hvacr gas heating ESCO 2025 EXAM questions with
Correct Verified Answers
using an ohmmeter, there is 120 VAC between high speed and ground wires, this
indicates - ANS open
if temperature rise is too high... - ANS increase fan speed
how many of the 3 OSHA conditions defining confined spaces must be met - ANS all 3
what causes the temperature limit safety switch to shut off the burner - ANS fan motor
failure
flashback indicates - ANS the gas is flowing slower than the speed at which burn is
occurring
what type of connector is used to control noise in ductwork - ANS vibration eliminators
if the main burner lights and after a minute the blower fan comes on but the burner
flames waver in one corner... - ANS there is faulty blower housing
a burner orifice... - ANS meters gas to the burner
when lockout/tagout is used - ANS there should be 1 key kept by the electrician
the gas pressure is usually - ANS 3.5
, a spark igniter operates at - ANS 7,500 vac
a good thermocouple produces - ANS 30 millivolts
what must be present for combustion - ANS air, fuel and ignition source
the innerds of a type b vent is made of - ANS aluminium
the outsides of a type b vent is made of - ANS galvanized steel
one cubic foot of liquified petroleum produces,,, - ANS 2000- 2500 btu
the highest concentration of fuel that ignites is the - ANS UEL
the first section of duct installed that connects to the furnace is the - ANS plenum
the top of a ladder should extend - ANS 3 feet
how much current goes thru the flame sensor? - ANS 1-10 microamps
to change cubic feet per minute delivered to a single speed belt driven blower, you
should adjust - ANS the motor pulley size
nitrogen combines with oxygen to form... - ANS NOX
Correct Verified Answers
using an ohmmeter, there is 120 VAC between high speed and ground wires, this
indicates - ANS open
if temperature rise is too high... - ANS increase fan speed
how many of the 3 OSHA conditions defining confined spaces must be met - ANS all 3
what causes the temperature limit safety switch to shut off the burner - ANS fan motor
failure
flashback indicates - ANS the gas is flowing slower than the speed at which burn is
occurring
what type of connector is used to control noise in ductwork - ANS vibration eliminators
if the main burner lights and after a minute the blower fan comes on but the burner
flames waver in one corner... - ANS there is faulty blower housing
a burner orifice... - ANS meters gas to the burner
when lockout/tagout is used - ANS there should be 1 key kept by the electrician
the gas pressure is usually - ANS 3.5
, a spark igniter operates at - ANS 7,500 vac
a good thermocouple produces - ANS 30 millivolts
what must be present for combustion - ANS air, fuel and ignition source
the innerds of a type b vent is made of - ANS aluminium
the outsides of a type b vent is made of - ANS galvanized steel
one cubic foot of liquified petroleum produces,,, - ANS 2000- 2500 btu
the highest concentration of fuel that ignites is the - ANS UEL
the first section of duct installed that connects to the furnace is the - ANS plenum
the top of a ladder should extend - ANS 3 feet
how much current goes thru the flame sensor? - ANS 1-10 microamps
to change cubic feet per minute delivered to a single speed belt driven blower, you
should adjust - ANS the motor pulley size
nitrogen combines with oxygen to form... - ANS NOX
