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CHAPTER 91 - OIL BURNERS FOR
HEATING BOILERS EXAM | QUESTIONS &
ANSWERS (VERIFIED) | LATEST UPDATE |
GRADED A+
Before atomization can occur, heavy oils are heated to approx. a. 203 deg. C b. 95 deg. C c. 115 deg. C d. 75 deg. C e. 150 deg. C Correct answer: b. 95 deg. C The air atomizing oil burner is commonly used on: a. industrial sized boilers b. domestic hot water boilers c. small residential boilers d. larger packaged boilers e. small tubular boilers Correct answer: d. larger packaged boilers
Maximum static pressure in a fuel oil line from a fuel tank is approximately: a. 10 kPa b. 15 kPa c. 80 kPa d. 35 kPa e. 70 kPa Correct answer: e. 70 kPa When heat demand is very low, the Two Fixed Capacity Burner system will: a. cycle the primary burner b. cycle the secondary burner c. stop the secondary fuel pump d. close the primary solenoid valve e. close the return valve Correct answer: a. cycle the primary burner The capacity of a constant capacity mechanical atomizer is a function of: a. orifice size b. pump speed c. pump size d. supply pressure e. oil viscosity Correct answer: a. orifice size
Correct answer: b. opens 5-15 seconds after the igniter has started The minimum distance from furnace to oil storage tank is: a. 7 m b. 5.2 m c. 2.1 m d. 4.7 m e. 0.6 m Correct answer: e. 0.6 m The reducing of oil into very small particles is termed: a. fluidization b. fractionation c. turbulence d. atomization e. distillation Correct answer: d. atomization In an oil burner with 3 fixed capacity nozzles, the intermediate and high fire burner nozzles have higher capacities than the primary burner nozzle: a. to give greater firing variations b. to prevent pressure surges c. to prevent ignition puff-backs
d. because of the pump being of the positive displacement type e. to allow better boiler warm-ups Correct answer: e. to allow better boiler warm-ups What do electric ignition transformers step up the supply voltage to approximately? a. 100 - 120 volts b. 100 - 120 millivolts c. 100000 - 120000 volts d. 1000 - 1200 volts e. 10000 - 12000 volts Correct answer: e. 10000 - 12000 volts The part of an air atomizing burner that imparts a turning motion to the oil is the: a. swirler b. orifice c. body d. strainer e. spring Correct answer: a. swirler Which of the following is not a type of oil burner a. atmospheric b. steam atomizing burners
a. 50 to 100 kPa b. 150 to 250 kPa c. 300 to 550 kPa d. 550 to 700 kPa e. 700 to 850 kPa Correct answer: d. 550 to 700 kPa When using mechanical fuel oil atomization: a. 70 kPa steam pressure is required at the burner b. dry saturated steam or superheated steam should be used c. high pump pressure is required d. steam pressure is required to keep the bypass open e. 35 to 40 kPa oil pressure is required Correct answer: c. high pump pressure is required A time delay oil valve: a. opens when the oil pump starts b. opens 5 to 15 seconds after ignition begins c. opens on flame failure d. is located on the return line e. is upstream of the pressure regulating valve Correct answer: b. opens 5 to 15 seconds after ignition begins
To prevent the possibility of a furnace explosion, it is important that the furnace is ___ before the igniter is energized and fuel is supplied to the burner nozzle: a. pre-heated b. post-heated c. purged d. cooled e. pressurized Correct answer: c. purged
