NATE Gas Heating Exam with correct answers.

NATE Gas Heating Exam with correct answers
| | | | | |




Since |1992, |the |United |States |Department |of |Energy |has |required |that |all |furnaces |sold |and |
installed |from |that |date |on |must |have |an |AFUE |of |no |less |than:



| A: |70%



| B: |75%



| C: |78%



| D: |80% |- |correct |answer |C: |78%



Many |pre-1992 |furnaces |have |efficiencies |around |_______.



| A: |10%



| B: |40%



| C: |60%



| D: |80% |- |correct |answer |C: |60%



Today, |furnaces |with |AFUE |ratings |greater |than |_____ |are |available.



| A: |85%

,| B: |90%



| C: |100%



| D: |110% |- |correct |answer |B: |90%



A |thermocouple |is |used |with:



| A: |Intermittent |pilot |systems



| B: |Direct |spark |ignition |systems



| C: |Glow |coil |ignition |systems



| D: |Standing |pilot |ignition |systems |- |correct |answer |D: |Standing |pilot |ignition |systems



The |purpose |of |the |gas |pressure |regulator |is |to:



| A: |Keep |the |color |of |the |flame |constant



| B: |Keep |the |high |limit |switch |from |tripping



| C: |Maintain |a |constant |gas |pressure |at |the |burner



|D: |Allow |the |gas |valve |to |operate |smoothly |and |accurately |- |correct |answer |C: |Maintain |a |
constant |gas |pressure |at |the |burner



The |instrument |used |to |measure |outlet |gas |pressure |is |the:

, | A: |Velometer



| B: |Anemometer



| C: |Monometer



| D: |Draft |gauge |- |correct |answer |C: |Monometer



The |regulator |on |a |natural |gas |furnace |should |be |adjusted |to |supply |_____ |inches |of |pressure |
at |the |burners.



| A: |11"



| B: |10"



| C: |3.5"



| D: |2" |- |correct |answer |C: |3.5"



Burning |one |cubic |foot |of |natural |gas |releases |approximately |_____ |btu.



| A: |800



| B: |1,050



| C: |12,000