NATE A/C EXAM #1 STUDY GUIDE LATEST VERSION /QUESTIONS AND
CORRECT ANSWERS / A GRADE SCORE SOLUTION COMPLETE
DOCUMENT FOR STUDY \\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
ANSWERS: A: Liquid flood-back to the compressor
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 clean or replace them when recommended by
the manufacturer because they will have a negative effect on air flow
when they become dirty. This can lead to performance problems and
,decreased operating efficiency. The most efficient filters have merv
ratings of 13 to 16 and will stop particles as small as .3 microns. These
filters are used in hospitals and other super clean environments.
Zeolite is used with
A: Refrigerant filter-driers
B: HEPA filters
C: Pipe threads
D: Solder
ANSWERS: A: Refrigerant filter-driers
Vacuum pressures are measured in
A: Microns
B: Millimeters of mercury
C: Inches of mercury
D: All of the above
ANSWERS: D: All of the above
The number 25,400 relates to
A: Microns/inch
B: Btu/ton
, C: Cfm/hp
D: Cfm/ton
ANSWERS: A: Microns/inch
The general rule of thumb for airflow is
A: 400 cfm/ton
B: 400 cfm/hp
C: 6 cfm/sq
D: 144 cfm/cu
ANSWERS: A: 400 cfm/ton
A double suction riser is used to
A: Help improve refrigerant return
B: Allow the compressor to pump at a greater capacity
C: Decrease suction line resistance
D: Improve oil return as system capacity changes
ANSWERS: D: Improve oil return as system capacity changes
A service technician measures a return air temperature of 80 degrees
and a supply air temperature of 55 degrees. What, if anything, may be
wrong with this air residential split system air conditioning unit?
CORRECT ANSWERS / A GRADE SCORE SOLUTION COMPLETE
DOCUMENT FOR STUDY \\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
ANSWERS: A: Liquid flood-back to the compressor
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 clean or replace them when recommended by
the manufacturer because they will have a negative effect on air flow
when they become dirty. This can lead to performance problems and
,decreased operating efficiency. The most efficient filters have merv
ratings of 13 to 16 and will stop particles as small as .3 microns. These
filters are used in hospitals and other super clean environments.
Zeolite is used with
A: Refrigerant filter-driers
B: HEPA filters
C: Pipe threads
D: Solder
ANSWERS: A: Refrigerant filter-driers
Vacuum pressures are measured in
A: Microns
B: Millimeters of mercury
C: Inches of mercury
D: All of the above
ANSWERS: D: All of the above
The number 25,400 relates to
A: Microns/inch
B: Btu/ton
, C: Cfm/hp
D: Cfm/ton
ANSWERS: A: Microns/inch
The general rule of thumb for airflow is
A: 400 cfm/ton
B: 400 cfm/hp
C: 6 cfm/sq
D: 144 cfm/cu
ANSWERS: A: 400 cfm/ton
A double suction riser is used to
A: Help improve refrigerant return
B: Allow the compressor to pump at a greater capacity
C: Decrease suction line resistance
D: Improve oil return as system capacity changes
ANSWERS: D: Improve oil return as system capacity changes
A service technician measures a return air temperature of 80 degrees
and a supply air temperature of 55 degrees. What, if anything, may be
wrong with this air residential split system air conditioning unit?
