NATE A/C Exam #1 with verified answers
| | | | | |
Low |airflow |over |a |residential |split |system |air |conditioning |evaporator |can |cause
| A: |Liquid |flood-back |to |the |compressor |
| B: |A |decrease |in |compression |ratio |
| C: |An |increase |in |suction |line |superheat |
| D: |Oil |logging |in |the |evaporator |- |correct |answer |A: |Liquid |flood-back |to |the |compressor
Which |of |the |following |is |the |correct |sequence |of |work?
|A: |Attach |gauge |manifold, |recover |refrigerant, |replace |filter |core, |evacuate |the |system, |
recharge |the |system. |
| B: |Recover |refrigerant, |evacuate |the |system, |replace |filter |core, |recharge |the |system. |
|C: |Attach |gauge |manifold, |evacuate |the |system, |replace |filter |core, |recover |refrigerant, |
recharge |the |system. |
|D: |Attach |gauge |manifold, |recharge |the |system, |evacuate |the |system, |replace |filter |core. |- |
correct |answer |A: |Attach |gauge |manifold, |recover |refrigerant, |replace |filter |core, |evacuate |the |
system, |recharge |the |system.
As |the |pressure |on |a |liquid |is |increased, |the |vaporization |temperature |of |the |liquid
,| A: |Decreases |
| B: |Increases |
| C: |Remains |unchanged |
| D: |Varies |- |correct |answer |B: |Increases
An |oil |separator |must |be |mounted
| A: |Level |
| B: |Below |the |compressor |crankcase |
| C: |Above |the |compressor |crankcase |
| D: |In |the |suction |line |- |correct |answer |A: |Level
Which |of |the |following |metering |devices |controls |evaporator |pressure?
| A: |Thermostatic |expansion |valve |
| B: |Fixed |orifice |
| C: |Low |side |float |
| D: |None |of |these |- |correct |answer |D: |None |of |these
, An |automatic |expansion |valve |controls |evaporator |pressure.
The |purpose |of |the |external |equalizer |on |a |thermostatic |expansion |valve |is
| A: |To |equalize |evaporator |pressure |drop |with |respect |to |the |TEV |
| B: |To |equalize |the |evaporator |pressure |drop |
| C: |To |help |prevent |liquid |floodback |
|D: |To |allow |the |high |side |pressure |to |equalize |to |the |low |side |when |the |compressor |cycles |off
|- |correct |answer |A: |To |equalize |evaporator |pressure |drop |with |respect |to |the |TEV
The |higher |the |MERV |rating |of |a |filter-drier, |the
| A: |More |efficient |the |drier |at |absorbing |moisture |
| B: |Less |efficient |the |drier |at |absorbing |moisture |
| C: |Smaller |the |particles |the |filter |can |entrap |
|D: |MERV |does |not |apply |to |filter-driers |- |correct |answer |D: |MERV |does |not |apply |to |filter-
driers
Minimum |Efficiency |Reporting |Value |- |MERV |ratings |are |used |to |rate |the |ability |of |an |air |
conditioning |filter |to |remove |dust |from |the |air |as |it |passes |through |the |filter. |MERV |is |a |
standard |used |to |measure |the |overall |efficiency |of |a |filter. |Higher |MERV |ratings |mean |fewer |
dust |particles |and |other |airborne |contaminants |pass |through |the |filter. |Filters |with |a |merv |
rating |of |9 |to |12 |are |used |in |commercial |and |industrial |applications |and |will |stop |particles |in |
the |1 |to |3 |micron |range. |These |filters |are |a |great |choice |for |home |owners |who |want |the |best |
dust |control |possible. |When |using |filters |with |Merv |9 |ratings |and |above |it |is |important |to |
| | | | | |
Low |airflow |over |a |residential |split |system |air |conditioning |evaporator |can |cause
| A: |Liquid |flood-back |to |the |compressor |
| B: |A |decrease |in |compression |ratio |
| C: |An |increase |in |suction |line |superheat |
| D: |Oil |logging |in |the |evaporator |- |correct |answer |A: |Liquid |flood-back |to |the |compressor
Which |of |the |following |is |the |correct |sequence |of |work?
|A: |Attach |gauge |manifold, |recover |refrigerant, |replace |filter |core, |evacuate |the |system, |
recharge |the |system. |
| B: |Recover |refrigerant, |evacuate |the |system, |replace |filter |core, |recharge |the |system. |
|C: |Attach |gauge |manifold, |evacuate |the |system, |replace |filter |core, |recover |refrigerant, |
recharge |the |system. |
|D: |Attach |gauge |manifold, |recharge |the |system, |evacuate |the |system, |replace |filter |core. |- |
correct |answer |A: |Attach |gauge |manifold, |recover |refrigerant, |replace |filter |core, |evacuate |the |
system, |recharge |the |system.
As |the |pressure |on |a |liquid |is |increased, |the |vaporization |temperature |of |the |liquid
,| A: |Decreases |
| B: |Increases |
| C: |Remains |unchanged |
| D: |Varies |- |correct |answer |B: |Increases
An |oil |separator |must |be |mounted
| A: |Level |
| B: |Below |the |compressor |crankcase |
| C: |Above |the |compressor |crankcase |
| D: |In |the |suction |line |- |correct |answer |A: |Level
Which |of |the |following |metering |devices |controls |evaporator |pressure?
| A: |Thermostatic |expansion |valve |
| B: |Fixed |orifice |
| C: |Low |side |float |
| D: |None |of |these |- |correct |answer |D: |None |of |these
, An |automatic |expansion |valve |controls |evaporator |pressure.
The |purpose |of |the |external |equalizer |on |a |thermostatic |expansion |valve |is
| A: |To |equalize |evaporator |pressure |drop |with |respect |to |the |TEV |
| B: |To |equalize |the |evaporator |pressure |drop |
| C: |To |help |prevent |liquid |floodback |
|D: |To |allow |the |high |side |pressure |to |equalize |to |the |low |side |when |the |compressor |cycles |off
|- |correct |answer |A: |To |equalize |evaporator |pressure |drop |with |respect |to |the |TEV
The |higher |the |MERV |rating |of |a |filter-drier, |the
| A: |More |efficient |the |drier |at |absorbing |moisture |
| B: |Less |efficient |the |drier |at |absorbing |moisture |
| C: |Smaller |the |particles |the |filter |can |entrap |
|D: |MERV |does |not |apply |to |filter-driers |- |correct |answer |D: |MERV |does |not |apply |to |filter-
driers
Minimum |Efficiency |Reporting |Value |- |MERV |ratings |are |used |to |rate |the |ability |of |an |air |
conditioning |filter |to |remove |dust |from |the |air |as |it |passes |through |the |filter. |MERV |is |a |
standard |used |to |measure |the |overall |efficiency |of |a |filter. |Higher |MERV |ratings |mean |fewer |
dust |particles |and |other |airborne |contaminants |pass |through |the |filter. |Filters |with |a |merv |
rating |of |9 |to |12 |are |used |in |commercial |and |industrial |applications |and |will |stop |particles |in |
the |1 |to |3 |micron |range. |These |filters |are |a |great |choice |for |home |owners |who |want |the |best |
dust |control |possible. |When |using |filters |with |Merv |9 |ratings |and |above |it |is |important |to |
