Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: When should a relief valve start to function?
Two times it's working pressure
At it's set pressure
Before the purge station discharges
10 psi before it's set pressure
2: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
22
18
33
50
3: R-11 belongs to Group
B-1
A-2
B-3
A-1
4: Pressure vessels having an inside diameter of 6” or less shall be protected by
a fusible plug
a pressure relief device
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
either a fusible plug or a pressure relief device
5: Low temperature systems should have what?
High pour point
Low pour point
High viscosity
None of the above
6: Which refrigerant class listed below is the most flammable?
A2
C3
A3
B2
7: All electrical work done on refrigeration systems must comply with
NEC and Massachusetts Modifications
OSHA
ASHREA-15 Section 9.2.1
Department of Energy
8: Most CFC's are
inert but toxic
inert
flammable
toxic
9: Halogen refrigerants are corrosive to which type of metal?
magnesium
black iron
copper
stainless steel
10: An example of direct system is
rooftop unit
chiller
absorber
none of the above
11: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
gas masks must be worn
explosion precautions must be taken
the owner shall be informed
no flames shall be permitted
12: What refrigerant doesn't have to be classifted?
R-134a
R-718
R-717
R-711
13: The Department that certifies the transportation of refrigerant is the
RSES
DOT
EPA
EPO
14: A restaurant is classified as a
large mercantile occupancy
public assembly occupancy
mixed occupancy
commercial occupancy
15: What type of material can't be used on the outlet of a relief valve?
Stainless steel
PVC
Magnesium alloy
Copper
16: No open flames are allowed in the machinery room unless?
Approved by the authorized person
Only when combustion air is provided from outside of the machinery room
Never can be allowed
Approved by the installing contractor
17: 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
18: 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
first disconnect in
breaker panel in
load-side of the contactor in
24 volt secondary side of the Class 2 transformer to the thermostat
19: What is Trichlorotrifluoromethane?
R-13
R-11
R-12
R-113
20: 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
21: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
1.5
2.2
1
1.2
22: Who authorizes changes to the safety codes?
Person in charge of the facility
Contractor who last serviced the system.
Board of Boilers
Person who pulled the permit
23: Indirect systems using Group II refrigerants
shall be used in refrigeration system in excess of 1,000 lbs
shall be used in refrigeration system less than 1,000 lbs
shall have all refrigerant containing parts except piping, installed in a Class T machine room
shall be used for mechanical equipment only
24: 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.