OBT-3 Mohawk Exam
Study online at https://quizlet.com/_ao8rtd
1. When fuel oil temperature is re- Increase
duced, the fuel oil viscosity will
______________________________________________________.
2. True or False? Carbon dioxide and nitrogen are not FALSE
inert gases.
3. The temperature of the fuel can affect Soot formation, flow rate
_________________________________________________. and viscosity, droplet size
(all choices listed)
4. The droplet size of atomized fuel oil Decreases
________________________________________________ as oil
pump pressure increases.
5. The flue gases of properly burnt fuel oil (complete CO2, H2O, N2, excess air
combustion) and excess air contain and heat
_________________________________________________________________
6. Two general categories of refined fuel oils are Distillates and residuals
_____________________ and _________________________.
7. Viscosity is the tendency of a fluid to Resist flowing
_________________________________________________.
8. True or False? The most common grade of fuel oil used FALSE
in residential appliances is #4 fuel oil
9. True or False? An OBT must assess the condition of a True
combustion chamber when the firing rate or nozzle
angle and pattern are changed on a burner.
10. Prior to starting a fuel oil pump, it must be filled with Oil
______________________________.
, OBT-3 Mohawk Exam
Study online at https://quizlet.com/_ao8rtd
11. High pressure fuel oil is delivered to an at- Pump
omizing type oil nozzle by using a fuel oil
_________________________________.
12. Air that is in the oil line piping, oil filter or oil pump Bleed
can be removed at the oil pump by opening the
_____________________ port of the fuel pump while the
pump is runnin
13. Higher nozzle oil pressure may be achieved by Adjusting the regulator
________________________________________________________________________
spring tension at the oil
pump
14. The spray angle range for a high-pressure oil nozzle is 30 & 90
between _______ and _______ degrees.
15. When oil enters the swirl chamber of an oil nozzle, its Decreases
spray velocity increases and its pressure
___________________________________________________________
16. Increasing Pump pressure
______________________________________________________
will increase the nozzle firing rate.
17. ________________________________________ affects nozzle Fuel pump pressure
spray size.
18. The typical electrode gap setting is _________". 1/8
19. The essential gauges used when testing the operation Pressure and vacuum
of an oil fuel pump [fuel unit] are ____________________
and _______________________ gauges.
Study online at https://quizlet.com/_ao8rtd
1. When fuel oil temperature is re- Increase
duced, the fuel oil viscosity will
______________________________________________________.
2. True or False? Carbon dioxide and nitrogen are not FALSE
inert gases.
3. The temperature of the fuel can affect Soot formation, flow rate
_________________________________________________. and viscosity, droplet size
(all choices listed)
4. The droplet size of atomized fuel oil Decreases
________________________________________________ as oil
pump pressure increases.
5. The flue gases of properly burnt fuel oil (complete CO2, H2O, N2, excess air
combustion) and excess air contain and heat
_________________________________________________________________
6. Two general categories of refined fuel oils are Distillates and residuals
_____________________ and _________________________.
7. Viscosity is the tendency of a fluid to Resist flowing
_________________________________________________.
8. True or False? The most common grade of fuel oil used FALSE
in residential appliances is #4 fuel oil
9. True or False? An OBT must assess the condition of a True
combustion chamber when the firing rate or nozzle
angle and pattern are changed on a burner.
10. Prior to starting a fuel oil pump, it must be filled with Oil
______________________________.
, OBT-3 Mohawk Exam
Study online at https://quizlet.com/_ao8rtd
11. High pressure fuel oil is delivered to an at- Pump
omizing type oil nozzle by using a fuel oil
_________________________________.
12. Air that is in the oil line piping, oil filter or oil pump Bleed
can be removed at the oil pump by opening the
_____________________ port of the fuel pump while the
pump is runnin
13. Higher nozzle oil pressure may be achieved by Adjusting the regulator
________________________________________________________________________
spring tension at the oil
pump
14. The spray angle range for a high-pressure oil nozzle is 30 & 90
between _______ and _______ degrees.
15. When oil enters the swirl chamber of an oil nozzle, its Decreases
spray velocity increases and its pressure
___________________________________________________________
16. Increasing Pump pressure
______________________________________________________
will increase the nozzle firing rate.
17. ________________________________________ affects nozzle Fuel pump pressure
spray size.
18. The typical electrode gap setting is _________". 1/8
19. The essential gauges used when testing the operation Pressure and vacuum
of an oil fuel pump [fuel unit] are ____________________
and _______________________ gauges.
