HVAC D2 License Test Questions and
Answers40
BTU is the abbreviation of ________________. it is the quantity of heat needed to raise the
temperature of 1 pound of water 1 degree. - ANSWERS -british thermal unit
what determines an oil burner rating - ANSWERS -nozzle size
how far off a crawl space floor as a minimum, must a duct be installed - ANSWERS -4
what is the color code of R-11 refrigerant - ANSWERS -orange
what is the minimum height off the floor that an oil fired appliance is to be suspended -
ANSWERS -6 inches
which is least compressible - ANSWERS -water
what is the minimum damper rating per hour for less than 3 hour fire resistance rated assembly
ie: a 2 hour fire wall - ANSWERS -1 1/2 hours
what is the maximum allowable misalignment that is not considered a miter - ANSWERS -3
degrees
Regarding heat pumps, suction line accumulators are used as what for excess refrigerant -
ANSWERS -receivers
,a gas meter must be located how many feet from the suction line - ANSWERS -3
what reduces the capacity of a refrigerant compressor - ANSWERS -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 -
ANSWERS -4%
what should the draft reading over the fire be for flame retention, residential oil burner -
ANSWERS -negative .02
what valve is set at the adjustable heat anticipator on a gas thermostat - ANSWERS -the amp
flow reading of the control circuit
which is not true of a water cooled chiller system - ANSWERS -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 - ANSWERS -explosion
the voltage to a residential thermostat - ANSWERS -24
how far from a fuel oil burner must an electrode panel be - ANSWERS -3'
regarding heat pumps, two ______ devices are used - ANSWERS -expansion
a ____ is a rigid connection that holds one scaffold member in a fixed position with respect to
another member, or building structure - ANSWERS -brace
,on a 208 volt meter the lowest allowable input voltage is - ANSWERS -187.2
what pressure is liquified petrolium gas fed to the burner - ANSWERS -11" Wc
in reference to cooling tower sump water, what is the ideal temp to test PH - ANSWERS -70-80 F
unloaders are used to balance the ______ on a run cycle - ANSWERS -load
T or F Copper water tube hydronic boilers has the lowest terminal mass per btu/hr - ANSWERS -
true
what is the max distance an ultraviolet scanner may be placed from the flame - ANSWERS -18
inches
what is the net free air in square inches of a 12" x 12" metal louver opening. (formula = total
area x 75%) - ANSWERS -108
hot gas bypass is used to _____ an evaporator coil - ANSWERS -defrost
what is an A type vent made of - ANSWERS -masonry
in a cascade refrigerating system two or more refrigerating systems are connected. One
evaporator coil cools the next _____ - ANSWERS -condenser
modern day residential oil burner motors operate at how many rpms - ANSWERS -3450
hard drawn copper tubing should not be - ANSWERS -bent
, a chimney for a residential low heat utilization equipment shall extend at least - ANSWERS -3
feet
What does M.A.W.P. stand for - ANSWERS -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 - ANSWERS -12 inches
what gauge of wire goes to an oil burner - ANSWERS -14 gauge
T or F An unbalanced duct can cause noise and vibration - ANSWERS -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 - ANSWERS -competent
to eliminate noise and vibration to critical rooms you should - ANSWERS -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 - ANSWERS -true
what is the maximum length of a horizontal chimney connector - ANSWERS -10 feet
_____ for ac and heat pumps can be temperature initiated/temperature terminated - ANSWERS
-defrost controls
Answers40
BTU is the abbreviation of ________________. it is the quantity of heat needed to raise the
temperature of 1 pound of water 1 degree. - ANSWERS -british thermal unit
what determines an oil burner rating - ANSWERS -nozzle size
how far off a crawl space floor as a minimum, must a duct be installed - ANSWERS -4
what is the color code of R-11 refrigerant - ANSWERS -orange
what is the minimum height off the floor that an oil fired appliance is to be suspended -
ANSWERS -6 inches
which is least compressible - ANSWERS -water
what is the minimum damper rating per hour for less than 3 hour fire resistance rated assembly
ie: a 2 hour fire wall - ANSWERS -1 1/2 hours
what is the maximum allowable misalignment that is not considered a miter - ANSWERS -3
degrees
Regarding heat pumps, suction line accumulators are used as what for excess refrigerant -
ANSWERS -receivers
,a gas meter must be located how many feet from the suction line - ANSWERS -3
what reduces the capacity of a refrigerant compressor - ANSWERS -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 -
ANSWERS -4%
what should the draft reading over the fire be for flame retention, residential oil burner -
ANSWERS -negative .02
what valve is set at the adjustable heat anticipator on a gas thermostat - ANSWERS -the amp
flow reading of the control circuit
which is not true of a water cooled chiller system - ANSWERS -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 - ANSWERS -explosion
the voltage to a residential thermostat - ANSWERS -24
how far from a fuel oil burner must an electrode panel be - ANSWERS -3'
regarding heat pumps, two ______ devices are used - ANSWERS -expansion
a ____ is a rigid connection that holds one scaffold member in a fixed position with respect to
another member, or building structure - ANSWERS -brace
,on a 208 volt meter the lowest allowable input voltage is - ANSWERS -187.2
what pressure is liquified petrolium gas fed to the burner - ANSWERS -11" Wc
in reference to cooling tower sump water, what is the ideal temp to test PH - ANSWERS -70-80 F
unloaders are used to balance the ______ on a run cycle - ANSWERS -load
T or F Copper water tube hydronic boilers has the lowest terminal mass per btu/hr - ANSWERS -
true
what is the max distance an ultraviolet scanner may be placed from the flame - ANSWERS -18
inches
what is the net free air in square inches of a 12" x 12" metal louver opening. (formula = total
area x 75%) - ANSWERS -108
hot gas bypass is used to _____ an evaporator coil - ANSWERS -defrost
what is an A type vent made of - ANSWERS -masonry
in a cascade refrigerating system two or more refrigerating systems are connected. One
evaporator coil cools the next _____ - ANSWERS -condenser
modern day residential oil burner motors operate at how many rpms - ANSWERS -3450
hard drawn copper tubing should not be - ANSWERS -bent
, a chimney for a residential low heat utilization equipment shall extend at least - ANSWERS -3
feet
What does M.A.W.P. stand for - ANSWERS -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 - ANSWERS -12 inches
what gauge of wire goes to an oil burner - ANSWERS -14 gauge
T or F An unbalanced duct can cause noise and vibration - ANSWERS -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 - ANSWERS -competent
to eliminate noise and vibration to critical rooms you should - ANSWERS -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 - ANSWERS -true
what is the maximum length of a horizontal chimney connector - ANSWERS -10 feet
_____ for ac and heat pumps can be temperature initiated/temperature terminated - ANSWERS
-defrost controls
