NATE Final Exam #1 – Questions / Solutions
Generally, vibration eliminators in piping should be installed:
A: At a 45 degree angle
B: At a 90 degree angle
C: Perpendicular to the compressor crankshaft
D: Parallel to the compressor crankshaft ✔️Ans - D: Parallel to the
compressor crankshaft
If you purchased ten filter-driers for $100.00, what was the price of each
filter-drier?
A: $100.00
B: $10.00
C: $1.00
D: $1.10 ✔️Ans - B: $10.00
Which of the following jobs requires safety glasses?
A: Driving a vehicle
B: Extending a ladder
C: Brazing
D: Pulling thermostat wire ✔️Ans - C: Brazing
Which of the following instruments would typically be used to measure a
vacuum?
A: Micron gauge
, B: Thermostat
C: Anemometer
D: Differential pressure gauge ✔️Ans - A: Micron gauge
ASHRAE Standard 34 deals with:
A: Carbon monoxide safety levels
B: Refrigerant quality
C: Equipment room ventilation and alarms
D: Refrigerant toxicity and flammability ✔️Ans - D: Refrigerant toxicity
and flammability
ANSI/ASHRAE 34 published in 2001 and entitled "Designation and Safety
Classification of Refrigerants".
• Class A signifies refrigerants for which toxicity has not been identified at
concentrations less than or equal to 400 ppm;
• Class B signifies refrigerants for which there is evidence of toxicity at
concentrations below 400 ppm.
• Class 1 indicates refrigerants that do not show flame propagation when
tested in air at 21°C and 101 kPa;
• Class 2 indicates refrigerants having a lower flammability limit of more than
0.10 kg/m3 at 21°C and 101 kPa and a heat of combustion of less than 19
kJ/kg;
• Class 3 indicates refrigerants that are highly flammable as defined by a
lower flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101
kPa or a heat of combustion greater than or equal to 19 kJ/kg.
What control would you use on a capillary tube or automatic expansion valve
system to maintain the desired temperature?
A: Dual pressure control
B: High pressure control
Generally, vibration eliminators in piping should be installed:
A: At a 45 degree angle
B: At a 90 degree angle
C: Perpendicular to the compressor crankshaft
D: Parallel to the compressor crankshaft ✔️Ans - D: Parallel to the
compressor crankshaft
If you purchased ten filter-driers for $100.00, what was the price of each
filter-drier?
A: $100.00
B: $10.00
C: $1.00
D: $1.10 ✔️Ans - B: $10.00
Which of the following jobs requires safety glasses?
A: Driving a vehicle
B: Extending a ladder
C: Brazing
D: Pulling thermostat wire ✔️Ans - C: Brazing
Which of the following instruments would typically be used to measure a
vacuum?
A: Micron gauge
, B: Thermostat
C: Anemometer
D: Differential pressure gauge ✔️Ans - A: Micron gauge
ASHRAE Standard 34 deals with:
A: Carbon monoxide safety levels
B: Refrigerant quality
C: Equipment room ventilation and alarms
D: Refrigerant toxicity and flammability ✔️Ans - D: Refrigerant toxicity
and flammability
ANSI/ASHRAE 34 published in 2001 and entitled "Designation and Safety
Classification of Refrigerants".
• Class A signifies refrigerants for which toxicity has not been identified at
concentrations less than or equal to 400 ppm;
• Class B signifies refrigerants for which there is evidence of toxicity at
concentrations below 400 ppm.
• Class 1 indicates refrigerants that do not show flame propagation when
tested in air at 21°C and 101 kPa;
• Class 2 indicates refrigerants having a lower flammability limit of more than
0.10 kg/m3 at 21°C and 101 kPa and a heat of combustion of less than 19
kJ/kg;
• Class 3 indicates refrigerants that are highly flammable as defined by a
lower flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101
kPa or a heat of combustion greater than or equal to 19 kJ/kg.
What control would you use on a capillary tube or automatic expansion valve
system to maintain the desired temperature?
A: Dual pressure control
B: High pressure control
