Chapter 91 - Oil Burners for Heating Boilers Questions and Answers correct

Chapter 91 - Oil Burners for Heating Boilers Questions and Answers correct d *Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately: A 10 kPa B 15 kPa C 80 kPa D 35 kPa E 70 kPa a Which of the following is NOT a type of oil burner? A Atmospheric burners B Steam atomizing burners C Mechanical or pressure atomizing burners D Centrifugal or rotary cup burners E Air atomizing burners b A modulating pressure atomizer has its return oil flow regulated by: A A modulating valve to the burner B A modulating valve in the return line C A solenoid valve in the return line D A pressure regulator E Pump speed b 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 c Regulations require that the minimum distance between an oil-fired furnace and an indoor oil storage tank must be: A 7 m B 5.2 m C 2.1 m D 4.7 m E 9.8 m e An air atomizing burner utilizes an air pressure of approximately: A 15 kPa B 150 kPa C 75 kPa D 95 kPa E 100 kPa a To which of the following oil burners is the oil supplied under high pressure? A Mechanical atomizing burner B Air atomizing burner C Rotary cup burner D Steam atomizing burner E Multi-spud burner b Before being pumped to the burner, heavy oils are heated to approximately: A 203°C B 95°C C 115°C D 75°C E 150°C d A multi-burner cluster has secondary and tertiary nozzles ignited by: A An igniter spark B An intermittent pilot flame C An interrupted pilot D The primary burner E A continuous pilot e 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 slower boiler warm-ups b When a greater than normal amount of combustible mixture is ignited, the result may be: A A boiler explosion B A puff-back C A negative furnace pressure D A too rapid boiler warm-up E Liquid fuel entering the furnace c 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(s). A Pre-heated B Post-heated C Purged D Cooled E Pressurized b The two basic varieties of mechanical atomizing oil burners are the: A Variable capacity and modulating burners B Constant and variable capacity burners C Modulating and cluster burners D Rotary and reciprocating cup burners E light oil and heavy oil burners b The compressed air used as atomizing air in the air atomizing oil burner is also called: A Secondary air B Primary air C Pre-mixed air D Combustion air E Post-compressed air d The pressure range for pressure-atomizing burners fired with light fuel oil is approximately: 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 e The design 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 c 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 d An atomizing air compressor is usually: A A variable displacement type B A centrifugal type C An axial type D A small, rotary air compressor E A regenerative type d The reducing of oil into very small particles is termed A fluidization B fractionation C turbulence D atomization E distillation a Oil burners can be divided into three classes: 1. air and steam atomizing burners 2. mechanical or pressure atomizing burners 3. centrifugal or rotary cup burners 4. atmospherical pressure burners 5. gravitational pressure burners A 1, 2, and 3 B 1, 2, and 4 C 2, 3, and 4 D 3, 4, and 5 E 2, 3, and 5 b A relief valve is placed on the discharge of a fuel oil pump A because the pump is a dynamic type B so burner design pressure is not exceeded C so burner capacity is maintained D to prevent pump rupture E to prevent over-firing of the boiler b A time delay oil valve A opens when the pump starts B opens once ignition is verified C opens on flame failure D is located on the return line E is upstream of the pressure regulating valve d An air atomizing compressor is usually A a variable displacement type B a centrifugal type C an axial type D a positive displacement type E a regenerative type c A modulating capacity mechanical atomizing oil burner is also called an? A Constant capacity B Steam atomized C Wide range atomizer D Centrifugal Cup b The purpose of pressure relief valve on a constant capacity fuel supply is to: A Relieve the pressure from the oil line any discharge it to atmosphere B Re-direct fuel oil that above the set pressure back to the tank or strainer C Protect the oil tank from rupturing D All the above a The purpose of a cut off valve is to: A Prevents too low of an oil pressure to supply the burner B Cut off the burner is to high C Relieve the pressure of the fuel in an over-pressure situation D None of the above