NATE Final Exam #1 Questions and Answers
Latest Update Already Graded A+
1.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 crank- shaft
2.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
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25
,3.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
4.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
5.ASHRAE Standard 34 deals with:
A: Carbon monoxide safety
levels B: Refrigerant quality
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, 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
Classifi- cation of Refrigerants".
•Class A signifies refrigerants for which toxicity has not been identified
at concen- trations less than or equal to 400 ppm;
•Class B signifies refrigerants for which there is evidence of toxicity at
concentra- tions 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.
6.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
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25
Latest Update Already Graded A+
1.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 crank- shaft
2.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
1/
25
,3.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
4.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
5.ASHRAE Standard 34 deals with:
A: Carbon monoxide safety
levels B: Refrigerant quality
2/
25
, 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
Classifi- cation of Refrigerants".
•Class A signifies refrigerants for which toxicity has not been identified
at concen- trations less than or equal to 400 ppm;
•Class B signifies refrigerants for which there is evidence of toxicity at
concentra- tions 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.
6.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
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25
