Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
the owner shall be informed
no flames shall be permitted
explosion precautions must be taken
gas masks must be worn
2: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
550
100
350
50
3: A Low-Probability System
is such that a leak of refrigerant from a failed connection will enter the occupied space
is a system highly likely to leak form a failed connection or component of such system
is such that any leak will cause injury or death to anyone within a 100 square foot area
is such that a leak of refrigerant from a failed connection can not enter the occupied space
4: _____ and its alloys are suitable for use with ammonia systems.
Zinc
Copper
Magnesium
Aluminum
5: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
6: The discharge relief valve is located (9.4.6)
between the compressor and reciever
between the compressor and oil separator
on top of the condensor
between the compressor and the stop valve
7: What is the refrigerant dichlorodifluoromethane?
R-22
R-123
R-12
R-134A
8: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
24 volt secondary side of the Class 2 transformer to the thermostat
first disconnect in
load-side of the contactor in
breaker panel in
9: What type of pressure relief device is used on a CO2 system?
Glove valve
Rupture disk
Fusible plug
Gate valve
10: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
1.2
1
2.2
1.5
11: Single compound Refrigerants are classified by what two criteria?
Flammability and temperature range
Flammability and toxicity
Weight and color
Temperature range and hazardousness
12: When can recovered refrigerants be reused?
They can't
Only when used in original owner's equipment
Only if used in 30 days of recovery
None of the above
13: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
14: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
fusible plug
relief valve
rupture disc
all of the above
15: What is an example of institutional occupancy?
Dorms
Football stadium
Shopping mall
Hospital
16: Pipe identification labels are required when the system contains more than
110 lbs
55 lbs
120 lbs
65 lbs
17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
When it's cold out
When there is a malfunction on the high side
When its warm out
All of the above
18: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
UL and UR
UV or UR
UL and UM
UM or UL
19: An example of direct system is
rooftop unit
chiller
absorber
none of the above
20: Which refrigerant(s) is an HFC?
R-22
R-410A
R-502
All of the above
21: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
80
100
90
110
22: All serviceable components of a refrigeration system shall be provided with
name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
manufactures instructions on start-up procedures
service manuals
safe access
23: How many flammability classifications are refrigerants in?
3
5
2
7
24: A restaurant is classified as a
large mercantile occupancy
public assembly occupancy
commercial occupancy
mixed occupancy
25: Trichlorofluoromethane is the name of what refrigerant?