Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Ammonia belongs to Group
A-2
B-2
B-1
A-1
2: Refrigerant restricted in 2004 but used for transition for decades:
R-11
R-123
R-134A
R-22
3: R-22 falls under which safety classification?
A-2
A-1
B-2
B-1
4: What is a Category "M" fluid?
A typical refrigerant used on newer air conditioning and heat pump systems
Any fluid that exceeds 150 psig and has design temperatures over 366F
A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
5: A class B2 refrigerant is considered
non-toxic and highly flammable
toxic and non-flammable
toxic and somewhat flammable
non-toxic and non-flammable
6: A professional or office building would be considered what type of occupancy?
business
commercial
mercantile
public assembly
7: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
Class A machinery room
Class M machinery room
Class T machinery room
Class B machinery room
8: Low pressure systems have what kind of compressor?
Centrifugal
Rotary
Scroll
Reciprocating
9: What type of copper is not permitted on refrigeration systems?
Type K
Type N
Type L
Type M
10: The location of a thermal bulb of a TXV affects
subcooling
the amount of liquid in the condenser.
the amount of liquid returning to the compressor
the amount of liquid refrigerant in the evaporator
11: R-410A can segregate in the system or chemically change its composition due to a leak.
True
False
12: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
970 BTU
144 BTU
24,000 BTU
12,000 BTU
13: Increasing superheat will do what to your frost line?
Decrease
Could either increase or decrease depending on the load conditions
Nothing
Increasae
14: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
15
50
75
55
15: The proper location for an oil separator is between the
receiver and metering device
condenser and receiver
compressor and condenser
evaporator and compressor
16: How much refrigerant can be stored in a mechanical room outside of the system?
200
150
100
330
17: Which creates more of a heat load?
70% RH
50% RH
30% RH
90% RH
18: What does safe access mean?
Locked doors
A clear unobstructed path to the equipment and controls
Well-lit exit signs
OSHA approved
19: Secondary refrigerants are usually
water or brine
Prestone anti-freeze
expensive
alcohol
20: Suction valve unloaders afford an effective means of
evaporator control
capacity control
superheat control
refrigerant control
21: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
Nothing must be done
Place sign, check for leaks, and insulate suction line
you can never change refrigerants
Make sure its compatible, notify owner, and notify AHJ.
22: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“UV”
“UL”
“UM” and “UV”
“U” or “UM”
23: Who is permitted to access a refrigeration machine room?
Anyone, it's a completely safe area
Contractors only
Authorized persons only
Any employee
24: Bubbles in the liquid line sight glass could be caused by
leaking discharge valves in the compressor
overcharge of oil
plugged drier
bad low pressure switch
25: 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)