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EPA Section 608 Technician Certification Study Guide questions with answers
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EPA Section 608 Technician Certification Study Guide questions with answers
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EPA Section 608 Technician CertificationStudy Guide questions with answers
What |are |the |typical |uses |of |the |center |port |of |gauge |set? |- |ANSWERS✔✔
|Used |during |evacuation, |charging |and |recovery |procedures.
What |color |are |the |gauges |on |a |manifold |gauge |set? |- |ANSWERS✔✔ |Low
|pressure |is |blue, |High |pressure |is |red.
What |are |the |typical |ranges |of |pressure |measurements |used |on |the |gauges |of
|a |manifold |gauge |set? |- |ANSWERS✔✔ |High |side |is |0 |to |500 |PSIG; |Low |side |is
|0 |to |350 |PSIG |and |0 |to |30 |in. |Hg |below |atmospheric |pressure.
Is |the |refrigerant |leaving |a |condenser |at |a |high |or |low |pressure? |Is |it |a |liquid
|or |a |gas? |- |ANSWERS✔✔ |High |pressure, |liquid.
Is |the |refrigerant |entering |the |expansion |valve |(variable |metering |device) |a
|liquid |or |gas? |- |ANSWERS✔✔ |Liquid, |high |pressure.
Is |the |pressure |of |the |refrigerant |entering |the |compressor |high |or |low? |-
|ANSWERS✔✔ |Low |pressure |vapor.
Where |in |a |refrigerant |circuit |does |a |liquid |boil |to |absorb |heat? |-
|ANSWERS✔✔ |In |the |evaporator.
The |refrigerant |in |the |suction |line |is |a |gas |that |has |been |heated |above |its
|saturation. |What |is |this |condition |called? |- |ANSWERS✔✔ |Superheated |vapor.
,What |can |cause |liquid |refrigerant |to |migrate |to |a |compressor |crankcase? |-
|ANSWERS✔✔ |If |the |compressor |is |located |in |the |coldest |location |in |the
|circuit.
List |two |conditions |that |can |quickly |damage |a |compressor |that |is |starting |to
|run? |- |ANSWERS✔✔ |Operating |while |in |a |deep |vacuum |or |when |the |service
|valves |are |closed.
What |system |failures |require |taking |an |oil |sample? |- |ANSWERS✔✔ |A
|compressor |burnout |or |if |the |unit |has |had |a |leak.
Is |flushing |with |refrigerant |an |acceptable |tube |cleaning |method? |-
|ANSWERS✔✔ |No.
In |addition |to |preventing |and |repairing |leaks |what |else |should |a |technician |do
|to |conserve |refrigerant? |- |ANSWERS✔✔ |Recover |and |recycle |used
|refrigerants.
What |factors |affect |the |speed |of |an |evacuation? |- |ANSWERS✔✔ |Pump |size,
|hose |length, |hose |diameter, |size |of |system |to |be |evacuated, |ambient
|temperature, |suction |line |size, |and |the |amount |of |moisture |in |the |system.
How |should |gauge |set |hoses |be |sized |for |use |in |evacuating |a |system? |-
|ANSWERS✔✔ |Use |the |shortest |length |and |the |largest |diameter |possible |for
|the |quickest |evacuation. |At |least |as |large |as |the |vacuum |pump |inlet.
When |evacuating |what |is |the |benefit |of |using |short |hoses |with |large
|diameters? |- |ANSWERS✔✔ |Reduces |emissions, |pressure |drop |and |evacuation
|time.
Which |connection |determines |the |preferred |size |of |hoses |used |with |a |vacuum
|pump? |- |ANSWERS✔✔ |The |vacuum |pump |inlet.
,As |the |capacity |and |suction |hose |size |increase |what |happens |to |the |time
|needed |for |an |evacuation? |- |ANSWERS✔✔ |Time |is |reduced.
What |purpose |is |served |by |heating |a |system |during |dehydration? |-
|ANSWERS✔✔ |To |speed |up |moisture |removal.
Does |a |thorough |evacuation |remove |moisture |from |a |system? |- |ANSWERS✔✔
|Yes.
What |can |happen |to |oil |in |the |compressor |if |the |moisture |is |left |in |an
|operating |system? |- |ANSWERS✔✔ |The |oil |will |form |hydrofluoric |and
|hydrochloric |acids |which |will |corrode |the |internal |parts |of |the |system.
What |is |the |result |of |over-evacuating |a |system? |- |ANSWERS✔✔ |No |damage
|will |be |done.
How |can |a |system |be |leak |checked |using |a |low |pressure |gauge? |-
|ANSWERS✔✔ |Vacuum |reading |will |rise |when |vacuum |pump |is |turned |off.
How |close |should |the |vacuum |gauge |be |connected |to |the |vacuum |pump
|during |evacuation? |- |ANSWERS✔✔ |As |far |away |as |possible.
When |measuring |the |vacuum |of |a |system |being |evacuated |the |system |must
|be |isolated. |What |must |be |done |to |the |vacuum |pump? |- |ANSWERS✔✔ |Turn
|it |off |and |valve |it |off.
What |is |ozone? |- |ANSWERS✔✔ |3 |atoms |of |oxygen. |It |blocks |much |of |the
|harmful |ultraviolet |radiation |(uv-b) |emitted |from |the |sun |and |it |keeps |our
|earth's |temperature |stable.
, How |much |ozone |can |a |chlorine |atom |destroy |in |the |stratosphere? |-
|ANSWERS✔✔ |One |atom |can |destroy |100,000 |ozone |molecules.
What |is |Ozone |Depletion |Potential |(ODP)? |- |ANSWERS✔✔ |The |ability |of |any
|chemical |to |deplete |the |ozone |layer.
What |is |CFC? |- |ANSWERS✔✔ |Chlorofluorocarbon.
Which |refrigerants |are |CFC's? |- |ANSWERS✔✔ |R-11,12,113,114.
Which |chemical |in |the |CFC |refrigerants |does |the |most |damage |to |the |ozone
|layer? |- |ANSWERS✔✔ |Chlorine.
What |is |an |HCFC? |- |ANSWERS✔✔ |Hydrochlorofluorocarbons.
Which |refrigerants |are |HCFC's? |- |ANSWERS✔✔ |R-22,123.
Which |is |more |harmful |to |the |ozone |layer |a |CFC |or |an |HCFC? |- |ANSWERS✔✔
|CFC's.
What |is |it |about |CFC's |that |make |them |more |harmful |to |the |stratosphere? |-
|ANSWERS✔✔ |Chemical |strength, |they |will |not |breakdown |in |the |lower
|atmosphere.
What |is |an |HFC? |- |ANSWERS✔✔ |A |fluorocarbon |that |contains |no |chlorine.
Which |refrigerants |are |HFC's? |- |ANSWERS✔✔ |R-134a,404a,407c,410a.
What |is |the |ODP |of |the |HFC |refrigerant? |- |ANSWERS✔✔ |Zero.
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