Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: How many different groups of refrigerants are there?
7
3
15
11
2: A relief valve discharge capacity is rated in
PSIA
temperature minus pounds of air per second divided by release rate squared
Pounds of air per minute.
PSIG
3: A relief valve shall be located at least ___ above grade.
15'
10'
25'
36'
4: A High-Probability System
is a system highly likely to leak form a failed connection or component of such system
is such that a leak of refrigerant from a failed connection will enter the occupied space
is such that a leak of refrigerant from a failed connection will enter an unoccupied space
is such that any leak will cause injury or death to anyone within a 100 square foot area
5: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
the vapor side of the system
low side of the system
the liquid side of the system
high side of the system
6: When a refrigerating machinery room is used, the emergency procedures shall be posted
on a conspicuous card located near the evaporator
outside the room, immediately adjacent to each door
on a conspicuous card located near the compressor
inside the room, immediately adjacent to each door
7: Relief valves are rated in
pounds of air per hour
gallons of water per minute
gallons of water per hour
pounds of air per minute
8: Lithium-bromide, Li-Br, is best characterized as a
salt
soil
sugar
sand
9: What is the boiling point of refrigerant governed by?
P&T relationship
Compressor RPM's
Evaporator temperature
Condenser sub-cooling
10: A hissing noise at the expansion valve is a good indication that
liquid is passing thru it
nothing is passing thru
expansion valve is oversized
gas is passing thru it
11: 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)
Pressure gauge
Temperature gauge
Sight glass gauge
All of the above
12: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
refrigerant sensing
phosgene gas sening
A group sensing
CO Sensing
13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
24
18
15
10
14: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
licensed technician
licensed welder
competent welder
welder qualified
15: 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.
90
80
100
110
16: What chemical in the refrigerant set off the leak detection alarm?
Fluorine
Chlorine
Both A and B
none of the above
17: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
55 lbs
330 lbs
500 lbs
660 lbs
18: How many CFMs are required per square foot of commercial office occupied space
15 CFM
.5 CFM
5 CFM
20 CFM
19: Humidity can be sensed with
human hair
bimetal
thermometer
pressure bellows
20: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
checking the level of refrigerant in the system
testing for oil in the system
testing for moisture in the system
none of the above
21: Machinery rooms must be vented to ______?
outdoors
neutralizing tank
unoccupied spaces
basement
22: The heat picked up in the evaporator must equal to
the heat gained by the condenser
the heat of compression
the heat giving by the condenser
the heat lost by the medium being cooled
23: The 522 CMR 9.00 has adopted for reference ASHRAE ____
10
15
25
III
24: Who is permitted to access a refrigeration machine room?
Contractors only
Any employee
Anyone, it's a completely safe area
Authorized persons only
25: When must refrigeration system covered by the code be inspected?