HVAC D2 License Test Questions with All Correct &
100% Verified Answers |Actual Complete Exam|
Already Graded A+
Regarding heat pumps, suction line accumulators are used as what for excess refrigerant ✔Correct
Answer-receivers
a gas meter must be located how many feet from the suction line ✔Correct Answer-3
what reduces the capacity of a refrigerant compressor ✔Correct Answer-compressor unloader
regarding gas heating, for combustion to take place 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 ✔Correct
Answer-4%
what should the draft reading over the fire be for flame retention, residential oil burner ✔Correct
Answer-negative .02
what valve is set at the adjustable heat anticipator on a gas thermostat ✔Correct Answer-the
amp flow reading of the control circuit
which is not true of a water cooled chiller system ✔Correct Answer-mostly used in residential
systems
a puff back that is caused by an accumulation of air-oil mixture in the combustion chamber that is
ignited either a late spark or the hot refractory material ✔Correct Answer-explosion
the voltage to a residential thermostat ✔Correct Answer-24
how far from a fuel oil burner must an electrode panel be ✔Correct Answer-3'
regarding heat pumps, two ______ devices are used ✔Correct Answer-expansion
a ____ is a rigid connection that holds one scaffold member in a fixed position with respect to
another member, or building structure ✔Correct Answer-brace
on a 208 volt meter the lowest allowable input voltage is ✔Correct Answer-187.2
what pressure is liquified petrolium gas fed to the burner ✔Correct Answer-11" Wc
in reference to cooling tower sump water, what is the ideal temp to test PH ✔Correct Answer-70-
80 F
unloaders are used to balance the ______ on a run cycle ✔Correct Answer-load
,T or F Copper water tube hydronic boilers has the lowest terminal mass per btu/hr ✔Correct
Answer-true
what is the max distance an ultraviolet scanner may be placed from the flame ✔Correct Answer-
18 inches
what is the net free air in square inches of a 12" x 12" metal louver opening. (formula = total area x
75%) ✔Correct Answer-108
hot gas bypass is used to _____ an evaporator coil ✔Correct Answer-defrost
what is an A type vent made of ✔Correct Answer-masonry
in a cascade refrigerating system two or more refrigerating systems are connected. One evaporator
coil cools the next _____ ✔Correct Answer-condenser
modern day residential oil burner motors operate at how many rpms ✔Correct Answer-3450
hard drawn copper tubing should not be ✔Correct Answer-bent
a chimney for a residential low heat utilization equipment shall extend at least ✔Correct Answer-
3 feet
What does M.A.W.P. stand for ✔Correct Answer-maximum allowable working pressure
in a confined space the upper opening supplying combustion air to fuel burning appliance must be a
maximum of _______ from the ceiling ✔Correct Answer-12 inches
what gauge of wire goes to an oil burner ✔Correct Answer-14 gauge
T or F An unbalanced duct can cause noise and vibration ✔Correct Answer-true
a _____ person is someone who is able to identify existing and predictable hazards in the
surrounding area or working conditions that are unsanitary, dangerous, or hazardous to employees
✔Correct Answer-competent
to eliminate noise and vibration to critical rooms you should ✔Correct Answer-flex connector
between duct and fan
T or F A respirator does not need to be worn when adding sulfuric acid chromate solution to prevent
scaling in a cooling tower ✔Correct Answer-true
what is the maximum length of a horizontal chimney connector ✔Correct Answer-10 feet
_____ for ac and heat pumps can be temperature initiated/temperature terminated ✔Correct
Answer-defrost controls
flame retention head oil burners usually run at how many rpms ✔Correct Answer-3450
, what is the flash point of #6 fuel oil ✔Correct Answer-140 degrees F
a hole is required for piping 4 inches from the bottom 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 ✔Correct Answer-3 inches
how are copper joints made when embedded in a subsurface floor ✔Correct Answer-brazed
joints
when heating pipe is put in the ground what is used to keep heat from transferring into the ground
✔Correct Answer-6 mil polyethylene
a ____ is a design of straps which may be secured 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. ✔Correct Answer-body harness
what is the purpose of the equalizing line on a thermostatic expansion valve ✔Correct Answer-
compensates for loss of pressure in the evaporator
what is the purpose of the drip leg in a gas line ✔Correct Answer-collects condensate
what size pocket depth is standard for button strap lock when applied to 24 gauge sheet metal
✔Correct Answer-1/2 inch
the maximum size of an oil supply line shall be ✔Correct Answer-A+B
force draft combustion blowers ________ air into the combustion chamber ✔Correct Answer-
forces
T or F An unused NFPA 54 (EHD) stands for Equivalent hydraulic diameter ✔Correct Answer-true
fuel oil begins to come apart when subjected to a vacuum in excess of what ✔Correct Answer-10
inches h.g.
what material is not to be used to vent low heat appliances ✔Correct Answer-masonry
appliances located how many feet above the floor level should be provided with approved
permanent means of access ✔Correct Answer-16
where must the draft control device be installed if the location is not specified by the appliance
manufacturers instructions ✔Correct Answer-attached to the flue collar of the equipment or as
near to the equipment as practical
T or F when testing an air cooled condenser for leaks removing all refrigerant from the system before
leak testing is NOT an option ✔Correct Answer-true
what is the minimum test pressure of a 0.5 psi gas system ✔Correct Answer-3
what must be provided when flame sensing detectors can fail in the flame proven mode ✔Correct
Answer-self checking feature
100% Verified Answers |Actual Complete Exam|
Already Graded A+
Regarding heat pumps, suction line accumulators are used as what for excess refrigerant ✔Correct
Answer-receivers
a gas meter must be located how many feet from the suction line ✔Correct Answer-3
what reduces the capacity of a refrigerant compressor ✔Correct Answer-compressor unloader
regarding gas heating, for combustion to take place 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 ✔Correct
Answer-4%
what should the draft reading over the fire be for flame retention, residential oil burner ✔Correct
Answer-negative .02
what valve is set at the adjustable heat anticipator on a gas thermostat ✔Correct Answer-the
amp flow reading of the control circuit
which is not true of a water cooled chiller system ✔Correct Answer-mostly used in residential
systems
a puff back that is caused by an accumulation of air-oil mixture in the combustion chamber that is
ignited either a late spark or the hot refractory material ✔Correct Answer-explosion
the voltage to a residential thermostat ✔Correct Answer-24
how far from a fuel oil burner must an electrode panel be ✔Correct Answer-3'
regarding heat pumps, two ______ devices are used ✔Correct Answer-expansion
a ____ is a rigid connection that holds one scaffold member in a fixed position with respect to
another member, or building structure ✔Correct Answer-brace
on a 208 volt meter the lowest allowable input voltage is ✔Correct Answer-187.2
what pressure is liquified petrolium gas fed to the burner ✔Correct Answer-11" Wc
in reference to cooling tower sump water, what is the ideal temp to test PH ✔Correct Answer-70-
80 F
unloaders are used to balance the ______ on a run cycle ✔Correct Answer-load
,T or F Copper water tube hydronic boilers has the lowest terminal mass per btu/hr ✔Correct
Answer-true
what is the max distance an ultraviolet scanner may be placed from the flame ✔Correct Answer-
18 inches
what is the net free air in square inches of a 12" x 12" metal louver opening. (formula = total area x
75%) ✔Correct Answer-108
hot gas bypass is used to _____ an evaporator coil ✔Correct Answer-defrost
what is an A type vent made of ✔Correct Answer-masonry
in a cascade refrigerating system two or more refrigerating systems are connected. One evaporator
coil cools the next _____ ✔Correct Answer-condenser
modern day residential oil burner motors operate at how many rpms ✔Correct Answer-3450
hard drawn copper tubing should not be ✔Correct Answer-bent
a chimney for a residential low heat utilization equipment shall extend at least ✔Correct Answer-
3 feet
What does M.A.W.P. stand for ✔Correct Answer-maximum allowable working pressure
in a confined space the upper opening supplying combustion air to fuel burning appliance must be a
maximum of _______ from the ceiling ✔Correct Answer-12 inches
what gauge of wire goes to an oil burner ✔Correct Answer-14 gauge
T or F An unbalanced duct can cause noise and vibration ✔Correct Answer-true
a _____ person is someone who is able to identify existing and predictable hazards in the
surrounding area or working conditions that are unsanitary, dangerous, or hazardous to employees
✔Correct Answer-competent
to eliminate noise and vibration to critical rooms you should ✔Correct Answer-flex connector
between duct and fan
T or F A respirator does not need to be worn when adding sulfuric acid chromate solution to prevent
scaling in a cooling tower ✔Correct Answer-true
what is the maximum length of a horizontal chimney connector ✔Correct Answer-10 feet
_____ for ac and heat pumps can be temperature initiated/temperature terminated ✔Correct
Answer-defrost controls
flame retention head oil burners usually run at how many rpms ✔Correct Answer-3450
, what is the flash point of #6 fuel oil ✔Correct Answer-140 degrees F
a hole is required for piping 4 inches from the bottom 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 ✔Correct Answer-3 inches
how are copper joints made when embedded in a subsurface floor ✔Correct Answer-brazed
joints
when heating pipe is put in the ground what is used to keep heat from transferring into the ground
✔Correct Answer-6 mil polyethylene
a ____ is a design of straps which may be secured 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. ✔Correct Answer-body harness
what is the purpose of the equalizing line on a thermostatic expansion valve ✔Correct Answer-
compensates for loss of pressure in the evaporator
what is the purpose of the drip leg in a gas line ✔Correct Answer-collects condensate
what size pocket depth is standard for button strap lock when applied to 24 gauge sheet metal
✔Correct Answer-1/2 inch
the maximum size of an oil supply line shall be ✔Correct Answer-A+B
force draft combustion blowers ________ air into the combustion chamber ✔Correct Answer-
forces
T or F An unused NFPA 54 (EHD) stands for Equivalent hydraulic diameter ✔Correct Answer-true
fuel oil begins to come apart when subjected to a vacuum in excess of what ✔Correct Answer-10
inches h.g.
what material is not to be used to vent low heat appliances ✔Correct Answer-masonry
appliances located how many feet above the floor level should be provided with approved
permanent means of access ✔Correct Answer-16
where must the draft control device be installed if the location is not specified by the appliance
manufacturers instructions ✔Correct Answer-attached to the flue collar of the equipment or as
near to the equipment as practical
T or F when testing an air cooled condenser for leaks removing all refrigerant from the system before
leak testing is NOT an option ✔Correct Answer-true
what is the minimum test pressure of a 0.5 psi gas system ✔Correct Answer-3
what must be provided when flame sensing detectors can fail in the flame proven mode ✔Correct
Answer-self checking feature
