HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
1. Regarding heat pumps, suction line accumulators are receivers
used as what for excess refrigerant
2. a gas meter must be located how many feet from the 3
suction line
3. what reduces the capacity of a refrigerant compressor compressor unloader
4. regarding gas heating, for combustion to take place 4%
with natural gas, the mixture must be from 4% to 14%
gas and 96% to 86% air. An amount of gas less than
_______ would be too lean
5. what should the draft reading over the fire be for negative .02
flame retention, residential oil burner
6. what valve is set at the adjustable heat anticipator on the amp flow reading of
a gas thermostat the control circuit
7. which is not true of a water cooled chiller system mostly used in residential
systems
8. a puff back that is caused by an accumulation of air-oil explosion
mixture in the combustion chamber that is ignited
either a late spark or the hot refractory material
9. the voltage to a residential thermostat 24
10. how far from a fuel oil burner must an electrode panel 3'
be
11. regarding heat pumps, two ______ devices are used expansion
12. brace
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
a ____ is a rigid connection that holds one scaffold
member in a fixed position with respect to another
member, or building structure
13. on a 208 volt meter the lowest allowable input voltage 187.2
is
14. what pressure is liquified petrolium gas fed to the 11" Wc
burner
15. in reference to cooling tower sump water, what is the 70-80 F
ideal temp to test PH
16. unloaders are used to balance the ______ on a run cycle load
17. T or F Copper water tube hydronic boilers has the true
lowest terminal mass per btu/hr
18. what is the max distance an ultraviolet scanner may 18 inches
be placed from the flame
19. what is the net free air in square inches of a 12" x 12" 108
metal louver opening. (formula = total area x 75%)
20. hot gas bypass is used to _____ an evaporator coil defrost
21. what is an A type vent made of masonry
22. in a cascade refrigerating system two or more refrig- condenser
erating systems are connected. One evaporator coil
cools the next _____
23. modern day residential oil burner motors operate at 3450
how many rpms
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
24. hard drawn copper tubing should not be bent
25. a chimney for a residential low heat utilization equip- 3 feet
ment shall extend at least
26. What does M.A.W.P. stand for maximum allowable work-
ing pressure
27. in a confined space the upper opening supplying com- 12 inches
bustion air to fuel burning appliance must be a maxi-
mum of _______ from the ceiling
28. what gauge of wire goes to an oil burner 14 gauge
29. T or F An unbalanced duct can cause noise and vibra- true
tion
30. a _____ person is someone who is able to identify exist- competent
ing and predictable hazards in the surrounding area
or working conditions that are unsanitary, dangerous,
or hazardous to employees
31. to eliminate noise and vibration to critical rooms you flex connector between
should duct and fan
32. T or F A respirator does not need to be worn when true
adding sulfuric acid chromate solution to prevent scal-
ing in a cooling tower
33. what is the maximum length of a horizontal chimney 10 feet
connector
34. _____ for ac and heat pumps can be temperature initi- defrost controls
ated/temperature terminated
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
35. flame retention head oil burners usually run at how 3450
many rpms
36. what is the flash point of #6 fuel oil 140 degrees F
37. a hole is required for piping 4 inches from the bottom 3 inches
of a 2x10 joist that's 12 feet long, the hole is 2 feet
from the end of the joist, the hole is 2 feet from the
end of the joist. the maximum allowable size for the
hole is what
38. how are copper joints made when embedded in a brazed joints
subsurface floor
39. when heating pipe is put in the ground what is used 6 mil polyethylene
to keep heat from transferring into the ground
40. a ____ is a design of straps which may be secured body harness
about the employee in a manner to distribute the fall
arrest forces of over at least the thighs, pelvis, waist,
chest and shoulders with means for attaching it to
other components of a personal fall arrest system.
41. what is the purpose of the equalizing line on a ther- compensates for loss of
mostatic expansion valve pressure in the evaporator
42. what is the purpose of the drip leg in a gas line collects condensate
43. what size pocket depth is standard for button strap 1/2 inch
lock when applied to 24 gauge sheet metal
44. the maximum size of an oil supply line shall be A+B
45. forces
Study online at https://quizlet.com/_f2o656
1. Regarding heat pumps, suction line accumulators are receivers
used as what for excess refrigerant
2. a gas meter must be located how many feet from the 3
suction line
3. what reduces the capacity of a refrigerant compressor compressor unloader
4. regarding gas heating, for combustion to take place 4%
with natural gas, the mixture must be from 4% to 14%
gas and 96% to 86% air. An amount of gas less than
_______ would be too lean
5. what should the draft reading over the fire be for negative .02
flame retention, residential oil burner
6. what valve is set at the adjustable heat anticipator on the amp flow reading of
a gas thermostat the control circuit
7. which is not true of a water cooled chiller system mostly used in residential
systems
8. a puff back that is caused by an accumulation of air-oil explosion
mixture in the combustion chamber that is ignited
either a late spark or the hot refractory material
9. the voltage to a residential thermostat 24
10. how far from a fuel oil burner must an electrode panel 3'
be
11. regarding heat pumps, two ______ devices are used expansion
12. brace
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
a ____ is a rigid connection that holds one scaffold
member in a fixed position with respect to another
member, or building structure
13. on a 208 volt meter the lowest allowable input voltage 187.2
is
14. what pressure is liquified petrolium gas fed to the 11" Wc
burner
15. in reference to cooling tower sump water, what is the 70-80 F
ideal temp to test PH
16. unloaders are used to balance the ______ on a run cycle load
17. T or F Copper water tube hydronic boilers has the true
lowest terminal mass per btu/hr
18. what is the max distance an ultraviolet scanner may 18 inches
be placed from the flame
19. what is the net free air in square inches of a 12" x 12" 108
metal louver opening. (formula = total area x 75%)
20. hot gas bypass is used to _____ an evaporator coil defrost
21. what is an A type vent made of masonry
22. in a cascade refrigerating system two or more refrig- condenser
erating systems are connected. One evaporator coil
cools the next _____
23. modern day residential oil burner motors operate at 3450
how many rpms
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
24. hard drawn copper tubing should not be bent
25. a chimney for a residential low heat utilization equip- 3 feet
ment shall extend at least
26. What does M.A.W.P. stand for maximum allowable work-
ing pressure
27. in a confined space the upper opening supplying com- 12 inches
bustion air to fuel burning appliance must be a maxi-
mum of _______ from the ceiling
28. what gauge of wire goes to an oil burner 14 gauge
29. T or F An unbalanced duct can cause noise and vibra- true
tion
30. a _____ person is someone who is able to identify exist- competent
ing and predictable hazards in the surrounding area
or working conditions that are unsanitary, dangerous,
or hazardous to employees
31. to eliminate noise and vibration to critical rooms you flex connector between
should duct and fan
32. T or F A respirator does not need to be worn when true
adding sulfuric acid chromate solution to prevent scal-
ing in a cooling tower
33. what is the maximum length of a horizontal chimney 10 feet
connector
34. _____ for ac and heat pumps can be temperature initi- defrost controls
ated/temperature terminated
, HVAC D2 License Test Questions
Study online at https://quizlet.com/_f2o656
35. flame retention head oil burners usually run at how 3450
many rpms
36. what is the flash point of #6 fuel oil 140 degrees F
37. a hole is required for piping 4 inches from the bottom 3 inches
of a 2x10 joist that's 12 feet long, the hole is 2 feet
from the end of the joist, the hole is 2 feet from the
end of the joist. the maximum allowable size for the
hole is what
38. how are copper joints made when embedded in a brazed joints
subsurface floor
39. when heating pipe is put in the ground what is used 6 mil polyethylene
to keep heat from transferring into the ground
40. a ____ is a design of straps which may be secured body harness
about the employee in a manner to distribute the fall
arrest forces of over at least the thighs, pelvis, waist,
chest and shoulders with means for attaching it to
other components of a personal fall arrest system.
41. what is the purpose of the equalizing line on a ther- compensates for loss of
mostatic expansion valve pressure in the evaporator
42. what is the purpose of the drip leg in a gas line collects condensate
43. what size pocket depth is standard for button strap 1/2 inch
lock when applied to 24 gauge sheet metal
44. the maximum size of an oil supply line shall be A+B
45. forces
