Oil burner's test Questions 1-200 and Answers verified

Oil burner's test Questions 1-200 and Answers verified 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 The draft over the fire The proper location to install a draft inducer is •In the flue pipe between the draft regulator and the chimney Using combustion test instruments to measure the composition and temperature of the flue gas as they leave the heating unit will indicate the Steady state efficiency The holes that are provided in the flue pipe for combustion testing must be •Between the heating unit and the draft regulator When using a pump type smoke tester, ten full strokes are necessary to •Draw the proper amount of flue gas past the paper The fluid in a CO2 tester is good for about how many tests? For about 400 tests When applying current through a conductor that is wound in coil, the magnetic lines of force created are used in •Solenoid valve . Relay .Electric Motor If in an average 15-amp residential heating circuit, the fuse occasionally blows, you should Install a 15-amp breaker To determine the "electrical potential" available at any given point in a circuit you should use a: Voltmeter Oil burner ignition systems normally operate at what primary voltage 120 volts Oil burner ignition transformers operate at what secondary voltage range 10,000 to 14,000 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 47. 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 49. 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 In most residential hot water heating systems, the design temperature difference between the supply and return water is 20F What is used to prevent gravity circulation through the system when the boiler maintains temperature Flow control valve Turbulators in the tubes of a fire tube boiler: Increase efficiency In a forced warm air system, the return air duct size should never be less than ____ of the supply air duct size. 100% On a cold day, the burner is cycling on and off, the flame is sufficient but the complaint of insufficien1 heat may be caused by •Faulty or improperly set high limit •.Thermostat set in the wrong location • Boiler or furnace too small Short cycling of the burner can be caused by •The heat anticipator not set properly • High limit set too low . Oversized equipment The proper location for the vacuum gauge when testing a fuel unit and supply line is •A suction port One reason oil would drip from the nozzle after the burner shuts down is •A faulty fuel unit cut-off On a burner that has been properly set up and adjusted, yet will experience an occasional hard start or puff back, the problem may be The nozzle is too large Off-cycle heat losses include Chimney draft and Jacket loss 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