 Oil - CORRECT ANSWER 5% bio" "What is not a cause of positive breech draft? A)Blocked Chimney B)Dirty Fan C)Reduced vent size D)Too many flue pipe elbows - CORRECT ANSWER Dirty Fan" "What do you adjust to treat high draft? A)Air Shutter B)Chimney Height C)Draft Regulator D)Barometric Damper - CORRECT ANSWER Draft Regulator" "Fuel oil completely burns when lit with a match at the "flash point" temperature A)T B)F - CORRECT ANSWER B)F" "What will not help with "gelled oil tank"? A)Kerosene B)Chemical Treatment C)Added Water - CORRECT ANSWER Added Water" "A fuel pump's loose "cone valve" will cause pulsation of the flame? A)T B)F - CORRECT ANSWER A)T" "If run time increases, the "off-cycle loss" is likely to A)Increase B)Decrease C)Stay the same - CORRECT ANSWER Decrease" "What is a DPDT switch? - CORRECT ANSWER Double Pole Double Throw" "A "low limit" turns on the burner if the boiler gets too cool. A)T B)F - CORRECT ANSWER A)T" "Which does a "combination fan limit" control not do? A)Turn the furnace fan on B)Turn the furnace fan off C)Turn the burner off on high limit D)Turn the burner on at low limit - CORRECT ANSWER Turn the burner on at low limit" "Pre-purge is similar to A)Motor off delay B)Valve-on delay C)Lockout Timing - CORRECT ANSWER Valve-On Delay" "Normal cad cell ohms with flame is A)100 ohms B)500 ohms C)1600 ohms D)100,000 ohms - CORRECT ANSWER 500 ohms" "Steam system pressuretrols should be set to cutout at? A)1 psi B)5 psi C)15 psi - CORRECT ANSWER 1 psi" "A LWCO is a A)Thermostat B)Safety Control C) thermostatic element - CORRECT ANSWER Safety Control" "A circulator is best installed A) After the expansion tank B) Before the expansion tank C)On the return - CORRECT ANSWER After the expansion tank" "A low oxygen percentage means? A)High Co2 B)High Excess Air C)Low efficiency - CORRECT ANSWER High Co2" "modern flame retention head burner motors operate at what speed - CORRECT ANSWER 3450 rpm" "dirt or lint buildup in the bevel of the burner motor fan blades will cause what? - CORRECT ANSWER reduce the amount of combustion air" "what are the two types of burner motors? - CORRECT ANSWER split phase and permanent split capacitor" "what are the three basic parts of the fuel pump? - CORRECT ANSWER strainer, gear set, regulating valve" "the ignition transformer or igniter is one of the basic needs for what? - CORRECT ANSWER combustion" "the final key adjustment for most oil burners is what? - CORRECT ANSWER combustion air" "To change the air ratio for different firing rates with an adjustable head burner, what do we adjust - CORRECT ANSWER the position of the drawer assembly in the air tube" "one advantage to high static pressure burners is what? - CORRECT ANSWER more efficient heat exchangers (higher efficiency)" "All petroleum based products are based chemically on what elements? - CORRECT ANSWER hydrogen and carbon" "one gallon of heating oil contains how many BTU's? - CORRECT ANSWER 140,000" "A BTU is a measure of ______. - CORRECT ANSWER heat" "flash point is what? - CORRECT ANSWER lowest temp at which fuel will flash but not continue to burn" "what are the two common types of oil filters? - CORRECT ANSWER cartridge, spin-on" "oil filters fail when they become covered and blanketed with what? - CORRECT ANSWER biologically active slime/sludge" "the pour point of #2 oil can be lowered by what two methods? - CORRECT ANSWER kerosene and fuel additives" "what provides a home for bacterial growth at the bottom of an oil tank - CORRECT ANSWER water" "where does the bacteria live in an oil tank and what does it do? - CORRECT ANSWER lives in oil/water lines. eats oil and craps acid" "what are the three most common causes of water i. the oil tank - CORRECT ANSWER condensation, loose or missing vent caps, failing to drain water from tank before installation" "when installing an oil tank what three things should we do? - CORRECT ANSWER install an oil filter, vent alarm and tank gauge. make sure fill and vent lines are pitched back towards the tank" "when should we use compression fittings in an oil line - CORRECT ANSWER never" "what's the best way to clear a clogged oil line? - CORRECT ANSWER push-pull hand pump" "what three functions do oil pumps preform? - CORRECT ANSWER move oil from tank to burner, prevent dirt/sludge from clogging pump, remove air when piped as two-line system" "rule of thumb for calculating vacuum: - CORRECT ANSWER 1" for 1' vertical lift. 1" for 10' horizontal run" "the three purposes of an oil burner nozzle are to? - CORRECT ANSWER atomize the oil, provide pattern of oil spray, meter the amount of oil burned" "the flow rate stamped on the nozzle is based on what pump pressure? - CORRECT ANSWER 100 psi" "what can we do to reduce the effect of cold oil? - CORRECT ANSWER increase pressure and decrease nozzle size. install nozzle line pre-heater. use additives or kerosene." "what are the three main causes for after drip? - CORRECT ANSWER air in the nozzle line, a defective regulating valve, oil expansion in the nozzle" "the size of the nozzle and the oil pressure will determain what? - CORRECT ANSWER BTU input (firing rate)" "reflecting heat upon the flame vaporizes the oil droplets and helps... - CORRECT ANSWER the combustion process" "the flame coming in contact with the sides or back of the combustion chamber is called... - CORRECT ANSWER impingement" "what is the combustion chamber designed to do? - CORRECT ANSWER support the flame and heat up quickly" "thermal draft is caused by... - CORRECT ANSWER the pressure drop created by the hot combustion gasses rising in the chimney" "what causes currential draft? - CORRECT ANSWER wind passing over the chimney" "what factors effect draft? - CORRECT ANSWER fans, windows, closed spaces around burner" "what does draft drop through the heat exchanger indicate? - CORRECT ANSWER heavy soot and scale deposits in the heat exchanger" "the heat anticipator in the thermostat should be set to - CORRECT ANSWER the amperage draw of the control circuit" "when components of an igniter break down this effects what? - CORRECT ANSWER " "what are the 5 components that make up a split phase motor - CORRECT ANSWER rotor, stator, start winding, run winding, start switch" "when a split phase motor starts the centrifugal switch opens causing... - CORRECT ANSWER the start winding to disconnect" "the switch that opens when a split phase motor has almost reached full speed is called... - CORRECT ANSWER centrifugal switch" "if a split phase burner does not operate and the voltage to the motor is correct, you should first check... - CORRECT ANSWER the overload switch" "what is the advantage of a PSC motor over a split phase motor? - CORRECT ANSWER the use less current" "what remains in the circuit while the PSC motor starts - CORRECT ANSWER capacitor, auxiliary windings, main windings" "what motor has various speeds - CORRECT ANSWER ECM" "the primary control must be capable to reacting to what? - CORRECT ANSWER presence or absence of a flame" "what must the primary control have to activate the oil burner - CORRECT ANSWER high and low voltage 120V and 24V" "stack controls are capable of having - CORRECT ANSWER interrupted ignition" "the amount of time from start to lock out - CORRECT ANSWER trial for ignition" "what are the residential primary controls? - CORRECT ANSWER heat activated and light activated" "One advantage of high static pressure burners is? - CORRECT ANSWER Allows manufacturers to create tighter more efficient heat exchangers" "One gallon of #2 fuel oil contains approximately? - CORRECT ANSWER 140,000 BTU'S" "All petroleum products are chemical compounds of? - CORRECT ANSWER Carbon & Hydrogen" "The flash point of a fuel is an indication of? - CORRECT ANSWER The maximum temperature at which fuel can be stored safely and handled without a serious fire hazard. 100 degrees" "The ignition point of fuel is? - CORRECT ANSWER The lowest temperature at which rapid combustion of a fuel will take place. The point at which all fuel has been heated and vaporized. 500 degrees" "The pour point of #2 oil is? - CORRECT ANSWER The lowest point at which fuel will flow. 17 degrees" "As heating oil gets colder it's viscosity? - CORRECT ANSWER Increases" "Sulfuric acid in combustion gases can? - CORRECT ANSWER Create Sulfuric Trioxide which can react with the water vapor in the combustion gases to create a sulfuric acid aerosol which will scale up the heat exchanger" "The home for bacterial growth and sludge in the bottom of the oil tank is? - CORRECT ANSWER Water" "To insure clean, uncontaminated fuel reaches the oil burner? - CORRECT ANSWER Make sure to use a clean oil filter at the tank" "Water in oil tanks comes from? - CORRECT ANSWER Condensation, broken tank gauge, loose vent or fill fittings or missing caps, pumping old oil into new tank" "When installing an oil tank be sure? - CORRECT ANSWER Fill and vent are pitched downwards, install oil filter" "Oil lines buried in concrete should be? - CORRECT ANSWER Covered copper oil line" "Fuel units (oil pumps) perform the following function - CORRECT ANSWER Draw oil from the tank to the burner and pressurize the oil to 100 PSI or greater" "The best way to clear a clogged oil line is to? - CORRECT ANSWER Flush out the lines" "If the oil level in the tank is 4' below the fuel unit and 10' away the approximate vacuum should be? - CORRECT ANSWER 5" of vacuum 1" for every 1' rise plus 1" for every 10' run" "If the operating vacuum reading is significantly above the calculated vacuum you probably have a? - CORRECT ANSWER Plugged fuel filter, kinked oil supply line or a partially closed oil supply valve" "If the operating vacuum is significantly less then the calculated vacuum you probably have a? - CORRECT ANSWER Air leak in the suction line" "It is best to connect fuel units as a one-pipe system instead of two-pipe because? - CORRECT ANSWER Two pipe systems filter the oil several times causing the filter to clog faster" "A fuel de-aerator? - CORRECT ANSWER Reduces air in oil by eliminating the need for a 2 pipe system" "A cause of pulsating oil pump pressure and a pulsating fire is? - CORRECT ANSWER Partially clogged filter/strainer or an air leak" "Increasing the fuel pump pressure will? - CORRECT ANSWER Increase flow rate and increase atomization" "The purpose of a oil burner nozzle is to? - CORRECT ANSWER Atomize, meter and set a spray pattern for the fuel" "When replacing a nozzle? - CORRECT ANSWER Always follow manufacturers recommendations. Always handle carefully and touch as little as possible" "To reduce combustion problems caused by cold oil? - CORRECT ANSWER Increase pump pressure, nozzle line preheater or blend kerosine or additives with fuel" "Nozzle after-drip can be caused by? - CORRECT ANSWER A defective pump shutoff valve, air entrapped in nozzle line, oil expansion in nozzle caused by exsessive radiant heat" "The flow rate stamped on the nozzle is based on? - CORRECT ANSWER 100 PSI pumps" "A proper combustion chamber? - CORRECT ANSWER Must be made of the proper material and properly sized" "Too much draft over the fire can occur when? - CORRECT ANSWER The draft regulator is sealed shut" "Thermal draft is created by? - CORRECT ANSWER The air in the chimney being hotter then the air outside" "Chimney draft is affected by? - CORRECT ANSWER Outside temperature, humidity, wind" "At steady state we find a typical draft of -.01 to -.02" of water column.... - CORRECT ANSWER Over the fire" "A device the uses electricity to perform useful work is a? - CORRECT ANSWER Load" "An electrical circuit for an oil burner will contain? - CORRECT ANSWER A conductor of the power source to the burner and back to the power source. Loads and switches" "In a series circuit there is only one? - CORRECT ANSWER Path for current through the loads." "Oil heating systems should be? - CORRECT ANSWER Wired on their own circuit" "The heat anticipator in a thermostat should be set to? - CORRECT ANSWER The amperage draw of the control circuit" "A thermostat with a single pole single throw switch that closes on temperature fall is? - CORRECT ANSWER A heating thermostat" "A voltmeter? - CORRECT ANSWER Can be used on a live circuit because it allows very little amperage to flow through it" "The clamp-on ammeter? - CORRECT ANSWER Converts the strength of the magnetic field surrounding the wire into an amp reading" "If a pumps gears are partially frozen and difficult to turn, it could cause? - CORRECT ANSWER Increase in amperage" "When using an ohmmeter? - CORRECT ANSWER Disconnect hot and neutral wires and discharge any capacitors" "When an ignition system is energized only until flame is established, it is called? - CORRECT ANSWER Interrupted ignition" "Energizing the ignition circuit during the entire burn cycle, is called? - CORRECT ANSWER Intermittent ignition" "Igniters are better then ignition transformers because? - CORRECT ANSWER Higher output voltage and they use less electricity" "The switch that opens when a split phase motor has almost reached full speed is? - CORRECT ANSWER Start switch" "If a split phase burner motor does not operate and the voltage to the motor is correct, you should first check? - CORRECT ANSWER The overload switch" "We use capacitor start motors because? - CORRECT ANSWER They provide greater starting torque" "Before using an ohmmeter to test a capacitor start motor you should? - CORRECT ANSWER Discharge the capacitor" "An advantage of PCS motors over conventional split phase motors is they? - CORRECT ANSWER Use less current"