Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: What type of pressure relief device is used on a CO2 system?
Rupture disk
Glove valve
Gate valve
Fusible plug
2: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
high pressure
low pressure
critical pressure
design pressure
3: What happens after your initial inspection of a pressure vessel?
Notify the Fire Marshal that the system has been inspected and approved
There is a temporary shut-down until a final inspection can be performed.
Inspector leaves a metal tag with a certification listed on it
Notify the AHJ to let them know that the system been inspected
4: What is an example of institutional occupancy?
Hospital
Football stadium
Dorms
Shopping mall
5: When an inspection is needed, how often must it be done?
annually
every 18 months
every 24 months
every 36 months
6: How are refrigerant blends classified?
Based on worst case fractionation
Based on the oil used
Blends don't have to be classified
Based on best case Fractionation
7: A hotel is considered a _______ occupancy.
residential
institutional
commercial
mercantile
8: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
True
False
9: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
institutional occupancy
commercial occupancy
public assembly occupancy
illegal occupancy
10: Liquid level gauges must be provided with what?
A relief valve
A low level mark
Automatic shut-offs
A red line
11: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
12: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
75%
100%
90%
80%
13: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
2.5, 3.0
3.0, 3.5
6.6, 6.6
2.5, 2.5
14: What refrigerant were phased out in 2004?
R-12
R-134a
R-11
R-22
15: A 3-cubic foot receiver must have what type of relief valve?
fusible plug
relief valve
rupture device
none of the above
16: A class A3 refrigerant is considered
non-toxic and non-flammable
non-toxic but highly flammable
toxic and non-flammable
toxic and somewhat flammable
17: What is not a requirement of a Class T machine room?
Fire hose connected to the building fire protection system.
Automatic ventilation
Tight fitting doors
Self-closing doors
18: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
compressor
boiler
evaporator
outside the machinery room
19: When should a relief valve start to function?
Before the purge station discharges
10 psi before it's set pressure
Two times it's working pressure
At it's set pressure
20: What is not a requirement of a class T machine room?
tight fitting doors
fire hose connection to the building fire protection system
automatic ventilation
self-closing doors
21: Each machinery room shall contain
smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
a refrigerant detector located in an area where the refrigerant from a leak will concentrate
high and low pressure controls
a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
22: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
36
48
24
18
23: What type of relief valve is used on low pressure centrifugal compressor systems?
Spring-loaded relief valve
Rupture disc
Purge relief
None of the above
24: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
25: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)