Nate Air-To-Air Heat Pump Practice Test 2 With All
Correct & 100% Verified Answers |Already Graded A+
A good evacuation of a refrigerant circuit to remove non-condensable will help ensure: ✔Correct
Answer-Higher efficiency and Capacity.
A condensing unit should be mounted on a slab that is level to allow: ✔Correct Answer-
Accumulated water to evenly run from the cabin.
Low airflow over a residential split system air conditioning evaporator can cause: ✔Correct
Answer-Liquid flood-back to the compressor.
Which of the following is the correct sequence of work: ✔Correct Answer-Attach the gauge
manifold, recover refrigerant, replace the filter core, evacuate the system, recharge the system.
As the pressure on the liquid is increased, the vaporization temperature of the liquid: ✔Correct
Answer-Increases.
An oil-separator must be mounted: ✔Correct Answer-Level.
Which of the following metering devices controls evaporator pressure: ✔Correct Answer-None of
these.
The purpose of the external equalizer on the thermostatic expansion valve is: ✔Correct Answer-To
equalize evaporator pressure drop with respect to the TEV.
The higher the MERV rating of a filter-drier, the: ✔Correct Answer-MERV does not apply to filter-
driers.
Zeolite is used with: ✔Correct Answer-Refrigerant filter driers.
Vacuum pressures are measured in: ✔Correct Answer-Microns, Millimeters or Inches of mercury.
The number 25,400 relates to: ✔Correct Answer-Microns/Inch.
A general rule of thumb for airflow: ✔Correct Answer-400 CFM/Ton.
A double suction riser is used to: ✔Correct Answer-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 Answer-Low airflow through evaporator.
The normal compression ratio for a typical comfort air conditioning application should be in the
range of: ✔Correct Answer-2.75 to 3.75.
All else being normal, if a system shows a high, low-side superheat with higher condenser sub-
cooling, what is the most likely problem? ✔Correct Answer-A partial refrigerant restriction.
, All else being normal, if a system shows a low, low-side super heat with a high condenser sub-
cooling, what is the likely problem? ✔Correct Answer-Refrigerant overcharge.
All else being normal, if a system shows a high, low-side superheat with low condenser sub cooling,
what is most likely the problem? ✔Correct Answer-Refrigerant undercharge.
A grille equipped with a damper control is called: ✔Correct Answer-Register.
A pressure relief valve is... ✔Correct Answer-Direct pressure acting.
A parallel compressor system in which both the crankcase oil level and refrigerant gas pressure are
equalized is a: ✔Correct Answer-Double pipe crankcase equalizer system.
In a direct expansion chiller used on air conditioning applications, the refrigerant is on what side of
the tubes? ✔Correct Answer-Inside of the tubes.
The total minimum open area for air to flow through on a supply air register is called: ✔Correct
Answer-Free area.
Which type of copper tubing has the thickest wall? ✔Correct Answer-Type K.
What is the gross weight of a refrigerant cylinder? ✔Correct Answer-The weight of the cylinder
plus the weight of the refrigerant.
What does an anemometer measure? ✔Correct Answer-Feet (time is a separate operation,
automated for your convenience).
The term induced draft most likely referes to... ✔Correct Answer-A type of cooling tower.
What fitting should be used to connect 1/4" copper tuning to a 1/4" internal pipe thread opening on
a compressor crankcase? ✔Correct Answer-Half-union.
Which compressor has the fewest moving parts? ✔Correct Answer-Scroll.
A hot liquid-line with a low to normal high side pressure is an indication of: ✔Correct Answer-An
undercharged system.
Air and water are directed counter-flow so as to: ✔Correct Answer-Gain the greatest amount of
heat transfer.
What is not a mechanical cooling system? ✔Correct Answer-Evaporative cooling.
A compressor is short cycling, which of the following would not be the cause? ✔Correct Answer-
Leaking compressor suction valve.
The position of the valve stem on the suction service valve is normally: ✔Correct Answer-Fully
back-seated.
OF the three fundamental fan laws, one states that the power varies by the ___ of the speed.
✔Correct Answer-Cube.
Correct & 100% Verified Answers |Already Graded A+
A good evacuation of a refrigerant circuit to remove non-condensable will help ensure: ✔Correct
Answer-Higher efficiency and Capacity.
A condensing unit should be mounted on a slab that is level to allow: ✔Correct Answer-
Accumulated water to evenly run from the cabin.
Low airflow over a residential split system air conditioning evaporator can cause: ✔Correct
Answer-Liquid flood-back to the compressor.
Which of the following is the correct sequence of work: ✔Correct Answer-Attach the gauge
manifold, recover refrigerant, replace the filter core, evacuate the system, recharge the system.
As the pressure on the liquid is increased, the vaporization temperature of the liquid: ✔Correct
Answer-Increases.
An oil-separator must be mounted: ✔Correct Answer-Level.
Which of the following metering devices controls evaporator pressure: ✔Correct Answer-None of
these.
The purpose of the external equalizer on the thermostatic expansion valve is: ✔Correct Answer-To
equalize evaporator pressure drop with respect to the TEV.
The higher the MERV rating of a filter-drier, the: ✔Correct Answer-MERV does not apply to filter-
driers.
Zeolite is used with: ✔Correct Answer-Refrigerant filter driers.
Vacuum pressures are measured in: ✔Correct Answer-Microns, Millimeters or Inches of mercury.
The number 25,400 relates to: ✔Correct Answer-Microns/Inch.
A general rule of thumb for airflow: ✔Correct Answer-400 CFM/Ton.
A double suction riser is used to: ✔Correct Answer-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 Answer-Low airflow through evaporator.
The normal compression ratio for a typical comfort air conditioning application should be in the
range of: ✔Correct Answer-2.75 to 3.75.
All else being normal, if a system shows a high, low-side superheat with higher condenser sub-
cooling, what is the most likely problem? ✔Correct Answer-A partial refrigerant restriction.
, All else being normal, if a system shows a low, low-side super heat with a high condenser sub-
cooling, what is the likely problem? ✔Correct Answer-Refrigerant overcharge.
All else being normal, if a system shows a high, low-side superheat with low condenser sub cooling,
what is most likely the problem? ✔Correct Answer-Refrigerant undercharge.
A grille equipped with a damper control is called: ✔Correct Answer-Register.
A pressure relief valve is... ✔Correct Answer-Direct pressure acting.
A parallel compressor system in which both the crankcase oil level and refrigerant gas pressure are
equalized is a: ✔Correct Answer-Double pipe crankcase equalizer system.
In a direct expansion chiller used on air conditioning applications, the refrigerant is on what side of
the tubes? ✔Correct Answer-Inside of the tubes.
The total minimum open area for air to flow through on a supply air register is called: ✔Correct
Answer-Free area.
Which type of copper tubing has the thickest wall? ✔Correct Answer-Type K.
What is the gross weight of a refrigerant cylinder? ✔Correct Answer-The weight of the cylinder
plus the weight of the refrigerant.
What does an anemometer measure? ✔Correct Answer-Feet (time is a separate operation,
automated for your convenience).
The term induced draft most likely referes to... ✔Correct Answer-A type of cooling tower.
What fitting should be used to connect 1/4" copper tuning to a 1/4" internal pipe thread opening on
a compressor crankcase? ✔Correct Answer-Half-union.
Which compressor has the fewest moving parts? ✔Correct Answer-Scroll.
A hot liquid-line with a low to normal high side pressure is an indication of: ✔Correct Answer-An
undercharged system.
Air and water are directed counter-flow so as to: ✔Correct Answer-Gain the greatest amount of
heat transfer.
What is not a mechanical cooling system? ✔Correct Answer-Evaporative cooling.
A compressor is short cycling, which of the following would not be the cause? ✔Correct Answer-
Leaking compressor suction valve.
The position of the valve stem on the suction service valve is normally: ✔Correct Answer-Fully
back-seated.
OF the three fundamental fan laws, one states that the power varies by the ___ of the speed.
✔Correct Answer-Cube.
