Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: An example of direct system is
rooftop unit
chiller
absorber
none of the above
2: R-123 belongs to Group
B-1
B-3
A-3
B-2
3: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
the outdoors
the return air ducted system
the mechanical room housing the refrigeration system
Machinery rooms need not be vented
4: 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
5: R-717 is
ammonia
carbon dioxide
trichloromethane
water
6: What type of material can't be used on the outlet of a relief valve?
Stainless steel
PVC
Magnesium alloy
Copper
7: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
8'4"
7.25'
7.00'
9.00'
8: A declaration test is needed when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
9: R-410A is classified as a ____ refrigerant on the safety matrix.
B-1
A-1
A-2
B-2
10: What is not a requirement of a class T machine room?
automatic ventilation
tight fitting doors
fire hose connection to the building fire protection system
self-closing doors
11: Liquid level gauges must be provided with what?
A relief valve
A low level mark
Automatic shut-offs
A red line
12: What do you need to do when you install a new system?
Have it inspected
Insulate the suction line before you take a superheat reading
Document the superheat and subcooling reading
Add refrigerant
13: A pressure relief should be located at least _______ from windows and doors.
25'
20'
30'
15'
14: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
mixed occupancy
institutional occupancy
commercial occupancy
public assembly occupancy
15: 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
outside the machinery room
evaporator
16: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
CO Sensing
phosgene gas sening
A group sensing
refrigerant sensing
17: What type of pressure relief device is used on a CO2 system?
Gate valve
Fusible plug
Glove valve
Rupture disk
18: Industrial occupancy is
a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
Both a and b are correct
19: What refrigerant is an inorganic compound?
R-22
Ammonia
R-132A
R-410A
20: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
21: How many refrigerant classifications are there for toxicity?
5
3
2
1
22: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
public assembly occupancy.
commercial occupancy
business occupancy
mercantile occupancy
23: What section governs pressure vessels?
Section 8 ASHREA 15 ASME unfired
Section 1 ASHREA 15 ASME fired
Section ASHREA 34
OSHA
24: Relief valves are rated in
pounds of air per minute
gallons of water per hour
pounds of air per hour
gallons of water per minute
25: Where are the three places that the discharge from an ammonia relief valve be piped?
atmosphere, tank containing water, where the A.H.J. indicates