Low airflow over a residential split system A: Liquid flood-back to the compressor
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
Which of the following is the correct A: Attach gauge manifold, recover refrigerant, replace filter
sequence of work? core, evacuate the system, recharge the system.
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.
As the pressure on a liquid is increased, B: Increases
the vaporization temperature of the liquid
A: Decreases
B: Increases
,C: Remains unchanged
D: Varies
An oil separator must be mounted A: Level
A: Level
B: Below the compressor crankcase
C: Above the compressor crankcase
D: In the suction line
Which of the following metering devices D: None of these
controls evaporator pressure?
An automatic expansion valve controls evaporator
A: Thermostatic expansion valve pressure.
B: Fixed orifice
C: Low side float
D: None of these
The purpose of the external equalizer on a A: To equalize evaporator pressure drop with respect to the
thermostatic expansion valve is TEV
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
, The higher the MERV rating of a filter- D: MERV does not apply to filter-driers
drier, the
Minimum Efficiency Reporting Value - MERV ratings are
A: More efficient the drier at absorbing used to rate the ability of an air conditioning filter to
moisture remove dust from the air as it passes through the filter.
MERV is a standard used to measure the overall efficiency
B: Less efficient the drier at absorbing of a filter. Higher MERV ratings mean fewer dust particles
moisture and other airborne contaminants pass through the filter.
Filters with a merv rating of 9 to 12 are used in commercial
C: Smaller the particles the filter can and industrial applications and will stop particles in the 1
entrap to 3 micron range. These filters are a great choice for home
owners who want the best dust control possible. When
D: MERV does not apply to filter-driers 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
A: Refrigerant filter-driers
B: HEPA filters
C: Pipe threads
D: Solder
Vacuum pressures are measured in D: All of the above
A: Microns
B: Millimeters of mercury
C: Inches of mercury
D: All of the above
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
Which of the following is the correct A: Attach gauge manifold, recover refrigerant, replace filter
sequence of work? core, evacuate the system, recharge the system.
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.
As the pressure on a liquid is increased, B: Increases
the vaporization temperature of the liquid
A: Decreases
B: Increases
,C: Remains unchanged
D: Varies
An oil separator must be mounted A: Level
A: Level
B: Below the compressor crankcase
C: Above the compressor crankcase
D: In the suction line
Which of the following metering devices D: None of these
controls evaporator pressure?
An automatic expansion valve controls evaporator
A: Thermostatic expansion valve pressure.
B: Fixed orifice
C: Low side float
D: None of these
The purpose of the external equalizer on a A: To equalize evaporator pressure drop with respect to the
thermostatic expansion valve is TEV
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
, The higher the MERV rating of a filter- D: MERV does not apply to filter-driers
drier, the
Minimum Efficiency Reporting Value - MERV ratings are
A: More efficient the drier at absorbing used to rate the ability of an air conditioning filter to
moisture remove dust from the air as it passes through the filter.
MERV is a standard used to measure the overall efficiency
B: Less efficient the drier at absorbing of a filter. Higher MERV ratings mean fewer dust particles
moisture and other airborne contaminants pass through the filter.
Filters with a merv rating of 9 to 12 are used in commercial
C: Smaller the particles the filter can and industrial applications and will stop particles in the 1
entrap to 3 micron range. These filters are a great choice for home
owners who want the best dust control possible. When
D: MERV does not apply to filter-driers 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
A: Refrigerant filter-driers
B: HEPA filters
C: Pipe threads
D: Solder
Vacuum pressures are measured in D: All of the above
A: Microns
B: Millimeters of mercury
C: Inches of mercury
D: All of the above
